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1. Benchmarking the design of the cryogenics system for the underground argon in DarkSide-20k

Author: Collaboration, DarkSide-20k, Acerbi, F., Adhikari, P., Agnes, P., Ahmad, I., Albergo, S., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Amaudruz, P., Angiolilli, M., Aprile, E., Ardito, R., Corona, M. Atzori, Auty, D. J., Ave, M., Avetisov, I. C., Azzolini, O., Back, H. O., Balmforth, Z., Olmedo, A. Barrado, Barrillon, P., Batignani, G., Bhowmick, P., Blua, S., Bocci, V., Bonivento, W., Bottino, B., Boulay, M. G., Buchowicz, A., Bussino, S., Busto, J., Cadeddu, M., Cadoni, M., Calabrese, R., Camillo, V., Caminata, A., Canci, N., Capra, A., Caravati, M., Cárdenas-Montes, M., Cargioli, N., Carlini, M., Castellani, A., Castello, P., Cavalcante, P., Cebrian, S., Ruiz, J. Cela, Chashin, S., Chepurnov, A., Cifarelli, L., Cintas, D., Citterio, M., Cleveland, B., Coadou, Y., Cocco, V., Colaiuda, D., Vilda, E. Conde, Consiglio, L., Costa, B. S., Czubak, M., D'Aniello, M., D'Auria, S., Rolo, M. D. Da Rocha, Darbo, G., Davini, S., De Cecco, S., De Guido, G., Dellacasa, G., Derbin, A. V., Devoto, A., Di Capua, F., Di Ludovico, A., Di Noto, L., Di Stefano, P., Dias, L. K., Mairena, D. Díaz, Ding, X., Dionisi, C., Dolganov, G., Dordei, F., Dronik, V., Elersich, A., Ellingwood, E., Erjavec, T., Diaz, M. Fernandez, Ficorella, A., Fiorillo, G., Franchini, P., Franco, D., Gatti, H. Frandini, Frolov, E., Gabriele, F., Gahan, D., Galbiati, C., Galiński, G., Gallina, G., Gallus, G., Garbini, M., Abia, P. Garcia, Gawdzik, A., Gendotti, A., Ghisi, A., Giovanetti, G. K., Casanueva, V. Goicoechea, Gola, A., Grandi, L., Grauso, G., di Cortona, G. Grilli, Grobov, A., Gromov, M., Guerzoni, M., Gulino, M., Guo, C., Hackett, B. R., Hallin, A., Hamer, A., Haranczyk, M., Harrop, B., Hessel, T., Hill, S., Horikawa, S., Hu, J., Hubaut, F., Hucker, J., Hugues, T., Hungerford, E. V., Ianni, A., Ippolito, V., Jamil, A., Jillings, C., Jois, S., Kachru, P., Keloth, R., Kemmerich, N., Kemp, A., Kendziora, C. L., Kimura, M., Kish, A., Kondo, K., Korga, G., Kotsiopoulou, L., Koulosousas, S., Kubankin, A., Kunzé, P., Kuss, M., Kuźniak, M., Kuzwa, M., La Commara, M., Lai, M., Guirriec, E. Le, Leason, E., Leoni, A., Lidey, L., Lissia, M., Luzzi, L., Lychagina, O., Macfadyen, O., Machulin, I. N., Manecki, S., Manthos, I., Mapelli, L., Marasciulli, A., Mari, S. M., Mariani, C., Maricic, J., Martinez, M., Martoff, C. J., Matteucci, G., Mavrokoridis, K., McDonald, A. B., Mclaughlin, J., Merzi, S., Messina, A., Milincic, R., Minutoli, S., Mitra, A., Moharana, A., Moioli, S., Monroe, J., Moretti, E., Morrocchi, M., Mroz, T., Muratova, V. N., Murphy, M., Murra, M., Muscas, C., Musico, P., Nania, R., Nessi, M., Nieradka, G., Nikolopoulos, K., Nikoloudaki, E., Nowak, J., Olchanski, K., Oleinik, A., Oleynikov, V., Organtini, P., de Solórzano, A. Ortiz, Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Papi, D., Pastuszak, G., Paternoster, G., Peck, A., Pegoraro, P. A., Pelczar, K., Pellegrini, L. A., Perez, R., Perotti, F., Pesudo, V., Piacentini, S. I., Pino, N., Plante, G., Pocar, A., Poehlmann, M., Pordes, S., Pralavorio, P., Price, D., Puglia, S., Bazetto, M. Queiroga, Ragusa, F., Ramachers, Y., Ramirez, A., Ravinthiran, S., Razeti, M., Renshaw, A. L., Rescigno, M., Retiere, F., Rignanese, L. P., Rivetti, A., Roberts, A., Roberts, C., Rogers, G., Romero, L., Rossi, M., Rubbia, A., Rudik, D., Sabia, M., Salomone, P., Samoylov, O., Sandford, E., Sanfilippo, S., Santone, D., Santorelli, R., Santos, E. M., Savarese, C., Scapparone, E., Schillaci, G., Schuckman II, F. G., Scioli, G., Semenov, D. A., Shalamova, V., Sheshukov, A., Simeone, M., Skensved, P., Skorokhvatov, M. D., Smirnov, O., Smirnova, T., Smith, B., Sotnikov, A., Spadoni, F., Spangenberg, M., Stefanizzi, R., Steri, A., Stornelli, V., Stracka, S., Sulis, S., Sung, A., Sunny, C., Suvorov, Y., Szelc, A. M., Taborda, O., Tartaglia, R., Taylor, A., Taylor, J., Tedesco, S., Testera, G., Thieme, K., Thompson, A., Thorpe, T. N., Tonazzo, A., Torres-Lara, S., Tricomi, A., Unzhakov, E. V., Vallivilayil, T. J., Van Uffelen, M., Velazquez-Fernandez, L., Viant, T., Viel, S., Vishneva, A., Vogelaar, R. B., Vossebeld, J., Vyas, B., Wada, M., Walczak, M. B., Wang, H., Wang, Y., Westerdale, S., Williams, L., Wojaczyński, R., Wojcik, M., Wojcik, M. M., Wright, T., Xiao, X., Xie, Y., Yang, C., Yin, J., Zabihi, A., Zakhary, P., Zani, A., Zhang, Y., Zhu, T., Zichichi, A., Zuzel, G., and Zykova, M. P.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: DarkSide-20k (DS-20k) is a dark matter detection experiment under construction at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It utilises ~100 t of low radioactivity argon from an underground source (UAr) in its inner detector, with half serving as target in a dual-phase time projection chamber (TPC). The UAr cryogenics system must maintain stable thermodynamic conditions throughout the experiment's lifetime of >10 years. Continuous removal of impurities and radon from the UAr is essential for maximising signal yield and mitigating background. We are developing an efficient and powerful cryogenics system with a gas purification loop with a target circulation rate of 1000 slpm. Central to its design is a condenser operated with liquid nitrogen which is paired with a gas heat exchanger cascade, delivering a combined cooling power of >8 kW. Here we present the design choices in view of the DS-20k requirements, in particular the condenser's working principle and the cooling control, and we show test results obtained with a dedicated benchmarking platform at CERN and LNGS. We find that the thermal efficiency of the recirculation loop, defined in terms of nitrogen consumption per argon flow rate, is 95 % and the pressure in the test cryostat can be maintained within $\pm$(0.1-0.2) mbar. We further detail a 5-day cool-down procedure of the test cryostat, maintaining a cooling rate typically within -2 K/h, as required for the DS-20k inner detector. Additionally, we assess the circuit's flow resistance, and the heat transfer capabilities of two heat exchanger geometries for argon phase change, used to provide gas for recirculation. We conclude by discussing how our findings influence the finalisation of the system design, including necessary modifications to meet requirements and ongoing testing activities., Comment: 45 pages, 24 figures
Published: 2024

2. DarkSide-20k sensitivity to light dark matter particles

Author: Collaboration, DarkSide-20k, Acerbi, F., Adhikari, P., Agnes, P., Ahmad, I., Albergo, S., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Amaudruz, P., Angiolilli, M., Aprile, E., Ardito, R., Corona, M. Atzori, Auty, D. J., Ave, M., Avetisov, I. C., Azzolini, O., Back, H. O., Balmforth, Z., Olmedo, A. Barrado, Barrillon, P., Batignani, G., Bhowmick, P., Blua, S., Bocci, V., Bonivento, W., Bottino, B., Boulay, M. G., Buchowicz, A., Bussino, S., Busto, J., Cadeddu, M., Cadoni, M., Calabrese, R., Camillo, V., Caminata, A., Canci, N., Capra, A., Caravati, M., Cárdenas-Montes, M., Cargioli, N., Carlini, M., Castellani, A., Castello, P., Cavalcante, P., Cebrian, S., Ruiz, J. M. Cela, Chashin, S., Chepurnov, A., Cifarelli, L., Cintas, D., Citterio, M., Cleveland, B., Coadou, Y., Cocco, V., Colaiuda, D., Vilda, E. Conde, Consiglio, L., Costa, B. S., Czubak, M., D'Aniello, M., D'Auria, S., Rolo, M. D. Da Rocha, Darbo, G., Davini, S., De Cecco, S., De Guido, G., Dellacasa, G., Derbin, A. V., Devoto, A., Di Capua, F., Di Ludovico, A., Di Noto, L., Di Stefano, P., Dias, L. K., Mairena, D. Díaz, Ding, X., Dionisi, C., Dolganov, G., Dordei, F., Dronik, V., Elersich, A., Ellingwood, E., Erjavec, T., Diaz, M. Fernandez, Ficorella, A., Fiorillo, G., Franchini, P., Franco, D., Gatti, H. Frandini, Frolov, E., Gabriele, F., Gahan, D., Galbiati, C., Galiński, G., Gallina, G., Gallus, G., Garbini, M., Abia, P. Garcia, Gawdzik, A., Gendotti, A., Ghisi, A., Giovanetti, G. K., Casanueva, V. Goicoechea, Gola, A., Grandi, L., Grauso, G., di Cortona, G. Grilli, Grobov, A., Gromov, M., Guerzoni, M., Gulino, M., Guo, C., Hackett, B. R., Hallin, A., Hamer, A., Haranczyk, M., Harrop, B., Hessel, T., Hill, S., Horikawa, S., Hu, J., Hubaut, F., Hucker, J., Hugues, T., Hungerford, E. V., Ianni, A., Ippolito, V., Jamil, A., Jillings, C., Jois, S., Kachru, P., Keloth, R., Kemmerich, N., Kemp, A., Kendziora, C. L., Kimura, M., Kondo, K., Korga, G., Kotsiopoulou, L., Koulosousas, S., Kubankin, A., Kunzé, P., Kuss, M., Kuźniak, M., Kuzwa, M., La Commara, M., Lai, M., Guirriec, E. Le, Leason, E., Leoni, A., Lidey, L., Lissia, M., Luzzi, L., Lychagina, O., Macfadyen, O., Machulin, I. N., Manecki, S., Manthos, I., Mapelli, L., Marasciulli, A., Mari, S. M., Mariani, C., Maricic, J., Martinez, M., Martoff, C. J., Matteucci, G., Mavrokoridis, K., McDonald, A. B., Mclaughlin, J., Merzi, S., Messina, A., Milincic, R., Minutoli, S., Mitra, A., Moioli, S., Monroe, J., Moretti, E., Morrocchi, M., Mroz, T., Muratova, V. N., Murphy, M., Murra, M., Muscas, C., Musico, P., Nania, R., Nessi, M., Nieradka, G., Nikolopoulos, K., Nikoloudaki, E., Nowak, J., Olchanski, K., Oleinik, A., Oleynikov, V., Organtini, P., de Solórzano, A. Ortiz, Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Papi, D., Pastuszak, G., Paternoster, G., Peck, A., Pegoraro, P. A., Pelczar, K., Pellegrini, L. A., Perez, R., Perotti, F., Pesudo, V., Piacentini, S. I., Pino, N., Plante, G., Pocar, A., Poehlmann, M., Pordes, S., Pralavorio, P., Price, D., Puglia, S., Bazetto, M. Queiroga, Ragusa, F., Ramachers, Y., Ramirez, A., Ravinthiran, S., Razeti, M., Renshaw, A. L., Rescigno, M., Retiere, F., Rignanese, L. P., Rivetti, A., Roberts, A., Roberts, C., Rogers, G., Romero, L., Rossi, M., Rubbia, A., Rudik, D., Sabia, M., Salomone, P., Samoylov, O., Sandford, E., Sanfilippo, S., Santone, D., Santorelli, R., Santos, E. M., Savarese, C., Scapparone, E., Schillaci, G., Schuckman II, F. G., Scioli, G., Semenov, D. A., Shalamova, V., Sheshukov, A., Simeone, M., Skensved, P., Skorokhvatov, M. D., Smirnov, O., Smirnova, T., Smith, B., Sotnikov, A., Spadoni, F., Spangenberg, M., Stefanizzi, R., Steri, A., Stornelli, V., Stracka, S., Sulis, S., Sung, A., Sunny, C., Suvorov, Y., Szelc, A. M., Taborda, O., Tartaglia, R., Taylor, A., Taylor, J., Tedesco, S., Testera, G., Thieme, K., Thompson, A., Tonazzo, A., Torres-Lara, S., Tricomi, A., Unzhakov, E. V., Vallivilayil, T. J., Van Uffelen, M., Velazquez-Fernandez, L., Viant, T., Viel, S., Vishneva, A., Vogelaar, R. B., Vossebeld, J., Vyas, B., Walczak, M. B., Wang, Y., Wang, H., Westerdale, S., Williams, L., Wojaczyński, R., Wojcik, M., Wojcik, M. M., Wright, T., Xie, Y., Yang, C., Yin, J., Zabihi, A., Zakhary, P., Zani, A., Zhang, Y., Zhu, T., Zichichi, A., Zuzel, G., and Zykova, M. P.
Subjects: High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: The dual-phase liquid argon time projection chamber is presently one of the leading technologies to search for dark matter particles with masses below 10 GeV/c$^2$. This was demonstrated by the DarkSide-50 experiment with approximately 50 kg of low-radioactivity liquid argon as target material. The next generation experiment DarkSide-20k, currently under construction, will use 1,000 times more argon and is expected to start operation in 2027. Based on the DarkSide-50 experience, here we assess the DarkSide-20k sensitivity to models predicting light dark matter particles, including Weakly Interacting Massive Particles (WIMPs) and sub-GeV/c$^2$ particles interacting with electrons in argon atoms. With one year of data, a sensitivity improvement to dark matter interaction cross-sections by at least one order of magnitude with respect to DarkSide-50 is expected for all these models. A sensitivity to WIMP--nucleon interaction cross-sections below $1\times10^{-42}$ cm$^2$ is achievable for WIMP masses above 800 MeV/c$^2$. With 10 years exposure, the neutrino fog can be reached for WIMP masses around 5 GeV/c$^2$., Comment: submitted to Nature Communications
Published: 2024

3. Interpretable machine learning approach for electron antineutrino selection in a large liquid scintillator detector

Author: Gavrikov, A., Cerrone, V., Serafini, A., Brugnera, R., Garfagnini, A., Grassi, M., Jelmini, B., Lastrucci, L., Aiello, S., Andronico, G., Antonelli, V., Barresi, A., Basilico, D., Beretta, M., Bergnoli, A., Borghesi, M., Brigatti, A., Bruno, R., Budano, A., Caccianiga, B., Cammi, A., Caruso, R., Chiesa, D., Clementi, C., Dusini, S., Fabbri, A., Felici, G., Ferraro, F., Giammarchi, M. G., Giugice, N., Guizzetti, R. M., Guardone, N., Landini, C., Lippi, I., Loffredo, S., Loi, L., Lombardi, P., Lombardo, C., Mantovani, F., Mari, S. M., Martini, A., Miramonti, L., Montuschi, M., Nastasi, M., Orestano, D., Ortica, F., Paoloni, A., Percalli, E., Petrucci, F., Previtali, E., Ranucci, G., Re, A. C., Redchuck, M., Ricci, B., Romani, A., Saggese, P., Sava, G., Sirignano, C., Sisti, M., Stanco, L., Farilla, E. Stanescu, Strati, V., Torri, M. D. C., Triossi, A., Tuvé, C., Venettacci, C., Verde, G., and Votano, L.
Subjects: Physics - Instrumentation and Detectors, Computer Science - Machine Learning, High Energy Physics - Experiment, Physics - Data Analysis, Statistics and Probability
Abstract: Several neutrino detectors, KamLAND, Daya Bay, Double Chooz, RENO, and the forthcoming large-scale JUNO, rely on liquid scintillator to detect reactor antineutrino interactions. In this context, inverse beta decay represents the golden channel for antineutrino detection, providing a pair of correlated events, thus a strong experimental signature to distinguish the signal from a variety of backgrounds. However, given the low cross-section of antineutrino interactions, the development of a powerful event selection algorithm becomes imperative to achieve effective discrimination between signal and backgrounds. In this study, we introduce a machine learning (ML) model to achieve this goal: a fully connected neural network as a powerful signal-background discriminator for a large liquid scintillator detector. We demonstrate, using the JUNO detector as an example, that, despite the already high efficiency of a cut-based approach, the presented ML model can further improve the overall event selection efficiency. Moreover, it allows for the retention of signal events at the detector edges that would otherwise be rejected because of the overwhelming amount of background events in that region. We also present the first interpretable analysis of the ML approach for event selection in reactor neutrino experiments. This method provides insights into the decision-making process of the model and offers valuable information for improving and updating traditional event selection approaches.
Published: 2024

4. Distillation and Stripping purification plants for JUNO liquid scintillator

Author: Landini, C., Beretta, M., Lombardi, P., Brigatti, A., Montuschi, M., Parmeggiano, S., Ranucci, G., Antonelli, V., Basilico, D., Caccianiga, B., Giammarchi, M. G., Miramonti, L., Percalli, E., Re, A. C., Saggese, P., Torri, M. D. C., Aiello, S., Andronico, G., Barresi, A., Bergnoli, A., Borghesi, M., Brugnera, R., Bruno, R., Budano, A., Cammi, A., Cerrone, V., Caruso, R., Chiesa, D., Clementi, C., Dusini, S., Fabbri, A., Felici, G., Garfagnini, A., Giudice, N., Gavrikov, A., Grassi, M., Guizzetti, R. M., Guardone, N., Jelmini, B., Lastrucci, L., Lippi, I., Loi, L., Lombardo, C., Mantovani, F., Mari, S. M., Martini, A., Nastasi, M., Orestano, D., Ortica, F., Paoloni, A., Petrucci, F., Previtali, E., Redchuck, M., Ricci, B., Romani, A., Sava, G., Serafini, A., Sirignano, C., Sisti, M., Stanco, L., Farilla, E. Stanescu, Strati, V., Triossi, A., Tuvè, C., Venettacci, C., Verde, G., and Votano, L.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: The optical and radiochemical purification of the scintillating liquid, which will fill the central detector of the JUNO experiment, plays a crucial role in achieving its scientific goals. Given its gigantic mass and dimensions and an unprecedented target value of about 3% @ 1 MeV in energy resolution, JUNO has set severe requirements on the parameters of its scintillator, such as attenuation length (Lat>20 m at 430 nm), transparency, light yield, and content of radioactive contaminants (238U,232Th<10-15 g/g). To accomplish these needs, the scintillator will be processed using several purification methods, including distillation in partial vacuum and gas stripping, which are performed in two large scale plants installed at the JUNO site. In this paper, layout, operating principles, and technical aspects which have driven the design and construction of the distil- lation and gas stripping plants are reviewed. The distillation is effective in enhancing the optical properties and removing heavy radio-impurities (238U,232Th, 40K), while the stripping process exploits pure water steam and high-purity nitrogen to extract gaseous contaminants (222Rn, 39Ar, 85Kr, O2) from the scintillator. The plant operating parameters have been tuned during the recent com- missioning phase at the JUNO site and several QA/QC measurements and tests have been performed to evaluate the performances of the plants. Some preliminary results on the efficiency of these purification processes will be shown., Comment: 11 pages, 7 figures
Published: 2024

5. Refractive index in the JUNO liquid scintillator

Author: Zhang, H. S., Beretta, M., Cialdi, S., Yang, C. X., Huang, J. H., Ferraro, F., Cao, G. F., Reina, G., Deng, Z. Y., Suerra, E., Altilia, S., Antonelli, V., Basilico, D., Brigatti, A., Caccianiga, B., Giammarchi, M. G., Landini, C., Lombardi, P., Miramonti, L., Percalli, E., Ranucci, G., Re, A. C., Saggese, P., Torri, M. D. C., Aiello, S., Andronico, G., Barresi, A., Bergnoli, A., Borghesi, M., Brugnera, R., Bruno, R., Budano, A., Cammi, A., Cerrone, V., Caruso, R., Chiesa, D., Clementi, C., Dusini, S., Fabbri, A., Felici, G., Garfagnini, A., Giudice, N., Gavrikov, A., Grassi, M., Guizzetti, R. M., Guardone, N., Jelmini, B., Lastrucci, L., Lippi, I., Loi, L., Lombardo, C., Mantovani, F., Mari, S. M., Martini, A., Montuschi, M., Nastasi, M., Orestano, D., Ortica, F., Paoloni, A., Petrucci, F., Previtali, E., Redchuck, M., Ricci, B., Romani, A., Sava, G., Serafini, A., Sirignano, C., Sisti, M., Stanco, L., Farilla, E. Stanescu, Strati, V., Triossi, A., Tuvé, C., Venettacci, C., Verde, G., and Votano, L.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: In the field of rare event physics, it is common to have huge masses of organic liquid scintillator as detection medium. In particular, they are widely used to study neutrino properties or astrophysical neutrinos. Thanks to its safety properties (such as low toxicity and high flash point) and easy scalability, linear alkyl benzene is the most common solvent used to produce liquid scintillators for large mass experiments. The knowledge of the refractive index is a pivotal point to understand the detector response, as this quantity (and its wavelength dependence) affects the Cherenkov radiation and photon propagation in the medium. In this paper, we report the measurement of the refractive index of the JUNO liquid scintillator between 260-1064 nm performed with two different methods (an ellipsometer and a refractometer), with a sub percent level precision. In addition, we used an interferometer to measure the group velocity in the JUNO liquid scintillator and verify the expected value derived from the refractive index measurements., Comment: 6 pages, 9 figures
Published: 2024

6. A new hybrid gadolinium nanoparticles-loaded polymeric material for neutron detection in rare event searches

Author: Collaboration, DarkSide-20k, Acerbi, F., Adhikari, P., Agnes, P., Ahmad, I., Albergo, S., Albuquerque, I. F., Alexander, T., Alton, A. K., Amaudruz, P., Angiolilli, M., Aprile, E., Ardito, R., Corona, M. Atzori, Auty, D. J., Ave, M., Avetisov, I. C., Azzolini, O., Back, H. O., Balmforth, Z., Olmedo, A. Barrado, Barrillon, P., Batignani, G., Bhowmick, P., Bocci, V., Bonivento, W., Bottino, B., Boulay, M. G., Buchowicz, A., Bussino, S., Busto, J., Cadeddu, M., Cadoni, M., Calabrese, R., Camillo, V., Caminata, A., Canci, N., Capra, A., Caravati, M., Cárdenas-Montes, M., Cargioli, N., Carlini, M., Castellani, A., Castello, P., Cavalcante, P., Cavallo, D., Cebrian, S., Ruiz, J. Cela, Chashin, S., Chepurnov, A., Cifarelli, L., Cintas, D., Citterio, M., Cleveland, B., Coadou, Y., Cocco, V., Colaiuda, D., Vilda, E. Conde, Consiglio, L., Costa, B. S., Czubak, M., D'Auria, S., Rolo, M. D. Da Rocha, Darbo, G., Davini, S., De Cecco, S., De Guido, G., Dellacasa, G., Derbin, A. V., Devoto, A., Di Capua, F., Di Ludovico, A., Di Noto, L., Di Stefano, P., Dias, L. K., Mairena, D. Díaz, Ding, X., Dionisi, C., Dolganov, G., Dordei, F., Dronik, V., Elersich, A., Ellingwood, E., Erjavec, T., Diaz, M. Fernandez, Ficorella, A., Fiorillo, G., Franchini, P., Franco, D., Gatti, H. Frandini, Frolov, E., Gabriele, F., Gahan, D., Galbiati, C., Galinski, G., Gallina, G., Garbini, M., Abia, P. Garcia, Gawdzik, A., Gendotti, A., Ghisi, A., Giovanetti, G. K., Casanueva, V. Goicoechea, Gola, A., Grandi, L., Grauso, G., di Cortona, G. Grilli, Grobov, A., Gromov, M., Guerzoni, M., Gulino, M., Guo, C., Hackett, B. R., Hallin, A., Hamer, A., Haranczyk, M., Harrop, B., Hessel, T., Hill, S., Horikawa, S., Hu, J., Hubaut, F., Hucker, J., Hugues, T., Hungerford, E. V., Ianni, A., Ippolito, V., Jamil, A., Jillings, C., Keloth, R., Kemmerich, N., Kemp, A., Kendziora, C. L., Kimura, M., Kondo, K., Korga, G., Kotsiopoulou, L., Koulosousas, S., Kubankin, A., Kuss, M., Kuzniak, M., Kuzwa, M., La Commara, M., Lai, M., Guirriec, E. Le, Leason, E., Leoni, A., Lidey, L., Lissia, M., Luzzi, L., Lychagina, O., Macfadyen, O., Machulin, I. N., Manecki, S., Manthos, I., Mapelli, L., Marasciulli, A., Mari, S. M., Mariani, C., Maricic, J., Marini, A., Martinez, M., Martoff, C. J., Matteucci, G., Mavrokoridis, K., McDonald, A. B., Mclaughlin, J., Merzi, S., Messina, A., Milincic, R., Minutoli, S., Mitra, A., Moharana, A., Moioli, S., Monroe, J., Moretti, E., Morrocchi, M., Mroz, T., Muratova, V. N., Murphy, M., Murra, M., Muscas, C., Musico, P., Nania, R., Nessi, M., Nieradka, G., Nikolopoulos, K., Nikoloudaki, E., Nowak, J., Olchanski, K., Oleinik, A., Oleynikov, V., Organtini, P., de Solórzano, A. Ortiz, Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Papi, D., Pastuszak, G., Paternoster, G., Peddis, D., Pegoraro, P. A., Pelczar, K., Pellegrini, L. A., Perez, R., Perotti, F., Pesudo, V., Piacentini, S. I., Pino, N., Plante, G., Pocar, A., Poehlmann, M., Pordes, S., Pralavorio, P., Price, D., Puglia, S., Bazetto, M. Queiroga, Ragusa, F., Ramachers, Y., Ramirez, A., Ravinthiran, S., Razeti, M., Renshaw, A. L., Rescigno, M., Retiere, F., Rignanese, L. P., Rivetti, A., Roberts, A., Roberts, C., Rogers, G., Romero, L., Rossi, M., Rubbia, A., Rudik, D., Sabia, M., Sadashivajois, S., Salomone, P., Samoylov, O., Sandford, E., Sanfilippo, S., Santone, D., Santorelli, R., Santos, E. M., Savarese, C., Scapparone, E., Schillaci, G., Schuckman II, F. G., Scioli, G., Semenov, D. A., Sheshukov, A., Simeone, M., Skensved, P., Skorokhvatov, M. D., Slimani, S., Smirnov, O., Smirnova, T., Smith, B., Sotnikov, A., Spadoni, F., Spangenberg, M., Stefanizzi, R., Steri, A., Stornelli, V., Stracka, S., Sulis, S., Sung, A., Sunny, C., Suvorov, Y., Szelc, A. M., Taborda, O., Tartaglia, R., Taylor, A., Taylor, J., Tedesco, S., Testera, G., Thieme, K., Thompson, A., Tonazzo, A., Torres-Lara, S., Tosi, S., Tricomi, A., Unzhakov, E. V., Vallivilayil, T. J., Van Uffelen, M., Velazquez-Fernandez, L., Viant, T., Vicini, S., Viel, S., Vishneva, A., Vogelaar, R. B., Vossebeld, J., Vyas, B., Wada, M., Walczak, M. B., Wang, H., Wang, Y., Westerdale, S., Williams, L., Wojaczynski, R., Wojcik, M. M., Wojcik, M., Wright, T., Xie, Y., Yang, C., Yin, J., Zabihi, A., Zakhary, P., Zani, A., Zhang, Y., Zhu, T., Zichichi, A., Zuzel, G., and Zykova, M. P.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: Experiments aimed at direct searches for WIMP dark matter require highly effective reduction of backgrounds and control of any residual radioactive contamination. In particular, neutrons interacting with atomic nuclei represent an important class of backgrounds due to the expected similarity of a WIMP-nucleon interaction, so that such experiments often feature a dedicated neutron detector surrounding the active target volume. In the context of the development of DarkSide-20k detector at INFN Gran Sasso National Laboratory (LNGS), several R&D projects were conceived and developed for the creation of a new hybrid material rich in both hydrogen and gadolinium nuclei to be employed as an essential element of the neutron detector. Thanks to its very high cross-section for neutron capture, gadolinium is one of the most widely used elements in neutron detectors, while the hydrogen-rich material is instrumental in efficiently moderating the neutrons. In this paper results from one of the R&Ds are presented. In this effort the new hybrid material was obtained as a poly(methyl methacrylate) (PMMA) matrix, loaded with gadolinium oxide in the form of nanoparticles. We describe its realization, including all phases of design, purification, construction, characterization, and determination of mechanical properties of the new material.
Published: 2024
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7. Long-term temporal stability of the DarkSide-50 dark matter detector

Author: Collaboration, The DarkSide-50, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Campos, M. D., Canci, N., Caravati, M., Cargioli, N., Cariello, M., Carlini, M., Cataudella, V., Cavalcante, P., Cavuoti, S., Chashin, S., Chepurnov, A., Cicalò, C., Covone, G., D'Angelo, D., Davini, S., De Candia, A., De Cecco, S., De Filippis, G., De Rosa, G., Derbin, A. V., Devoto, A., D'Incecco, M., Dionisi, C., Dordei, F., Downing, M., D'Urso, D., Fairbairn, M., Fiorillo, G., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giganti, C., Giovanetti, G. K., Goretti, A. M., di Cortona, G. Grilli, Grobov, A., Gromov, M., Guan, M., Gulino, M., Hackett, B. R., Herner, K., Hessel, T., Hosseini, B., Hubaut, F., Hugues, T., Hungerford, E. V., Ianni, An., Ippolito, V., Keeter, K., Kendziora, C. L., Kimura, M., Kochanek, I., Korablev, D., Korga, G., Kubankin, A., Kuss, M., Kuźniak, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Lychagina, O., Machulin, I. N., Mapelli, L. P., Mari, S. M., Maricic, J., Messina, A., Milincic, R., Monroe, J., Morrocchi, M., Mougeot, X., Muratova, V. N., Musico, P., Nozdrina, A. O., Oleinik, A., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Piacentini, S., Pocar, A., Poehlmann, D. M., Pordes, S., Poudel, S. S., Pralavorio, P., Price, D. D., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Rode, J., Romani, A., Sablone, D., Samoylov, O., Sandford, E., Sands, W., Sanfilippo, S., Savarese, C., Schlitzer, B., Semenov, D. A., Shchagin, A., Sheshukov, A., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Unzhakov, E. V., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wojcik, M. M., Xiao, X., Yang, C., and Zuzel, G.
Subjects: High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics, Physics - Instrumentation and Detectors
Abstract: The stability of a dark matter detector on the timescale of a few years is a key requirement due to the large exposure needed to achieve a competitive sensitivity. It is especially crucial to enable the detector to potentially detect any annual event rate modulation, an expected dark matter signature. In this work, we present the performance history of the DarkSide-50 dual-phase argon time projection chamber over its almost three-year low-radioactivity argon run. In particular, we focus on the electroluminescence signal that enables sensitivity to sub-keV energy depositions. The stability of the electroluminescence yield is found to be better than 0.5%. Finally, we show the temporal evolution of the observed event rate around the sub-keV region being consistent to the background prediction., Comment: 13 pages, 5 figures
Published: 2023
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8. Analysis of reactor burnup simulation uncertainties for antineutrino spectrum prediction

Author: Barresi, A., Borghesi, M., Cammi, A., Chiesa, D., Loi, L., Nastasi, M., Previtali, E., Sisti, M., Aiello, S., Andronico, G., Antonelli, V., Basilico, D., Beretta, M., Bergnoli, A., Brigatti, A., Brugnera, R., Bruno, R., Budano, A., Caccianiga, B., Cerrone, V., Caruso, R., Clementi, C., Dusini, S., Fabbri, A., Felici, G., Ferraro, F., Garfagnini, A., Giammarchi, M. G., Giugice, N., Gavrikov, A., Grassi, M., Guizzetti, R. M., Guardone, N., Jelmini, B., Landini, C., Lippi, I., Loffredo, S., Lombardi, P., Lombardo, C., Mantovani, F., Mari, S. M., Martini, A., Miramonti, L., Montuschi, M., Orestano, D., Ortica, F., Paoloni, A., Percalli, E., Petrucci, F., Ranucci, G., Re, A. C., Redchuck, M., Ricci, B., Romani, A., Saggese, P., Sava, G., Serafini, A., Sirignano, C., Stanco, L., Farilla, E. Stanescu, Strati, V., Torri, M. D. C., Triossi, A., Tuvè, C., Venettacci, C., Verde, G., and Votano, L.
Subjects: Physics - Instrumentation and Detectors
Abstract: Nuclear reactors are a source of electron antineutrinos due to the presence of unstable fission products that undergo $\beta^-$ decay. They will be exploited by the JUNO experiment to determine the neutrino mass ordering and to get very precise measurements of the neutrino oscillation parameters. This requires the reactor antineutrino spectrum to be characterized as precisely as possible both through high resolution measurements, as foreseen by the TAO experiment, and detailed simulation models. In this paper we present a benchmark analysis utilizing Serpent Monte Carlo simulations in comparison with real pressurized water reactor spent fuel data. Our objective is to study the accuracy of fission fraction predictions as a function of different reactor simulation approximations. Then, utilizing the BetaShape software, we construct fissile antineutrino spectra using the summation method, thereby assessing the influence of simulation uncertainties on reactor antineutrino spectrum.
Published: 2023

9. Search for dark matter annual modulation with DarkSide-50

Author: Collaboration, The DarkSide-50, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Campos, M. D., Canci, N., Caravati, M., Cargioli, N., Cariello, M., Carlini, M., Cataudella, V., Cavalcante, P., Cavuoti, S., Chashin, S., Chepurnov, A., Cicalò, C., Covone, G., D'Angelo, D., Davini, S., De Candia, A., De Cecco, S., De Filippis, G., De Rosa, G., Derbin, A. V., Devoto, A., D'Incecco, M., Dionisi, C., Dordei, F., Downing, M., D'Urso, D., Fairbairn, M., Fiorillo, G., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giganti, C., Giovanetti, G. K., Goretti, A. M., di Cortona, G. Grilli, Grobov, A., Gromov, M., Guan, M., Gulino, M., Hackett, B. R., Herner, K., Hessel, T., Hosseini, B., Hubaut, F., Hugues, T., Hungerford, E. V., Ianni, An., Ippolito, V., Keeter, K., Kendziora, C. L., Kimura, M., Kochanek, I., Korablev, D., Korga, G., Kubankin, A., Kuss, M., Kuźniak, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Lychagina, O., Machulin, I. N., Mapelli, L. P., Mari, S. M., Maricic, J., Messina, A., Milincic, R., Monroe, J., Morrocchi, M., Mougeot, X., Muratova, V. N., Musico, P., Nozdrina, A. O., Oleinik, A., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Piacentini, S., Pocar, A., Poehlmann, D. M., Pordes, S., Poudel, S. S., Pralavorio, P., Price, D. D., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Rode, J., Romani, A., Sablone, D., Samoylov, O., Sandford, E., Sands, W., Sanfilippo, S., Savarese, C., Schlitzer, B., Semenov, D. A., Shchagin, A., Sheshukov, A., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Unzhakov, E. V., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wojcik, M. M., Xiao, X., Yang, C., and Zuzel, G.
Subjects: High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: Dark matter induced event rate in an Earth-based detector is predicted to show an annual modulation as a result of the Earth's orbital motion around the Sun. We searched for this modulation signature using the ionization signal of the DarkSide-50 liquid argon time projection chamber. No significant signature compatible with dark matter is observed in the electron recoil equivalent energy range above $40~{\rm eV_{ee}}$, the lowest threshold ever achieved in such a search., Comment: 8 pages, 4 figures
Published: 2023

10. Search for low mass dark matter in DarkSide-50: the bayesian network approach

Author: Collaboration, The DarkSide-50, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Campos, M. D., Canci, N., Caravati, M., Cargioli, N., Cariello, M., Carlini, M., Cataudella, V., Cavalcante, P., Cavuoti, S., Chashin, S., Chepurnov, A., Cicalò, C., Covone, G., D'Angelo, D., Davini, S., De Candia, A., De Cecco, S., De Filippis, G., De Rosa, G., Derbin, A. V., Devoto, A., D'Incecco, M., Dionisi, C., Dordei, F., Downing, M., D'Urso, D., Fairbairn, M., Fiorillo, G., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giganti, C., Giovanetti, G. K., Goretti, A. M., di Cortona, G. Grilli, Grobov, A., Gromov, M., Guan, M., Gulino, M., Hackett, B. R., Herner, K., Hessel, T., Hosseini, B., Hubaut, F., Hungerford, E. V., Ianni, An., Ippolito, V., Keeter, K., Kendziora, C. L., Kimura, M., Kochanek, I., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Lychagina, O., Machulin, I. N., Mapelli, L. P., Mari, S. M., Maricic, J., Messina, A., Milincic, R., Monroe, J., Morrocchi, M., Mougeot, X., Muratova, V. N., Musico, P., Nozdrina, A. O., Oleinik, A., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Piacentini, S., Pocar, A., Poehlmann, D. M., Pordes, S., Poudel, S. S., Pralavorio, P., Price, D. D., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Rode, J., Romani, A., Sablone, D., Samoylov, O., Sandford, E., Sands, W., Sanfilippo, S., Savarese, C., Schlitzer, B., Semenov, D. A., Shchagin, A., Sheshukov, A., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Unzhakov, E. V., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wojcik, M. M., Xiao, X., Yang, C., and Zuzel, G.
Subjects: High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We present a novel approach for the search of dark matter in the DarkSide-50 experiment, relying on Bayesian Networks. This method incorporates the detector response model into the likelihood function, explicitly maintaining the connection with the quantity of interest. No assumptions about the linearity of the problem or the shape of the probability distribution functions are required, and there is no need to morph signal and background spectra as a function of nuisance parameters. By expressing the problem in terms of Bayesian Networks, we have developed an inference algorithm based on a Markov Chain Monte Carlo to calculate the posterior probability. A clever description of the detector response model in terms of parametric matrices allows us to study the impact of systematic variations of any parameter on the final results. Our approach not only provides the desired information on the parameter of interest, but also potential constraints on the response model. Our results are consistent with recent published analyses and further refine the parameters of the detector response model., Comment: 24 pages, 12 figures, 1 table
Published: 2023
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11. Sensitivity projections for a dual-phase argon TPC optimized for light dark matter searches through the ionization channel

Author: Agnes, P., Ahmad, I., Albergo, S., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Amaudruz, P., Corona, M. Atzori, Auty, D. J., Ave, M., Avetisov, I. Ch., Avetisov, R. I., Azzolini, O., Back, H. O., Balmforth, Z., Barbarian, V., Olmedo, A. Barrado, Barrillon, P., Basco, A., Batignani, G., Berzin, E., Bondar, A., Bonivento, W. M., Borisova, E., Bottino, B., Boulay, M. G., Buccino, G., Bussino, S., Busto, J., Buzulutskov, A., Cadeddu, M., Cadoni, M., Caminata, A., Canci, N., Capra, A., Caprioli, S., Caravati, M., Cárdenas-Montes, M., Cargioli, N., Carlini, M., Castello, P., Cataudella, V., Cavalcante, P., Cavuoti, S., Cebrian, S., Ruiz, J. M. Cela, Chashin, S., Chepurnov, A., Chyhyrynets, E, Cicalò, C., Cifarelli, L., Cintas, D., Cocco, V., Vilda, E. Conde, Consiglio, L., Copello, S., Covone, G., Cross, S., Czudak, P., D'Aniello, M., D'Auria, S., Rolo, M. D. Da Rocha, Dadoun, O., Daniel, M., Davini, S., De Candia, A., De Cecco, S., De Falco, A., De Filippis, G., De Gruttola, D., De Pasquale, S., De Rosa, G., Dellacasa, G., Derbin, A. V., Devoto, A., Di Capua, F., Di Noto, L., Di Stefano, P., Dionisi, C., Dolganov, G., Dordei, F., Doria, L., Erjavec, T., Diaz, M. Fernandez, Fiorillo, G., Franceschi, A., Franchini, P., Franco, D., Frolov, E., Funicello, N., Gabriele, F., Gahan, D., Galbiati, C., Gallina, G., Gallus, G., Garbini, M., Abia, P. Garcia, Gendotti, A., Ghiano, C., Giampaolo, R. A., Giganti, C., Giorgi, M. A., Giovanetti, G. K., Casanueva, V. Goicoechea, Gola, A., Gorman, D., Diaz, R. Graciani, Grauso, G., di Cortona, G. Grilli, Grobov, A., Gromov, M., Guan, M., Guerzoni, M., Gulino, M., Guo, C., Hackett, B. R., Hall, J. B., Hallin, A. L., Hamer, A., Helton, H., Haranczyk, M., Hessel, T., Hill, S., Horikawa, S., Hubaut, F., Hugues, T., Hungerford, E. V., Ianni, An., Ippolito, V., Jillings, C., Kachru, P., Kemp, A. A., Kendziora, C. L., Keppel, G., Khomyakov, A. V., Kimura, M., Kochanek, I., Kondo, K., Korga, G., Koulosousas, S., Kubankin, A., Kuss, M., Kuźniak, M., La Commara, M., Lai, M., Guirriec, E. Le, Leason, E., Li, X., Lidey, L., Lipp, J., Lissia, M., Longo, G., Luzzi, L., Macfadyen, O., Machulin, I. N., Manthos, I., Mapelli, L., Margotti, A., Mari, S. M., Mariani, C., Maricic, J., Marini, A., Martínez, M., Martoff, C. J., Masoni, A., Mavrokoridis, K., Mazzi, A., McDonald, A. B., Messina, A., Milincic, R., Moggi, A., Moharana, A., Monroe, J., Morrocchi, M., Mozhevitina, E. N., Mróz, T., Muratova, V. N., Muscas, C., Musico, P., Nania, R., Napolitano, T., Nessi, M., Nieradka, G., Nikolopoulos, K., Nikulin, I., Nowak, J., Olchansky, K., Oleinik, A., Oleynikov, V., Organtini, P., de Solórzano, A. Ortiz, Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Paternoster, G., Pegoraro, P. A., Pelczar, K., Pellegrino, C., Perotti, F., Pesudo, V., Piacentini, S., Pietropaolo, F., Pino, N., Pira, C., Pocar, A., Poehlmann, D. M., Pordes, S., Pralavorio, P., Price, D., Raffaelli, F., Ragusa, F., Ramachers, Y., Ramirez, A., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Resnati, F., Retiere, F., Rignanese, L. P., Ripoli, C., Rivetti, A., Roberts, A., Roberts, C., Rode, J., Rogers, G., Romero, L., Rossi, M., Rubbia, A., Sadashivajois, S., Saffold, T. R., Samoylov, O., Sandford, E., Sanfilippo, S., Santone, D., Santorelli, R., Savarese, C., Scapparone, E., Scioli, G., Semenov, D. A., Shchagin, A., Sheshukov, A., Simeone, M., Skensved, P., Skorokhvatov, M. D., Smirnov, O., Smirnova, T., Smith, B., Sokolov, A., Spangenberg, M., Stefanizzi, R., Steri, A., Stracka, S., Strickland, V., Stringer, M., Sulis, S., Sung, A., Suvorov, Y., Szelc, A. M., Türkoğ, C., Tartaglia, R., Taylor, A., Taylor, J., Tedesco, S., Testera, G., Thieme, K., Thorpe, T. N., Tonazzo, A., Torres-Lara, S., Tricomi, A., Unzhakov, E. V., John, T. Vallivilayil, Van Uffelen, M., Viant, T., Viel, S., Vishneva, A., Vogelaar, R. B., Vossebeld, J., Wada, M., Walczak, M. B., Wang, Y., Westerdale, S., Wheadon, R. J., Williams, L., Wingerter-Seez, I., Wojaczyński, R., Wojcik, Ma. M., Wojcik, Ma., Wright, T., Xie, Y., Yang, C., Zabihi, A., Zakhary, P., Zani, A., Zichichi, A., Zuzel, G., and Zykova, M. P.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: Dark matter lighter than 10 GeV/c$^2$ encompasses a promising range of candidates. A conceptual design for a new detector, DarkSide-LowMass, is presented, based on the DarkSide-50 detector and progress toward DarkSide-20k, optimized for a low-threshold electron-counting measurement. Sensitivity to light dark matter is explored for various potential energy thresholds and background rates. These studies show that DarkSide-LowMass can achieve sensitivity to light dark matter down to the solar neutrino floor for GeV-scale masses and significant sensitivity down to 10 MeV/c$^2$ considering the Migdal effect or interactions with electrons. Requirements for optimizing the detector's sensitivity are explored, as are potential sensitivity gains from modeling and mitigating spurious electron backgrounds that may dominate the signal at the lowest energies.
Published: 2022
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12. Search for dark matter-nucleon interactions via Migdal effect with DarkSide-50

Author: Collaboration, The DarkSide-50, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Campos, M. D., Canci, N., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Cataudella, V., Cavalcante, P., Cavuoti, S., Chashin, S., Chepurnov, A., Cicalò, C., Covone, G., D'Angelo, D., Davini, S., De Candia, A., De Cecco, S., De Filippis, G., De Rosa, G., Derbin, A. V., Devoto, A., D'Incecco, M., Dionisi, C., Dordei, F., Downing, M., D'Urso, D., Fairbairn, M., Fiorillo, G., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giganti, C., Giovanetti, G. K., Goretti, A. M., di Cortona, G. Grilli, Grobov, A., Gromov, M., Guan, M., Gulino, M., Hackett, B. R., Herner, K., Hessel, T., Hosseini, B., Hubaut, F., Hungerford, E. V., Ianni, An., Ippolito, V., Keeter, K., Kendziora, C. L., Kimura, M., Kochanek, I., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Lychagina, O., Machulin, I. N., Mapelli, L. P., Mari, S. M., Maricic, J., Messina, A., Milincic, R., Monroe, J., Morrocchi, M., Mougeot, X., Muratova, V. N., Musico, P., Nozdrina, A. O., Oleinik, A., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Piacentini, S., Picciau, E., Pocar, A., Poehlmann, D. M., Pordes, S., Poudel, S. S., Pralavorio, P., Price, D. D., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Rode, J., Romani, A., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Sanford, E., Savarese, C., Schlitzer, B., Semenov, D. A., Shchagin, A., Sheshukov, A., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Unzhakov, E. V., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wojcik, M. M., Xiao, X., Yang, C., and Zuzel, G.
Subjects: High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: Dark matter elastic scattering off nuclei can result in the excitation and ionization of the recoiling atom through the so-called Migdal effect. The energy deposition from the ionization electron adds to the energy deposited by the recoiling nuclear system and allows for the detection of interactions of sub-GeV/c$^2$ mass dark matter. We present new constraints for sub-GeV/c$^2$ dark matter using the dual-phase liquid argon time projection chamber of the DarkSide-50 experiment with an exposure of (12306 $\pm$ 184) kg d. The analysis is based on the ionization signal alone and significantly enhances the sensitivity of DarkSide-50, enabling sensitivity to dark matter with masses down to 40 MeV/c$^2$. Furthermore, it sets the most stringent upper limit on the spin independent dark matter nucleon cross section for masses below $3.6$ GeV/c$^2$., Comment: 7 pages, 3 figures
Published: 2022
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13. Search for dark matter particle interactions with electron final states with DarkSide-50

Author: Collaboration, The DarkSide-50, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Campos, M. D., Canci, N., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Cataudella, V., Cavalcante, P., Cavuoti, S., Chashin, S., Chepurnov, A., Cicalò, C., Covone, G., D'Angelo, D., Davini, S., De Candia, A., De Cecco, S., De Filippis, G., De Rosa, G., Derbin, A. V., Devoto, A., D'Incecco, M., Dionisi, C., Dordei, F., Downing, M., D'Urso, D., Fiorillo, G., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giganti, C., Giovanetti, G. K., Goretti, A. M., di Cortona, G. Grilli, Grobov, A., Gromov, M., Guan, M., Gulino, M., Hackett, B. R., Herner, K., Hessel, T., Hosseini, B., Hubaut, F., Hungerford, E. V., Ianni, An., Ippolito, V., Keeter, K., Kendziora, C. L., Kimura, M., Kochanek, I., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Lychagina, O., Machulin, I. N., Mapelli, L. P., Mari, S. M., Maricic, J., Messina, A., Milincic, R., Monroe, J., Morrocchi, M., Mougeot, X., Muratova, V. N., Musico, P., Nozdrina, A. O., Oleinik, A., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Piacentini, S., Picciau, E., Pocar, A., Poehlmann, D. M., Pordes, S., Poudel, S. S., Pralavorio, P., Price, D. D., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Rode, J., Romani, A., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Sanford, E., Savarese, C., Schlitzer, B., Semenov, D. A., Shchagin, A., Sheshukov, A., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Unzhakov, E. V., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wojcik, M. M., Xiao, X., Yang, C., and Zuzel, G.
Subjects: High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We present a search for dark matter particles with sub-GeV/$c^2$ masses whose interactions have final state electrons using the DarkSide-50 experiment's (12306 $\pm$ 184) kg d low-radioactivity liquid argon exposure. By analyzing the ionization signals, we exclude new parameter space for the dark matter-electron cross section $\bar{\sigma}_e$, the axioelectric coupling constant $g_{Ae}$, and the dark photon kinetic mixing parameter $\kappa$. We also set the first dark matter direct-detection constraints on the mixing angle $\left|U_{e4}\right|^2$ for keV sterile neutrinos., Comment: 6 pages, 2 figures
Published: 2022
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14. Search for low-mass dark matter WIMPs with 12 ton-day exposure of DarkSide-50

Author: Collaboration, The DarkSide-50, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Canci, N., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Cataudella, V., Cavalcante, P., Cavuoti, S., Chashin, S., Chepurnov, A., Cicalò, C., Covone, G., D'Angelo, D., Davini, S., De Candia, A., De Cecco, S., De Filippis, G., De Rosa, G., Derbin, A. V., Devoto, A., D'Incecco, M., Dionisi, C., Dordei, F., Downing, M., D'Urso, D., Fiorillo, G., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giganti, C., Giovanetti, G. K., Goretti, A. M., di Cortona, G. Grilli, Grobov, A., Gromov, M., Guan, M., Gulino, M., Hackett, B. R., Herner, K., Hessel, T., Hosseini, B., Hubaut, F., Hungerford, E. V., Ianni, An., Ippolito, V., Keeter, K., Kendziora, C. L., Kimura, M., Kochanek, I., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Lychagina, O., Machulin, I. N., Mapelli, L. P., Mari, S. M., Maricic, J., Messina, A., Milincic, R., Monroe, J., Morrocchi, M., Mougeot, X., Muratova, V. N., Musico, P., Nozdrina, A. O., Oleinik, A., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Piacentini, S., Picciau, E., Pocar, A., Poehlmann, D. M., Pordes, S., Poudel, S. S., Pralavorio, P., Price, D. D., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Rode, J., Romani, A., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Sanford, E., Savarese, C., Schlitzer, B., Semenov, D. A., Shchagin, A., Sheshukov, A., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Unzhakov, E. V., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wojcik, M. M., Xiao, X., Yang, C., and Zuzel, G.
Subjects: High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We report on the search for dark matter WIMPs in the mass range below 10 GeV/c$^2$, from the analysis of the entire dataset acquired with a low-radioactivity argon target by the DarkSide-50 experiment at LNGS. The new analysis benefits from more accurate calibration of the detector response, improved background model, and better determination of systematic uncertainties, allowing us to accurately model the background rate and spectra down to 0.06 keV$_{er}$. A 90% C.L. exclusion limit for the spin-independent cross section of 3 GeV/c$^2$ mass WIMP on nucleons is set at 6$\times$10$^{-43}$ cm$^2$, about a factor 10 better than the previous DarkSide-50 limit. This analysis extends the exclusion region for spin-independent dark matter interactions below the current experimental constraints in the $[1.2, 3.6]$ GeV/c$^2$ WIMP mass range., Comment: 11 pages, 12 figures
Published: 2022
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15. Calibration of the liquid argon ionization response to low energy electronic and nuclear recoils with DarkSide-50

Author: The DarkSide collaboration, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Canci, N., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Chepurnov, A., Cicalò, C., Cocco, A. G., Covone, G., D'Angelo, D., Davini, S., De Candia, A., De Cecco, S., De Filippis, G., De Rosa, G., Derbin, A. V., Devoto, A., D'Incecco, M., Dionisi, C., Dordei, F., Downing, M., D'Urso, D., Fiorillo, G., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giganti, C., Giovanetti, G. K., Gorchakov, O., Goretti, A. M., Grobov, A., Gromov, M., Guan, M., Guardincerri, Y., Gulino, M., Hackett, B. R., Herner, K., Hosseini, B., Hubaut, F., Hungerford, E. V., Ianni, An., Ippolito, V., Keeter, K., Kendziora, C. L., Kochanek, I., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Machulin, I. N., Mapelli, L. P., Mari, S. M., Maricic, J., Martoff, C. J., Messina, A., Meyers, P. D., Milincic, R., Morrocchi, M., Mougeot, X., Muratova, V. N., Musico, P., Agasson, A. Navrer, Nozdrina, A. O., Oleinik, A., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Picciau, E., Pocar, A., Pordes, S., Poudel, S. S., Pralavorio, P., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Rode, J., Romani, A., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Savarese, C., Schlitzer, B., Semenov, D. A., Shchagin, A., Sheshukov, A., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Unzhakov, E. V., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wojcik, M. M., Xiao, X., Yang, C., and Zuzel, G.
Subjects: Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract: DarkSide-50 has demonstrated the high potential of dual-phase liquid argon time projection chambers in exploring interactions of WIMPs in the GeV/c$^2$ mass range. The technique, based on the detection of the ionization signal amplified via electroluminescence in the gas phase, allows to explore recoil energies down to the sub-keV range. We report here on the DarkSide-50 measurement of the ionization yield of electronic recoils down to $\sim$180~eV$_{er}$, exploiting $^{37}$Ar and $^{39}$Ar decays, and extrapolated to a few ionization electrons with the Thomas-Imel box model. Moreover, we present a model-dependent determination of the ionization response to nuclear recoils down to $\sim$500~eV$_{nr}$, the lowest ever achieved in liquid argon, using \textit{in situ} neutron calibration sources and external datasets from neutron beam experiments., Comment: 11 pages, 12 figures, 1 table
Published: 2021
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16. A study of events with photoelectric emission in the DarkSide-50 liquid argon Time Projection Chamber

Author: Collaboration, The DarkSide-50, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Canci, N., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Chepurnov, A., Cicalo, C., Cocco, A. G., Covone, G., D'Angelo, D., Davini, S., De Candia, A., De Cecco, S., De Filippis, G., De Rosa, G., Derbin, A. V., Devoto, A., D'Incecco, M., Dionisi, C., Dordei, F., Downing, M., D'Urso, D., Fiorillo, G., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giganti, C., Giovanetti, G. K., Gorchakov, O., Goretti, A. M., Grobov, A., Gromov, M., Guan, M., Guardincerri, Y., Gulino, M., Hackett, B. R., Herner, K., Hosseini, B., Hubaut, F., Hungerford, E. V., Ianni, An., Ippolito, V., Keeter, K., Kendziora, C. L., Kochanek, I., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Machulin, I. N., Mapelli, L. P., Mari, S. M., Maricic, J., Martoff, C. J., Messina, A., Meyers, P. D., Milincic, R., Morrocchi, M., Muratova, V. N., Musico, P., Agasson, A. Navrer, Nozdrina, A. O., Oleinik, A., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Picciau, E., Pocar, A., Pordes, S., Poudel, S. S., Pralavorio, P., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Rode, J., Romani, A., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Savarese, C., Schlitzer, B., Semenov, D. A., Shchagin, A., Sheshukov, A., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Unzhakov, E. V., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wojcik, Ma. M., Xiao, X., Yang, C., and Zuzel, G.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: Finding unequivocal evidence of dark matter interactions in a particle detector is a major objective of physics research. Liquid argon time projection chambers offer a path to probe Weakly Interacting Massive Particles scattering cross sections on nucleus down to the so-called neutrino floor, in a mass range from few GeV's to hundredths of TeV's. Based on the successful operation of the DarkSide-50 detector at LNGS, a new and more sensitive experiment, DarkSide-20k, has been designed and is now under construction. A thorough understanding of the DarkSide-50 detector response and, therefore, of all kind of observed events, is essential for an optimal design of the new experiment. In this paper, we report on a particular set of events, which were not used for dark matter searches. Namely, standard two-pulse scintillation-ionization signals accompanied by a small amplitude third pulse, originating from single or few electrons, in a time window of less than a maximum drift time. We compare our findings to those of a recent paper of the LUX Collaboration (D.S.Akerib et al. Phys.Rev.D 102, 092004). Indeed, both experiments observe events related to photoionization of the cathode. From the measured rate of these events, we estimate for the first time the quantum efficiency of the tetraphenyl butadiene deposited on the DarkSide-50 cathode at wavelengths around 128 nm, in liquid argon. Also, both experiments observe events likely related to photoionization of impurities in the liquid. The probability of photoelectron emission per unit length turns out to be one order of magnitude smaller in DarkSide-50 than in LUX. This result, together with the much larger measured electron lifetime, coherently hints toward a lower concentration of contaminants in DarkSide-50 than in LUX., Comment: 10 pages, 8 figures, 1 table
Published: 2021

17. Performance of the ReD TPC, a novel double-phase LAr detector with Silicon Photomultiplier Readout

Author: Agnes, P., Albergo, S., Albuquerque, I., Arba, M., Ave, M., Boiano, A., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Caminata, A., Canci, N., Cappello, G., Caravati, M., Cariello, M., Castellano, S., Catalanotti, S., Cataudella, V., Cereseto, R., Cesarano, R., Cicalò, C., Covone, G., de Candia, A., De Filippis, G., De Rosa, G., Davini, S., Dionisi, C., Dolganov, G., Fiorillo, G., Franco, D., Giovanetti, G. K., Galbiati, C., Gulino, M., Ippolito, V., Kemmerich, N., Kochanek, I., Korga, G., Kuss, M., La Commara, M., La Delfa, L., Leyton, M., Li, X., Lissia, M., Mari, S. M., Martoff, C. J., Masone, V., Matteucci, G., Musico, P., Oleynikov, V., Pallavicini, M., Pandola, L., Razeto, A., Rescigno, M., Rode, J., Rossi, N., Sablone, D., Sanfilippo, S., Scapparone, E., Sosa, A., Suvorov, Y., Testera, G., Tricomi, A., Tuveri, M., Wada, M., Wang, H., Wang, Y., and Westerdale, S.
Subjects: Physics - Instrumentation and Detectors
Abstract: A double-phase argon Time Projection Chamber (TPC), with an active mass of 185 g, has been designed and constructed for the Recoil Directionality (ReD) experiment. The aim of the ReD project is to investigate the directional sensitivity of argon-based TPCs via columnar recombination to nuclear recoils in the energy range of interest (20-200 keV$_{nr}$) for direct dark matter searches. The key novel feature of the ReD TPC is a readout system based on cryogenic Silicon Photomultipliers, which are employed and operated continuously for the first time in an argon TPC. Over the course of six months, the ReD TPC was commissioned and characterised under various operating conditions using $\gamma$-ray and neutron sources, demonstrating remarkable stability of the optical sensors and reproducibility of the results. The scintillation gain and ionisation amplification of the TPC were measured to be $g_1 = (0.194 \pm 0.013)$ PE/photon and $g_2 = (20.0 \pm 0.9)$ PE/electron, respectively. The ratio of the ionisation to scintillation signals (S2/S1), instrumental for the positive identification of a candidate directional signal induced by WIMPs, has been investigated for both nuclear and electron recoils. At a drift field of 183 V/cm, an S2/S1 dispersion of 12% was measured for nuclear recoils of approximately 60-90 keV$_{nr}$, as compared to 18% for electron recoils depositing 60 keV of energy. The detector performance reported here meets the requirements needed to achieve the principal scientific goals of the ReD experiment in the search for a directional effect due to columnar recombination. A phenomenological parameterisation of the recombination probability in LAr is presented and employed for modeling the dependence of scintillation quenching and charge yield on the drift field for electron recoils between 50-500 keV and fields up to 1000 V/cm., Comment: 19 pages, 19 figures, prepared for submission to EPJ C
Published: 2021
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18. Separating $^{39}$Ar from $^{40}$Ar by cryogenic distillation with Aria for dark matter searches

Author: DarkSide Collaboration, Agnes, P., Albergo, S., Albuquerque, I. F. M., Alexander, T., Alici, A., Alton, A. K., Amaudruz, P., Arba, M., Arpaia, P., Arcelli, S., Ave, M., Avetissov, I. Ch., Avetisov, R. I., Azzolini, O., Back, H. O., Balmforth, Z., Barbarian, V., Olmedo, A. Barrado, Barrillon, P., Basco, A., Batignani, G., Bondar, A., Bonivento, W. M., Borisova, E., Bottino, B., Boulay, M. G., Buccino, G., Bussino, S., Busto, J., Buzulutskov, A., Cadeddu, M., Cadoni, M., Caminata, A., Canesi, E. V., Canci, N., Cappello, G., Caravati, M., C, M., Cargioli, N., Carlini, M., Carnesecchi, F., Castello, P., Castellani, A., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Cebrian, S., Ruiz, J. M. Cela, Celano, B., Chashin, S., Chepurnov, A., Cical, C., Cifarelli, L., Cintas, D., Coccetti, F., Cocco, V., Colocci, M., Vilda, E. Conde, Consiglio, L., Copello, S., Corning, J., Covone, G., Czudak, P., D'Aniello, M., D'Auria, S., Rolo, M. D. Da Rocha, Dadoun, O., Daniel, M., Davini, S., De Candia, A., De Cecco, S., De Falco, A., De Filippis, G., De Gruttola, D., De Guido, G., De Rosa, G., Della Valle, M., Dellacasa, G., De Pasquale, S., Derbin, A. V., Devoto, A., Di Noto, L., Di Eusanio, F., Dionisi, C., Di Stefano, P., Dolganov, G., Dongiovanni, D., Dordei, F., Downing, M., Erjavec, T., Falciano, S., Farenzena, S., Diaz, M. Fernandez, Filip, C., Fiorillo, G., Franceschi, A., Franco, D., Frolov, E., Funicello, N., Gabriele, F., Galbiati, C., Garbini, M., Abia, P. Garcia, Gendotti, A., Ghiano, C., Giampaolo, R. A., Giganti, C., Giorgi, M. A., Giovanetti, G. K., Gligan, M. L., Casanueva, V. Goicoechea, Gola, A., Goretti, A. M., Diaz, R. Graciani, Grigoriev, G. Y., Grobov, A., Gromov, M., Guan, M., Guerzoni, M., Guetti, M., Gulino, M., Guo, C., Hackett, B. R., Hallin, A., Haranczyk, M., Hill, S., Horikawa, S., Hubaut, F., Hugues, T., Hungerford, E. V., Ianni, An., Ippolito, V., James, C. C., Jillings, C., Kachru, P., Kemp, A. A., Kendziora, C. L., Keppel, G., Khomyakov, A. V., Kim, S., Kish, A., Kochanek, I., Kondo, K., Korga, G., Kubankin, A., Kugathasan, R., Kuss, M., Kuźniak, M., La Commara, M., La Delfa, L., La Grasta, D., Lai, M., Lami, N., Langrock, S., Leyton, M., Li, X., Lidey, L., Lippi, F., Lissia, M., Longo, G., Maccioni, N., Machulin, I. N., Mapelli, L., Marasciulli, A., Margotti, A., Mari, S. M., Maricic, J., Marinelli, M., Mart, M., Rojas, A. D. Martinez, Martini, A., Martoff, C. J., Mascia, M., Masetto, M., Masoni, A., Mazzi, A., McDonald, A. B., Mclaughlin, J., Messina, A., Meyers, P. D., Miletic, T., Milincic, R., Miola, R., Moggi, A., Moharana, A., Moioli, S., Monroe, J., Morisi, S., Morrocchi, M., Mozhevitina, E. N., Mr, T., Muratova, V. N., Murenu, A., Muscas, C., Musenich, L., Musico, P., Nania, R., Napolitano, T., Agasson, A. Navrer, Nessi, M., Nikulin, I., Nowak, J., Oleinik, A., Oleynikov, V., Pagani, L., Pallavicini, M., Palmas, S., Pandola, L., Pantic, E., Paoloni, E., Paternoster, G., Pegoraro, P. A., Pellegrini, L. A., Pellegrino, C., Pelczar, K., Perotti, F., Pesudo, V., Picciau, E., Pietropaolo, F., Pinna, T., Pocar, A., Podda, P., Poehlmann, D. M., Pordes, S., Poudel, S. S., Pralavorio, P., Price, D., Raffaelli, F., Ragusa, F., Ramirez, A., Razeti, M., Razeto, A., Renshaw, A. L., Rescia, S., Rescigno, M., Resnati, F., Retiere, F., Rignanese, L. P., Ripoli, C., Rivetti, A., Rode, J., Romero, L., Rossi, M., Rubbia, A., Rucaj, M., Sabiu, G. M., Salatino, P., Samoylov, O., S, E., Sandford, E., Sanfilippo, S., Sangiorgio, V. A., Santacroce, V., Santone, D., Santorelli, R., Santucci, A., Savarese, C., Scapparone, E., Schlitzer, B., Scioli, G., Semenov, D. A., Shaw, B., Shchagin, A., Sheshukov, A., Simeone, M., Skensved, P., Skorokhvatov, M. D., Smirnov, O., Smith, B., Sokolov, A., Stefanizzi, R., Steri, A., Stracka, S., Strickland, V., Stringer, M., Sulis, S., Suvorov, Y., Szelc, A. M., Zsücs-Balázs, J. Z., Tartaglia, R., Testera, G., Thorpe, T. N., Tonazzo, A., Torres-Lara, S., Tosti, S., Tricomi, A., Tuveri, M., Unzhakov, E. V., Usai, G., John, T. Vallivilayil, Vescovi, S., Viant, T., Viel, S., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wheadon, R. J., Williams, L., Wojcik, Ma. M., Wojcik, Ma., Xiao, X., Yang, C., Zani, A., Zenobio, F., Zichichi, A., Zuzel, G., and Zykova, M. P.
Subjects: Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: The Aria project consists of a plant, hosting a 350 m cryogenic isotopic distillation column, the tallest ever built, which is currently in the installation phase in a mine shaft at Carbosulcis S.p.A., Nuraxi-Figus (SU), Italy. Aria is one of the pillars of the argon dark-matter search experimental program, lead by the Global Argon Dark Matter Collaboration. Aria was designed to reduce the isotopic abundance of $^{39}$Ar, a $\beta$-emitter of cosmogenic origin, whose activity poses background and pile-up concerns in the detectors, in the argon used for the dark-matter searches, the so-called Underground Argon (UAr). In this paper, we discuss the requirements, design, construction, tests, and projected performance of the plant for the isotopic cryogenic distillation of argon. We also present the successful results of isotopic cryogenic distillation of nitrogen with a prototype plant, operating the column at total reflux.
Published: 2021
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19. Sensitivity of future liquid argon dark matter search experiments to core-collapse supernova neutrinos

Author: Agnes, P., Albergo, S., Albuquerque, I. F. M., Alexander, T., Alici, A., Alton, A. K., Amaudruz, P., Arcelli, S., Ave, M., Avetissov, I. Ch., Avetisov, R. I., Azzolini, O., Back, H. O., Balmforth, Z., Barbarian, V., Olmedo, A. Barrado, Barrillon, P., Basco, A., Batignani, G., Bondar, A., Bonivento, W. M., Borisova, E., Bottino, B., Boulay, M. G., Buccino, G., Bussino, S., Busto, J., Buzulutskov, A., Cadeddu, M., Cadoni, M., Caminata, A., Canci, N., Cappello, G., Caravati, M., Cárdenas-Montes, M., Carlini, M., Carnesecchi, F., Castello, P., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Cebrian, S., Ruiz, J. M. Cela, Celano, B., Chashin, S., Chepurnov, A., Chyhyrynets, E, Cicalò, C., Cifarelli, L., Cintas, D., Coccetti, F., Cocco, V., Colocci, M., Vilda, E. Conde, Consiglio, L., Copello, S., Corning, J., Covone, G., Czudak, P., D'Auria, S., Rolo, M. D. Da Rocha, Dadoun, O., Daniel, M., Davini, S., De Candia, A., De Cecco, S., De Falco, A., De Filippis, G., De Gruttola, D., De Guido, G., De Rosa, G., Della Valle, M., Dellacasa, G., De Pasquale, S., Derbin, A. V., Devoto, A., Di Noto, L., Dionisi, C., Di Stefano, P., Dolganov, G., Dordei, F., Doria, L., Downing, M., Erjavec, T., Diaz, M. Fernandez, Fiorillo, G., Franceschi, A., Franco, D., Frolov, E., Funicello, N., Gabriele, F., Galbiati, C., Garbini, M., Abia, P. Garcia, Gendotti, A., Ghiano, C., Giampaolo, R. A., Giganti, C., Giorgi, M. A., Giovanetti, G. K., Casanueva, V. Goicoechea, Gola, A., Diaz, R. Graciani, Grigoriev, G. Y., Grobov, A., Gromov, M., Guan, M., Guerzoni, M., Gulino, M., Guo, C., Hackett, B. R., Hallin, A., Haranczyk, M., Hill, S., Horikawa, S., Hubaut, F., Hugues, T., Hungerford, E. V., Ianni, An., Ippolito, V., James, C. C., Jillings, C., Kachru, P., Kemp, A. A., Kendziora, C. L., Keppel, G., Khomyakov, A. V., Kim, S., Kish, A., Kochanek, I., Kondo, K., Korga, G., Kubankin, A., Kugathasan, R., Kuss, M., Kuźniak, M., La Commara, M., Lai, M., Langrock, S., Leyton, M., Li, X., Lidey, L., Lissia, M., Longo, G., Machulin, I. N., Mapelli, L., Marasciulli, A., Margotti, A., Mari, S. M., Maricic, J., Martínez, M., Rojas, A. D. Martinez, Martoff, C. J., Masoni, A., Mazzi, A., McDonald, A. B., Mclaughlin, J., Messina, A., Meyers, P. D., Miletic, T., Milincic, R., Moggi, A., Moharana, A., Moioli, S., Monroe, J., Morisi, S., Morrocchi, M., Mozhevitina, E. N., Mróz, T., Muratova, V. N., Muscas, C., Musenich, L., Musico, P., Nania, R., Napolitano, T., Agasson, A. Navrer, Nessi, M., Nikulin, I., Nowak, J., Oleinik, A., Oleynikov, V., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Paternoster, G., Pegoraro, P. A., Pelczar, K., Pellegrini, L. A., Pellegrino, C., Perotti, F., Pesudo, V., Picciau, E., Pietropaolo, F., Pira, C., Pocar, A., Poehlmann, D. M., Pordes, S., Poudel, S. S., Pralavorio, P., Price, D., Raffaelli, F., Ragusa, F., Ramirez, A., Razeti, M., Razeto, A., Renshaw, A. L., Rescia, S., Rescigno, M., Resnati, F., Retiere, F., Rignanese, L. P., Ripoli, C., Rivetti, A., Rode, J., Romero, L., Rossi, M., Rubbia, A., Salatino, P., Samoylov, O., García, E. Sánchez, Sandford, E., Sanfilippo, S., Santone, D., Santorelli, R., Savarese, C., Scapparone, E., Schlitzer, B., Scioli, G., Semenov, D. A., Shaw, B., Shchagin, A., Sheshukov, A., Simeone, M., Skensved, P., Skorokhvatov, M. D., Smirnov, O., Smith, B., Sokolov, A., Steri, A., Stracka, S., Strickland, V., Stringer, M., Sulis, S., Suvorov, Y., Szelc, A. M., Tartaglia, R., Testera, G., Thorpe, T. N., Tonazzo, A., Torres-Lara, S., Tricomi, A., Unzhakov, E. V., Usai, G., John, T. Vallivilayil, Viant, T., Viel, S., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wheadon, R. J., Williams, L., Wojcik, Ma. M., Wojcik, Ma., Xiao, X., Yang, C., Ye, Z., Zani, A., Zichichi, A., Zuzel, G., and Zykova, M. P.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract: Future liquid-argon DarkSide-20k and ARGO detectors, designed for direct dark matter search, will be sensitive also to core-collapse supernova neutrinos, via coherent elastic neutrino-nucleus scattering. This interaction channel is flavor-insensitive with a high-cross section, enabling for a high-statistics neutrino detection with target masses of $\sim$50~t and $\sim$360~t for DarkSide-20k and ARGO, respectively. Thanks to the low-energy threshold of $\sim$0.5~keV$_{nr}$ achievable by exploiting the ionization channel, DarkSide-20k and ARGO have the potential to discover supernova bursts throughout our galaxy and up to the Small Magellanic Cloud, respectively, assuming a 11-M$_{\odot}$ progenitor star. We report also on the sensitivity to the neutronization burst, whose electron neutrino flux is suppressed by oscillations when detected via charged current and elastic scattering. Finally, the accuracies in the reconstruction of the average and total neutrino energy in the different phases of the supernova burst, as well as its time profile, are also discussed, taking into account the expected background and the detector response., Comment: 21 pages, 8 figures
Published: 2020
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20. Optimization of the JUNO liquid scintillator composition using a Daya Bay antineutrino detector

Author: Bay, Daya, collaborations, JUNO, Abusleme, A., Adam, T., Ahmad, S., Aiello, S., Akram, M., Ali, N., An, F. P., An, G. P., An, Q., Andronico, G., Anfimov, N., Antonelli, V., Antoshkina, T., Asavapibhop, B., de André, J. P. A. M., Babic, A., Balantekin, A. B., Baldini, W., Baldoncini, M., Band, H. R., Barresi, A., Baussan, E., Bellato, M., Bernieri, E., Biare, D., Birkenfeld, T., Bishai, M., Blin, S., Blum, D., Blyth, S., Bordereau, C., Brigatti, A., Brugnera, R., Budano, A., Burgbacher, P., Buscemi, M., Bussino, S., Busto, J., Butorov, I., Cabrera, A., Cai, H., Cai, X., Cai, Y. K., Cai, Z. Y., Cammi, A., Campeny, A., Cao, C. Y., Cao, G. F., Cao, J., Caruso, R., Cerna, C., Chakaberia, I., Chang, J. F., Chang, Y., Chen, H. S., Chen, P. A., Chen, P. P., Chen, S. M., Chen, S. J., Chen, X. R., Chen, Y. W., Chen, Y. X., Chen, Y., Chen, Z., Cheng, J., Cheng, Y. P., Cheng, Z. K., Chepurnov, A., Cherwinka, J. J., Chiarello, F., Chiesa, D., Chimenti, P., Chu, M. C., Chukanov, A., Chuvashova, A., Clementi, ., Clerbaux, B., Di Lorenzo, S. Conforti, Corti, D., Costa, S., Corso, F. D., Cummings, J. P., Dalager, O., De La Taille, C., Deng, F. S., Deng, J. W., Deng, Z., Deng, Z. Y., Depnering, W., Diaz, M., Ding, X. F., Ding, Y. Y., Dirgantara, B., Dmitrievsky, S., Diwan, M. V., Dohnal, T., Donchenko, G., Dong, J. M., Dornic, D., Doroshkevich, E., Dove, J., Dracos, M., Druillole, F., Du, S. X., Dusini, S., Dvorak, M., Dwyer, D. A., Enqvist, T., Enzmann, H., Fabbri, A., Fajt, L., Fan, D. H., Fan, L., Fang, C., Fang, J., Fatkina, A., Fedoseev, D., Fekete, V., Feng, L. C., Feng, Q. C., Fiorentini, G., Ford, R., Formozov, A., Fournier, A., Franke, S., Gallo, J. P., Gan, H. N., Gao, F., Garfagnini, A., Göttel, A., Genster, C., Giammarchi, M., Giaz, A., Giudice, N., Giuliani, F., Gonchar, M., Gong, G. H., Gong, H., Gorchakov, O., Gornushkin, Y., Grassi, M., Grewing, C., Gromov, M., Gromov, V., Gu, M. H., Gu, W. Q., Gu, X. F., Gu, Y., Guan, M. Y., Guardone, N., Gul, M., Guo, C., Guo, J. Y., Guo, L., Guo, W. L., Guo, X. H., Guo, Y. H., Guo, Z., Haacke, M., Hackenburg, R. W., Hackspacher, P., Hagner, C., Han, R., Han, Y., Hans, S., He, M., He, W., Heeger, K. M., Heinz, T., Heng, Y. K., Herrera, R., Higuera, A., Hong, D. J., Hor, Y. K., Hou, S. J., Hsiung, Y. B., Hu, B. Z., Hu, H., Hu, J. R., Hu, J., Hu, S. Y., Hu, T., Hu, Z. J., Huang, C. H., Huang, G. H., Huang, H. X., Huang, Q. H., Huang, W. H., Huang, X. T., Huang, Y. B., Huber, P., Hui, J. Q., Huo, L., Huo, W. J., Huss, C., Hussain, S., Insolia, A., Ioannisian, A., Ioannisyan, D., Isocrate, R., Jaffe, D. E., Jen, K. L., Ji, X. L., Ji, X. P., Ji, X. Z., Jia, H. H., Jia, J. J., Jian, S. Y., Jiang, D., Jiang, X. S., Jin, R. Y., Jing, X. P., Johnson, R. A., Jollet, C., Jones, D., Joutsenvaara, J., Jungthawan, S., Kalousis, L., Kampmann, P., Kang, L., Karagounis, M., Kazarian, N., Kettell, S. H., Khan, A., Khan, W., Khosonthongkee, K., Kinz, P., Kohn, S., Korablev, D., Kouzakov, K., Kramer, M., Krasnoperov, A., Krokhaleva, S., Krumshteyn, Z., Kruth, A., Kutovskiy, N., Kuusiniemi, P., Lachacinski, B., Lachenmaier, T., Langford, T. J., Lee, J., Lee, J. H. C., Lefevre, F., Lei, L., Lei, R., Leitner, R., Leung, J., Li, C., Li, D. M., Li, F., Li, H. T., Li, H. L., Li, J., Li, J. J., Li, J. Q., Li, K. J., Li, M. Z., Li, N., Li, Q. J., Li, R. H., Li, S. C., Li, S. F., Li, S. J., Li, T., Li, W. D., Li, W. G., Li, X. M., Li, X. N., Li, X. L., Li, X. Q., Li, Y., Li, Y. F., Li, Z. B., Li, Z. Y., Liang, H., Liang, J. J., Liebau, D., Limphirat, A., Limpijumnong, S., Lin, C. J., Lin, G. L., Lin, S. X., Lin, T., Lin, Y. H., Ling, J. J., Link, J. M., Lippi, I., Littenberg, L., Littlejohn, B. R., Liu, F., Liu, H., Liu, H. B., Liu, H. D., Liu, H. J., Liu, H. T., Liu, J. C., Liu, J. L., Liu, M., Liu, Q., Liu, R. X., Liu, S. Y., Liu, S. B., Liu, S. L., Liu, X. W., Liu, Y., Lokhov, A., Lombardi, P., Loo, K., Lorenz, S., Lu, C., Lu, H. Q., Lu, J. B., Lu, J. G., Lu, S. X., Lu, X. X., Lubsandorzhiev, B., Lubsandorzhiev, S., Ludhova, L., Luk, K. B., Luo, F. J., Luo, G., Luo, P. W., Luo, S., Luo, W. M., Lyashuk, V., Ma, Q. M., Ma, S., Ma, X. B., Ma, X. Y., Ma, Y. Q., Malyshkin, Y., Mantovani, F., Mao, Y. J., Mari, S. M., Marini, F., Marium, S., Marshall, C., Martellini, C., Martin-Chassard, G., Caicedo, D. A. Martinez, Martini, A., Martino, J., Mayilyan, D., McDonald, K. T., McKeown, R. D., Müller, A., Meng, G., Meng, Y., Meregaglia, A., Meroni, E., Meyhöfer, D., Mezzetto, M., Miller, J., Miramonti, L., Monforte, S., Montini, P., Montuschi, M., Morozov, N., Muralidharan, P., Napolitano, J., Nastasi, M., Naumov, D. V., Naumova, E., Nemchenok, I., Nikolaev, A., Ning, F. P., Ning, Z., Nunokawa, H., Oberauer, L., Ochoa-Ricoux, J. P., Olshevskiy, A., Ortica, F., Pan, H. R., Paoloni, A., Park, J., Parkalian, N., Parmeggiano, S., Patton, S., Payupol, T., Pec, V., Pedretti, D., Pei, Y. T., Pelliccia, N., Peng, A. G., Peng, H. P., Peng, J. C., Perrot, F., Petitjean, P. A., Rico, L. F. Pineres, Popov, A., Poussot, P., Pratumwan, W., Previtali, E., Pun, C. S. J., Qi, F. Z., Qi, M., Qian, S., Qian, X., Qian, X. H., Qiao, H., Qin, Z. H., Qiu, S. K., Rajput, M., Ranucci, G., Raper, N., Re, A., Rebber, H., Rebii, A., Ren, B., Ren, J., Reveco, C. M., Rezinko, T., Ricci, B., Robens, M., Roche, M., Rodphai, N., Rohwer, L., Romani, A., Rosero, R., Roskovec, B., Roth, C., Ruan, X. C., Ruan, X. D., Rujirawat, S., Rybnikov, A., Sadovsky, A., Saggese, P., Salamanna, G., Sangka, A., Sanguansak, N., Sawangwit, U., Sawatzki, J., Sawy, F., Schever, M., Schuler, J., Schwab, C., Schweizer, K., Selivanov, D., Selyunin, A., Serafini, A., Settanta, G., Settimo, M., Shahzad, M., Shi, G., Shi, J. Y., Shi, Y. J., Shutov, V., Sidorenkov, A., Simkovic, F., Sirignano, C., Siripak, J., Sisti, M., Slupecki, M., Smirnov, M., Smirnov, O., Sogo-Bezerra, T., Songwadhana, J., Soonthornthum, B., Sotnikov, A., Sramek, O., Sreethawong, W., Stahl, A., Stanco, L., Stankevich, K., Stefanik, D., Steiger, H., Steiner, H., Steinmann, J., Stender, M., Strati, V., Studenikin, A., Sun, G. X., Sun, L. T., Sun, J. L., Sun, S. F., Sun, X. L., Sun, Y. J., Sun, Y. Z., Suwonjandee, N., Szelezniak, M., Tang, J., Tang, Q., Tang, X., Tietzsch, A., Tkachev, I., Tmej, T., Treskov, K., Troni, G., Trzaska, W., Tse, W. -H., Tull, C. E., Tuve, C., van Waasen, S., Boom, J. Vanden, Vassilopoulos, N., Vedin, V., Verde, G., Vialkov, M., Viaud, B., Viren, B., Volpe, C., Vorobel, V., Votano, L., Walker, P., Wang, C., Wang, C. H., Wang, E., Wang, G. L., Wang, J., Wang, K. Y., Wang, L., Wang, M. F., Wang, M., Wang, N. Y., Wang, R. G., Wang, S. G., Wang, W., Wang, W. S., Wang, X., Wang, X. Y., Wang, Y., Wang, Y. F., Wang, Y. G., Wang, Y. M., Wang, Y. Q., Wang, Z., Wang, Z. M., Wang, Z. Y., Watcharangkool, A., Wei, H. Y., Wei, L. H., Wei, W., Wei, Y. D., Wen, L. J., Whisnant, K., White, C. G., Wiebusch, C., Wong, S. C. F., Wong, H. L. H., Wonsak, B., Worcester, E., Wu, C. H., Wu, D. R., Wu, F. L., Wu, Q., Wu, W. J., Wu, Z., Wurm, M., Wurtz, J., Wysotzki, C., Xi, Y. F., Xia, D. M., Xie, Y. G., Xie, Z. Q., Xing, Z. Z., Xu, D. L., Xu, F. R., Xu, H. K., Xu, J. L., Xu, J., Xu, M. H., Xu, T., Xu, Y., Xue, T., Yan, B. J., Yan, X. B., Yan, Y. P., Yang, A. B., Yang, C. G., Yang, H., Yang, J., Yang, L., Yang, X. Y., Yang, Y. F., Yang, Y. Z., Yao, H. F., Yasin, Z., Ye, J. X., Ye, M., Yegin, U., Yeh, M., Yermia, F., Yi, P. H., You, Z. Y., Young, B. L., Yu, B. X., Yu, C. X., Yu, C. Y., Yu, H. Z., Yu, M., Yu, X. H., Yu, Z. Y., Yuan, C. Z., Yuan, Y., Yuan, Z. X., Yuan, Z. Y., Yue, B. B., Zafar, N., Zambanini, A., Zeng, P., Zeng, S., Zeng, T. X., Zeng, Y. D., Zhan, L., Zhang, C., Zhang, F. Y., Zhang, G. Q., Zhang, H. H., Zhang, H. Q., Zhang, J., Zhang, J. B., Zhang, J. W., Zhang, P., Zhang, Q. M., Zhang, T., Zhang, X. M., Zhang, X. T., Zhang, Y., Zhang, Y. H., Zhang, Y. M., Zhang, Y. P., Zhang, Y. X., Zhang, Y. Y., Zhang, Z. J., Zhang, Z. P., Zhang, Z. Y., Zhao, F. Y., Zhao, J., Zhao, R., Zhao, S. J., Zhao, T. C., Zheng, D. Q., Zheng, H., Zheng, M. S., Zheng, Y. H., Zhong, W. R., Zhou, J., Zhou, L., Zhou, N., Zhou, S., Zhou, X., Zhu, J., Zhu, K. J., Zhuang, H. L., Zong, L., and Zou, J. H.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: To maximize the light yield of the liquid scintillator (LS) for the Jiangmen Underground Neutrino Observatory (JUNO), a 20 t LS sample was produced in a pilot plant at Daya Bay. The optical properties of the new LS in various compositions were studied by replacing the gadolinium-loaded LS in one antineutrino detector. The concentrations of the fluor, PPO, and the wavelength shifter, bis-MSB, were increased in 12 steps from 0.5 g/L and <0.01 mg/L to 4 g/L and 13 mg/L, respectively. The numbers of total detected photoelectrons suggest that, with the optically purified solvent, the bis-MSB concentration does not need to be more than 4 mg/L. To bridge the one order of magnitude in the detector size difference between Daya Bay and JUNO, the Daya Bay data were used to tune the parameters of a newly developed optical model. Then, the model and tuned parameters were used in the JUNO simulation. This enabled to determine the optimal composition for the JUNO LS: purified solvent LAB with 2.5 g/L PPO, and 1 to 4 mg/L bis-MSB., Comment: 13 pages, 8 figures
Published: 2020

21. SiPM-matrix readout of two-phase argon detectors using electroluminescence in the visible and near infrared range

Author: The DarkSide collaboration, Aalseth, C. E., Abdelhakim, S., Agnes, P., Ajaj, R., Albuquerque, I. F. M., Alexander, T., Alici, A., Alton, A. K., Amaudruz, P., Ameli, F., Anstey, J., Antonioli, P., Arba, M., Arcelli, S., Ardito, R., Arnquist, I. J., Arpaia, P., Asner, D. M., Asunskis, A., Ave, M., Back, H. O., Barbaryan, V., Olmedo, A. Barrado, Batignani, G., Bisogni, M. G., Bocci, V., Bondar, A., Bonfini, G., Bonivento, W., Borisova, E., Bottino, B., Boulay, M. G., Bunker, R., Bussino, S., Buzulutskov, A., Cadeddu, M., Cadoni, M., Caminata, A., Canci, N., Candela, A., Cantini, C., Caravati, M., Cariello, M., Carnesecchi, F., Castellani, A., Castello, P., Cavalcante, P., Cavazza, D., Cavuoti, S., Cebrian, S., Ruiz, J. M. Cela, Celano, B., Cereseto, R., Chashin, S., Cheng, W., Chepurnov, A., Cicalò, C., Cifarelli, L., Citterio, M., Coccetti, F., Cocco, V., Colocci, M., Vilda, E. Conde, Consiglio, L., Cossio, F., Covone, G., Crivelli, P., D'Antone, I., D'Incecco, M., Rolo, M. D. Da Rocha, Dadoun, O., Daniel, M., Davini, S., De Cecco, S., De Deo, M., De Falco, A., De Gruttola, D., De Guido, G., De Rosa, G., Dellacasa, G., Demontis, P., De Pasquale, S., Derbin, A. V., Devoto, A., Di Eusanio, F., Di Noto, L., Di Pietro, G., Di Stefano, P., Dionisi, C., Dolganov, G., Dordei, F., Downing, M., Edalatfar, F., Empl, A., Diaz, M. Fernandez, Filip, C., Fiorillo, G., Fomenko, K., Franceschi, A., Franco, D., Frolov, E., Froudakis, G. E., Funicello, N., Gabriele, F., Gabrieli, A., Galbiati, C., Garbini, M., Abia, P. Garcia, Fora, D. Gascón, Gendotti, A., Ghiano, C., Ghisi, A., Giampa, P., Giampaolo, R. A., Giganti, C., Giorgi, M. A., Giovanetti, G. K., Gligan, M. L., Gorchakov, O., Grab, M., Diaz, R. Graciani, Grassi, M., Grate, J. W., Grobov, A., Gromov, M., Guan, M., Guerra, M. B. B., Guerzoni, M., Gulino, M., Haaland, R. K., Hackett, B. R., Hallin, A., Haranczyk, M., Harrop, B., Hoppe, E. W., Horikawa, S., Hosseini, B., Hubaut, F., Humble, P., Hungerford, E. V., Ianni, An., Ilyasov, A., Ippolito, V., Jillings, C., Keeter, K., Kendziora, C. L., Kochanek, I., Kondo, K., Kopp, G., Korablev, D., Korga, G., Kubankin, A., Kugathasan, R., Kuss, M., La Commara, M., La Delfa, L., Lai, M., Lebois, M., Lehnert, B., Levashko, N., Li, X., Liqiang, Q., Lissia, M., Lodi, G. U., Longo, G., Lussana, R., Luzzi, L., Machado, A. A., Machulin, I. N., Mandarano, A., Manecki, S., Mapelli, L., Margotti, A., Mari, S. M., Mariani, M., Maricic, J., Marinelli, M., Marras, D., Martínez, M., Rojas, A. D. Martinez, Mascia, M., Mason, J., Masoni, A., McDonald, A. B., Messina, A., Miletic, T., Milincic, R., Moggi, A., Moioli, S., Monroe, J., Morrocchi, M., Mroz, T., Mu, W., Muratova, V. N., Murphy, S., Muscas, C., Musico, P., Nania, R., Napolitano, T., Agasson, A. Navrer, Nessi, M., Nikulin, I., Nosov, V., Nowak, J. A., Oleinik, A., Oleynikov, V., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Palmas, S., Pandola, L., Pantic, E., Paoloni, E., Pazzona, F., Peeters, S., Pegoraro, P. A., Pelczar, K., Pellegrini, L. A., Pellegrino, C., Pelliccia, N., Perotti, F., Pesudo, V., Picciau, E., Pietropaolo, F., Pocar, A., Pollmann, T. R., Portaluppi, D., Poudel, S. S., Pralavorio, P., Price, D., Radics, B., Raffaelli, F., Ragusa, F., Razeti, M., Regenfus, C., Renshaw, A. L., Rescia, S., Rescigno, M., Retiere, F., Rignanese, L. P., Ripoli, C., Rivetti, A., Rode, J., Romani, A., Romero, L., Rossi, N., Rubbia, A., Sala, P., Salatino, P., Samoylov, O., García, E. Sánchez, Sandford, E., Sanfilippo, S., Sant, M., Santone, D., Santorelli, R., Savarese, C., Scapparone, E., Schlitzer, B., Scioli, G., Segreto, E., Seifert, A., Semenov, D. A., Shchagin, A., Sheshukov, A., Siddhanta, S., Simeone, M., Singh, P. N., Skensved, P., Skorokhvatov, M. D., Smirnov, O., Sobrero, G., Sokolov, A., Sotnikov, A., Stainforth, R., Steri, A., Stracka, S., Strickland, V., Suffritti, G. B., Sulis, S., Suvorov, Y., Szelc, A. M., Tartaglia, R., Testera, G., Thorpe, T., Tonazzo, A., Tosi, A., Tuveri, M., Unzhakov, E. V., Usai, G., Vacca, A., Vázquez-Jáuregui, E., Viant, T., Viel, S., Villa, F., Vishneva, A., Vogelaar, R. B., Wahl, J., Walding, J. J., Wang, H., Wang, Y., Westerdale, S., Wheadon, R. J., Williams, R., Wilson, J., Wojcik, Ma. M., Wojcik, Ma., Wu, S., Xiao, X., Yang, C., Ye, Z., Zuffa, M., and Zuzel, G.
Subjects: Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract: Proportional electroluminescence (EL) in noble gases is used in two-phase detectors for dark matter searches to record (in the gas phase) the ionization signal induced by particle scattering in the liquid phase. The "standard" EL mechanism is considered to be due to noble gas excimer emission in the vacuum ultraviolet (VUV). In addition, there are two alternative mechanisms, producing light in the visible and near infrared (NIR) ranges. The first is due to bremsstrahlung of electrons scattered on neutral atoms ("neutral bremsstrahlung", NBrS). The second, responsible for electron avalanche scintillation in the NIR at higher electric fields, is due to transitions between excited atomic states. In this work, we have for the first time demonstrated two alternative techniques of the optical readout of two-phase argon detectors, in the visible and NIR range, using a silicon photomultiplier matrix and electroluminescence due to either neutral bremsstrahlung or avalanche scintillation. The amplitude yield and position resolution were measured for these readout techniques, which allowed to assess the detection threshold for electron and nuclear recoils in two-phase argon detectors for dark matter searches. To the best of our knowledge, this is the first practical application of the NBrS effect in detection science., Comment: 26 pages, 22 figures, 3 tables
Published: 2020
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22. Mechanical Ventilator Milano (MVM): A Novel Mechanical Ventilator Designed for Mass Scale Production in Response to the COVID-19 Pandemic

Author: Galbiati, C., Abba, A., Agnes, P., Amaudruz, P., Arba, M., Ardellier-Desages, F., Badia, C., Batignani, G., Bellani, G., Bianchi, G., Bishop, D., Bocci, V., Bonivento, W., Bottino, B., Bouchard, M., Brice, S., Buccino, G., Bussino, S., Caminata, A., Capra, A., Caravati, M., Carlini, M., Carrozzi, L., Cela, J. M., Celano, B., Charette, C., Coelli, S., Constable, M., Cocco, V., Croci, G., Cudmore, S., Molin, A. Dal, D'Auria, S., D'Avenio, G., DeRuiter, J., De Cecco, S., De Lauretis, L., Del Tutto, M., Devoto, A., Dinon, T., Druszkiewicz, E., Fabbri, A., Ferroni, F., Fiorillo, G., Ford, R., Foti, G., Franco, D., Gabriele, F., Abia, P. Garcia, Giarratana, L. S., Givoletti, J., Givoletti, Mi., Gorini, G., Gramellini, E., Grosso, G., Guescini, F., Guetre, E., Hadden, T., Hall, J., Heavey, A., Hersak, G., Hessey, N., Ianni, An., Ienzi, C., Ippolito, V., Kendziora, C. L., King, M., Kittmer, A., Kochanek, I., Kruecken, R., La Commara, M., Leblond, G., Li, X., Lim, C., Lindner, T., Lombardi, T., Long, T., Lu, P., Lukhanin, G., Magni, G., Maharaj, R., Malosio, M., Mapelli, C., Maqueo, P., Margetak, P., Mari, S. M., Martin, L., Massacret, N., McDonald, A., Minuzzo, D., Mohayai, T. A., Tosatti, L. Molinari, Moretti, C., Muraro, A., Nati, F., Noble, A. J., Norrick, A., Olchanski, K., Palumbo, I., Paoletti, R., Paoli, N., Pearson, C., Pellegrino, C., Pesudo, V., Pocar, A., Pontesilli, M., Pordes, R., Pordes, S., Prini, A., Putignano, O., Raaf, J. L., Razeti, M., Razeto, A., Reed, D., Renshaw, A., Rescigno, M., Retiere, F., Rignanese, L. P., Rode, J., Romualdez, L. J., Santorelli, R., Sablone, D., Scapparone, E., Schaubel, T., Shaw, B., Slutsky, A. S., Smith, B., Smith, N. J. T., Spagnolo, P., Spinella, F., Stenzler, A., Steri, A., Stiaccini, L., Stoughton, C., Stringari, P., Tardocchi, M., Tartaglia, R., Testera, G., Tintori, C., Tonazzo, A., Tseng, J., Viscione, E., Vivaldi, F., Wada, M., Wang, H., Westerdale, S., Yue, S., and Zardoni, A.
Subjects: Physics - Medical Physics
Abstract: Presented here is the design of the Mechanical Ventilator Milano (MVM), a novel mechanical ventilator designed for rapid mass production in response to the COVID-19 pandemic to address the urgent shortage of intensive therapy ventilators in many countries, and the growing difficulty in procuring these devices through normal supply chains across borders. This ventilator is an electro-mechanical equivalent of the old and reliable Manley Ventilator, and is able to operate in both pressure-controlled and pressure-supported ventilation modes. MVM is optimized for the COVID-19 emergency, thanks to the collaboration with medical doctors in the front line. MVM is designed for large-scale production in a short amount of time and at a limited cost, as it relays on off-the-shelf components, readily available worldwide. Operation of the MVM requires only a source of compressed oxygen (or compressed medical air) and electrical power. Initial tests of a prototype device with a breathing simulator are also presented. Further tests and developments are underway. At this stage the MVM is not yet a certified medical device but certification is in progress.
Published: 2020
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23. Embedded Readout Electronics R&D for the Large PMTs in the JUNO Experiment

Author: Bellato, M., Bergnoli, A., Brugnera, A., Chen, S., Chen, Z., Clerbaux, B., Corso, F. dal, Corti, D., Dong, J., Galet, G., Garfagnini, A., Giaz, A., Gong, G., Grewing, C., Hu, J., Isocrate, R., Jiang, X., Li, F., Lippi, I., Marini, F., Ning, Z., Olshevskiyi, A. G., Pedretti, D., Petitjean, P. A., Robens, M., Shutov, V., Stahl, A., Steinmannh, J., Sun, Y., van Waasen, S., Wang, Y., Wang, Z., Wei, W., Yan, X., Yang, Y., Aiello, A., Andronico, A., Antonelli, V., Bandini, W., Brigatti, A., Barresi, A., Budano, A., Bruno, R., Cabrera, A., Cammi, A., Caruso, R., Chiesa, D., Clementi, C., Costa, S., Ding, X., Dusini, S., Fabbri, A., Fargetta, M., Fiorentini, G., Ford, R., Formozov, A., Giammarchi, M., Grassi, M., Landini, C., Lombardi, P., Lombardo, C., Malyshkin, Y., Mantovani, F., Mari, S. M., Martellini, C., Martini, A., Meroni, E., Mezzetto, M., Miramonti, L., Montini, P., Montuschi, M., Nastasi, M., Ortica, F., Paoloni, A., Parmeggiano, S., Pelliccia, N., Previtali, E., Ranucci, G., Riondino, D., Re, A. C., Ricci, B., Romani, A., Saggese, P., Salamanna, G., Sawy, F. H., Serafini, A., Settanta, G., Sirignano, C., Sisti, M., Stanco, L., Strati, V., Tuvè, C., Verde, G., and Votano, L.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: Jiangmen Underground neutrino Observatory (JUNO) is a next generation liquid scintillator neutrino experiment under construction phase in South China. Thanks to the anti-neutrinos produced by the nearby nuclear power plants, JUNO will primarily study the neutrino mass hierarchy, one of the open key questions in neutrino physics. One key ingredient for the success of the measurement is to use high speed, high resolution sampling electronics located very close to the detector signal. Linearity in the response of the electronics in another important ingredient for the success of the experiment. During the initial design phase of the electronics, a custom design, with the Front-End and Read-Out electronics located very close to the detector analog signal has been developed and successfully tested. The present paper describes the electronics structure and the first tests performed on the prototypes. The electronics prototypes have been tested and they show good linearity response, with a maximum deviation of 1.3% over the full dynamic range (1-1000 p.e.), fulfilling the JUNO experiment requirements., Comment: 20 pages, 15 figures
Published: 2020
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24. Effective field theory interactions for liquid argon target in DarkSide-50 experiment

Author: Collaboration, The DarkSide-50, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonfini, G., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Canci, N., Candela, A., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Chepurnov, A., Cicalò, C., Cocco, A. G., Covone, G., D'Angelo, D., Davini, S., DeCandia, A., DeCecco, S., DeDeo, M., DeFilippis, G., DeRosa, G., Derbin, A. V., Devoto, A., DiEusanio, F., D'Incecco, M., DiPietro, G., Dionisi, C., Downing, M., D'Urso, D., Edkins, E., Empl, A., Fiorillo, G., Fomenko, K., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giagu, S., Giganti, C., Giovanetti, G. K., Gorchakov, O., Goretti, A. M., Granato, F., Grobov, A., Gromov, M., Guan, M., Guardincerri, Y., Gulino, M., Hackett, B. R., Herner, K., Hosseini, B., Hughes, D., Humble, P., Hungerford, E. V., Ianni, Al., Ianni, An., Ippolito, V., Johnson, T. N., Keeter, K., Kendziora, C. L., Kochanek, I., Koh, G., Korablev, D., Korga, G., Kubankin, A., Kuss, M., LaCommara, M., Lai, M., Li, X., Lissia, M., Longo, G., Machado, A. A., Machulin, I. N., Mandarano, A., Mapelli, L., Mari, S. M., Maricic, J., Martoff, C. J., Messina, A., Meyers, P. D., Milincic, R., Monte, A., Morrocchi, M., Muratova, V. N., Musico, P., NavrerAgasson, A., Nozdrina, A. O., Oleinik, A., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Picciau, E., Pocar, A., Pordes, S., Poudel, S. S., Qian, H., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Riffard, Q., Romani, A., Rossi, B., Rossi, N., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Savarese, C., Schlitzer, B., Segreto, E., Semenov, D. A., Shchagin, A., Sheshukov, A., Singh, P. N., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stanford, C., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Trinchese, P., Unzhakov, E. V., Verducci, M., Vishneva, A., Vogelaar, R. B., Wada, M., Waldrop, T. J., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wojcik, M. M., Xiang, X., Xiao, X., Yang, C., Ye, Z., Zhu, C., and Zuzel, G.
Subjects: High Energy Physics - Experiment, High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
Abstract: We reanalize data collected with the DarkSide-50 experiment and recently used to set limits on the spin-independent interaction rate of weakly interacting massive particles (WIMPs) on argon nuclei with an effective field theory framework. The dataset corresponds to a total (16660 $\pm$ 270) kg d exposure using a target of low-radioactivity argon extracted from underground sources. We obtain upper limits on the effective couplings of the 12 leading operators in the nonrelativistic systematic expansion. For each effective coupling we set constraints on WIMP-nucleon cross sections, setting upper limits between $2.4 \times 10^{-45} \, \mathrm{cm}^2$ and $2.3 \times 10^{-42} \, \mathrm{cm}^2$ (8.9 $\times 10^{-45} \, \mathrm{cm}^2$ and 6.0 $\times 10^{-42} \, \mathrm{cm}^2$) for WIMPs of mass of 100 $\mathrm{GeV/c^2}$ (1000 $\mathrm{GeV/c^2}$) at 90\% confidence level., Comment: Accepted by PRD
Published: 2020

25. Design and construction of a new detector to measure ultra-low radioactive-isotope contamination of argon

Author: The DarkSide Collaboration, Aalseth, C. E., Abdelhakim, S., Acerbi, F., Agnes, P., Ajaj, R., Albuquerque, I. F. M., Alexander, T., Alici, A., Alton, A. K., Amaudruz, P., Ameli, F., Anstey, J., Antonioli, P., Arba, M., Arcelli, S., Ardito, R., Arnquist, I. J., Arpaia, P., Asner, D. M., Asunskis, A., Ave, M., Back, H. O., Olmedo, A. Barrado, Batignani, G., Bisogni, M. G., Bocci, V., Bondar, A., Bonfini, G., Bonivento, W., Borisova, E., Bottino, B., Boulay, M. G., Bunker, R., Bussino, S., Buzulutskov, A., Cadeddu, M., Cadoni, M., Caminata, A., Canci, N., Candela, A., Cantini, C., Caravati, M., Cariello, M., Carnesecchi, F., Carpinelli, M., Castellani, A., Castello, P., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavazza, D., Cavuoti, S., Cebrian, S., Ruiz, J. M. Cela, Celano, B., Cereseto, R., Cheng, W., Chepurnov, A., Cicalò, C., Cifarelli, L., Citterio, M., Cocco, A. G., Cocco, V., Colocci, M., Consiglio, L., Cossio, F., Covone, G., Crivelli, P., D'Antone, I., D'Incecco, M., D'Urso, D., Rolo, M. D. Da Rocha, Dadoun, O., Daniel, M., Davini, S., De Candia, A., De Cecco, S., De Deo, M., De Falco, A., De Filippis, G., De Gruttola, D., De Guido, G., De Rosa, G., Dellacasa, G., Demontis, P., DePaquale, S., Derbin, A. V., Devoto, A., Di Eusanio, F., Di Noto, L., Di Pietro, G., Di Stefano, P., Dionisi, C., Dolganov, G., Dordei, F., Downing, M., Edalatfar, F., Empl, A., Diaz, M. Fernandez, Ferri, A., Filip, C., Fiorillo, G., Fomenko, K., Franceschi, A., Franco, D., Froudakis, G. E., Gabriele, F., Gabrieli, A., Galbiati, C., Abia, P. Garcia, Fora, D. Gascón, Gendotti, A., Ghiano, C., Ghisi, A., Giagu, S., Giampa, P., Giampaolo, R. A., Giganti, C., Giorgi, M. A., Giovanetti, G. K., Gligan, M. L., Gola, A., Gorchakov, O., Grab, M., Diaz, R. Graciani, Granato, F., Grassi, M., Grate, J. W., Grigoriev, G. Y., Grobov, A., Gromov, M., Guan, M., Guerra, M. B. B., Guerzoni, M., Gulino, M., Haaland, R. K., Hackett, B. R., Hallin, A., Harrop, B., Hoppe, E. W., Horikawa, S., Hosseini, B., Hubaut, F., Humble, P., Hungerford, E. V., Ianni, An., Ilyasov, A., Ippolito, V., Jillings, C., Keeter, K., Kendziora, C. L., Kim, S., Kochanek, I., Kondo, K., Kopp, G., Korablev, D., Korga, G., Kubankin, A., Kugathasan, R., Kuss, M., Kuźniak, M., La Commara, M., La Delfa, L., Lai, M., Langrock, S., Lebois, M., Lehnert, B., Levashko, N., Li, X., Liqiang, Q., Lissia, M., Lodi, G. U., Longo, G., Manzano, R. López, Lussana, R., Luzzi, L., Machado, A. A., Machulin, I. N., Mandarano, A., Mapelli, L., Marcante, M., Margotti, A., Mari, S. M., Mariani, M., Maricic, J., Marinelli, M., Marras, D., Martínez, M., Morales, J. J. Martínez, Rojas, A. D. Martinez, Martoff, C. J., Mascia, M., Mason, J., Masoni, A., Mazzi, A., McDonald, A. B., Messina, A., Meyers, P. D., Miletic, T., Milincic, R., Moggi, A., Moioli, S., Monroe, J., Morrocchi, M., Mroz, T., Mu, W., Muratova, V. N., Murphy, S., Muscas, C., Musico, P., Nania, R., Napolitano, T., Agasson, A. Navrer, Nessi, M., Nikulin, I., Oleinik, A., Oleynikov, V., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Palmas, S., Pandola, L., Pantic, E., Paoloni, E., Paternoster, G., Pavletcov, V., Pazzona, F., Peeters, S., Pegoraro, P. A., Pelczar, K., Pellegrini, L. A., Pellegrino, C., Pelliccia, N., Perotti, F., Pesudo, V., Picciau, E., Piemonte, C., Pietropaolo, F., Pocar, A., Pollman, T., Portaluppi, D., Poudel, S. S., Pralavorio, P., Price, D., Radics, B., Raffaelli, F., Ragusa, F., Razeti, M., Razeto, A., Regazzoni, V., Regenfus, C., Renshaw, A. L., Rescia, S., Rescigno, M., Retiere, F., Rignanese, L. P., Rivetti, A., Romani, A., Romero, L., Rossi, N., Rubbia, A., Sablone, D., Sala, P., Salatino, P., Samoylov, O., García, E. Sánchez, Sanfilippo, S., Sant, M., Santone, D., Santorelli, R., Savarese, C., Scapparone, E., Schlitzer, B., Scioli, G., Segreto, E., Seifert, A., Semenov, D. A., Shchagin, A., Sheshukov, A., Siddhanta, S., Simeone, M., Singh, P. N., Skensved, P., Skorokhvatov, M. D., Smirnov, O., Sobrero, G., Sokolov, A., Sotnikov, A., Stainforth, R., Steri, A., Stracka, S., Strickland, V., Suffritti, G. B., Sulis, S., Suvorov, Y., Szelc, A. M., Tartaglia, R., Testera, G., Thorpe, T., Tonazzo, A., Tosi, A., Tuveri, M., Unzhakov, E. V., Usai, G., Vacca, A., Vázquez-Jáuregui, E., Verducci, M., Viant, T., Viel, S., Villa, F., Vishneva, A., Vogelaar, R. B., Wada, M., Wahl, J., Walding, J. J., Wang, H., Wang, Y., Westerdale, S., Wheadon, R. J., Williams, R., Wilson, J., Wojcik, Marcin, Wojcik, Mariusz, Wu, S., Xiao, X., Yang, C., Ye, Z., Zuffa, M., and Zuzel, G.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract: Large liquid argon detectors offer one of the best avenues for the detection of galactic weakly interacting massive particles (WIMPs) via their scattering on atomic nuclei. The liquid argon target allows exquisite discrimination between nuclear and electron recoil signals via pulse-shape discrimination of the scintillation signals. Atmospheric argon (AAr), however, has a naturally occurring radioactive isotope, $^{39}$Ar, a $\beta$ emitter of cosmogenic origin. For large detectors, the atmospheric $^{39}$Ar activity poses pile-up concerns. The use of argon extracted from underground wells, deprived of $^{39}$Ar, is key to the physics potential of these experiments. The DarkSide-20k dark matter search experiment will operate a dual-phase time projection chamber with 50 tonnes of radio-pure underground argon (UAr), that was shown to be depleted of $^{39}$Ar with respect to AAr by a factor larger than 1400. Assessing the $^{39}$Ar content of the UAr during extraction is crucial for the success of DarkSide-20k, as well as for future experiments of the Global Argon Dark Matter Collaboration (GADMC). This will be carried out by the DArT in ArDM experiment, a small chamber made with extremely radio-pure materials that will be placed at the centre of the ArDM detector, in the Canfranc Underground Laboratory (LSC) in Spain. The ArDM LAr volume acts as an active veto for background radioactivity, mostly $\gamma$-rays from the ArDM detector materials and the surrounding rock. This article describes the DArT in ArDM project, including the chamber design and construction, and reviews the background required to achieve the expected performance of the detector., Comment: 13 pages, 8 figures. Corresponding author: E. S\'anchez Garc\'ia
Published: 2020
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26. $^{222}$Rn contamination mechanisms on acrylic surfaces

Author: Nastasi, M., Paonessa, A., Previtali, E., Quadrivi, E., Sisti, M., Aiello, S., Andronico, G., Antonelli, V., Baldini, W., Bellato, M., Bergnoli, A., Brigatti, A., Brugnera, R., Budano, A., Buscemi, M., Cammi, A., Caruso, R., Chiesa, D., Clementi, C., Corti, D., Costa, S., Corso, F. Dal, Ding, X. F., Dusini, S., Fabbri, A., Fiorentini, G., Ford, R., Formozov, A., Galet, G., Garfagnini, A., Giammarchi, M., Giaz, A., Grassi, M., Isocrate, R., Landini, C., Lippi, I., Lombardi, P., Malyshkin, Y., Mantovani, F., Mari, S. M., Marini, F., Martellini, C., Martini, A., Meroni, E., Mezzetto, M., Miramonti, L., Montini, P., Montuschi, M., Ortica, F., Paoloni, A., Parmeggiano, S., Pelliccia, N., Ranucci, G., Re, A. C., Ricci, B., Romani, A., Saggese, P., Salamanna, G., Sawi, F. H., Serafini, A., Settanta, G., Sirignano, C., Stanco, L., Strati, V., Tuvè, C., Verde, G., and Votano, L.
Subjects: Physics - Instrumentation and Detectors
Abstract: In this work, the $^{222}$Rn contamination mechanisms on acrylic surfaces have been investigated. $^{222}$Rn can represent a significant background source for low-background experiments, and acrylic is a suitable material for detector design thanks to its purity and transparency. Four acrylic samples have been exposed to a $^{222}$Rn rich environment for different time periods, being contaminated by $^{222}$Rn and its progenies. Subsequently, the time evolution of radiocontaminants activity on the samples has been evaluated with $\alpha$ and $\gamma$ measurements, highlighting the role of different decay modes in the contamination process. A detailed analysis of the alpha spectra allowed to quantify the implantation depth of the contaminants. Moreover, a study of both $\alpha$ and $\gamma$ measurements pointed out the $^{222}$Rn diffusion inside the samples.
Published: 2019

27. Atmospheric neutrino spectrum reconstruction with JUNO

Author: Settanta, G., Mari, S. M., Martellini, C., and Montini, P.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: The atmospheric neutrino flux represents a continuous source that can be exploited to infer properties about Cosmic Rays and neutrino oscillation physics. The JUNO observatory, a 20 kt liquid scintillator currently under construction in China, will be able to detect atmospheric neutrinos , given the large fiducial volume and the excellent energy resolution. The light produced in neutrino interactions will be collected by a double-system of photosensors: about 18.000 20" PMTs and about 25.000 3" PMTs. The rock overburden above the experimental hall is around 700 m and the experiment is expected to complete construction in 2021. In this study, the JUNO performances in reconstructing the atmospheric neutrino spectrum have been evaluated. The different time evolution of scintillation light on the PMTs allows to discriminate the flavor of the primary neutrinos. To reconstruct the time pattern of events, the signals from 3" PMTs only have been used, because of the small time resolution. A probabilistic unfolding method has been used, in order to infer the primary neutrino energy spectrum by looking at the detector output. The simulated spectrum has been reconstructed between 100 MeV and 10 GeV, showing a great potential of the detector in the atmospheric low energy region. The uncertainties on the final flux, including both statistic and the systematic contributions, range between 10% and 25%, with the best performances obtained at the GeV., Comment: 7 pages, 7 figures. Proceeding for a parallel talk at the 2019 EPS-HEP Conference. arXiv admin note: text overlap with arXiv:1901.10340
Published: 2019
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28. Towards a reconstruction of Supernova Neutrino Spectra in JUNO

Author: Martellini, C., Mari, S. M., Montini, P., and Settanta, G.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: Observation of supernovae (SN) through their neutrino emission is a fundamental point to understand both SN dynamics and neutrino physical properties. JUNO is a 20kton liquid scintillator detector, under construction in Jiangmen, China. The main aim of the experiment is to determine neutrino mass hierarchy by precisely measuring the energy spectrum of reactor electron antineutrinos. However due to its properties, JUNO has the capability of detecting a high statistics of SN events too. Existing data from SN neutrino consists only of 24 events coming from the SN 1987A,the detection of a SN burst in JUNO at $\sim 10 kpc$ will yield $\sim 5 x 10^{3}$ inverse beta decay (IBD) events from electron antineutrinos, about 1500 from proton elastic scattering (pES) above the threshold of 0.2 MeV, about 400 from electron elastic scattering (eES), plus several hundreds on other CC and NC interaction channels from all neutrino species., Comment: Poster at RICAP 2018, Rome(Italy) 4-7 September 2018. 4 pages, 2 figures
Published: 2019
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29. Measurement of the ion fraction and mobility of $^{218}$Po produced in $^{222}$Rn decays in liquid argon

Author: Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonfini, G., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Canci, N., Candela, A., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Chepurnov, A., Cicalo, C., Cocco, A. G., Covone, G., D'Angelo, D., Davini, S., De Candia, A., De Cecco, S., De Deo, M., De Filippis, G., De Rosa, G., Derbin, A. V., Devoto, A., Di Eusanio, F., D'Incecco, M., Di Pietro, G., Dionisi, C., Downing, M., D'Urso, D., Edkins, E., Empl, A., Fiorillo, G., Fomenko, K., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giagu, S., Giganti, C., Giovanetti, G. K., Gorchakov, O., Goretti, A. M., Granato, F., Grobov, A., Gromov, M., Guan, M., Guardincerri, Y., Gulino, M., Hackett, B. R., Herner, K., Hosseini, B., Hughes, D., Humble, P., Hungerford, E. V., Ianni, Al., Ianni, An., Ippolito, V., Johnson, T. N., Keeter, K., Kendziora, C. L., Kochanek, I., Koh, G., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Machado, A. A., Machulin, I. N., Mandarano, A., Mapelli, L., Mari, S. M., Maricic, J., Martoff, C. J., Messina, A., Meyers, P. D., Milincic, R., Monte, A., Morrocchi, M., Muratova, V. N., Musico, P., Agasson, A. Navrer, Nozdrina, A. O., Oleinik, A., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Picciau, E., Pocar, A., Pordes, S., Poudel, S. S., Qian, H., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Riffard, Q., Romani, A., Rossi, B., Rossi, N., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Savarese, C., Schlitzer, B., Segreto, E., Semenov, D. A., Shchagin, A., Sheshukov, A., Singh, P. N., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stanford, C., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Trinchese, P., Unzhakov, E. V., Verducci, M., Vishneva, A., Vogelaar, R. B., Wada, M., Waldrop, T. J., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wojcik, M. M., Xiang, X., Xiao, X., Yang, C., Ye, Z., Zhu, C., and Zuzel, G.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract: We report measurements of the charged daughter fraction of $^{218}$Po as a result of the $^{222}$Rn alpha decay, and the mobility of $^{218}$Po$^+$ ions, using radon-polonium coincidences from the $^{238}$U chain identified in 532 live-days of DarkSide-50 WIMP-search data. The fraction of $^{218}$Po that is charged is found to be 0.37$\pm$0.03 and the mobility of $^{218}$Po$^+$ is (8.6$\pm$0.1)$\times$10$^{-4}$$\frac{\text{cm}^2}{\text{Vs}}$.
Published: 2019
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30. Distillation and stripping pilot plants for the JUNO neutrino detector: design, operations and reliability

Author: Lombardi, P., Montuschi, M., Formozov, A., Brigatti, A., Parmeggiano, S., Pompilio, R., Depnering, W., Franke, S., Gaigher, R., Joutsenvaara, J., Mengucci, A., Meroni, E., Steiger, H., Mantovani, F., Ranucci, G., Andronico, G., Antonelli, V., Baldoncini, M., Bellato, M., Bernieri, E., Brugnera, R., Budano, A., Buscemi, M., Bussino, S., Caruso, R., Chiesa, D., Clementi, C., Corti, D., Corso, F. Dal, Ding, X. F., Dusini, S., Fabbri, A., Fiorentini, G., Ford, R., Galet, G., Garfagnini, A., Giammarchi, M., Giaz, A., Grassi, M., Insolia, A., Isocrate, R., Lippi, I., Malyshkin, Y., Mari, S. M., Marini, F., Martellini, C., Martini, A., Mezzetto, M., Miramonti, L., Monforte, S., Montini, P., Nastasi, M., Ortica, F., Paoloni, A., Pedretti, D., Pelliccia, N., Previtali, E., Re, A. C., Ricci, B., Riondino, D., Romani, A., Saggese, P., Salamanna, G., Sawy, F. H., Settanta, G., Sisti, M., Sirignano, C., Stanco, L., Strati, V., Verde, G., and Votano, L.
Subjects: Physics - Instrumentation and Detectors
Abstract: This paper describes the design, construction principles and operations of the distillation and stripping pilot plants tested at the Daya Bay Neutrino Laboratory, with the perspective to adapt this processes, system cleanliness and leak-tightness to the final full scale plants that will be used for the purification of the liquid scintillator used in the JUNO neutrino detector. The main goal of these plants is to remove radio impurities from the liquid scintillator while increasing its optical attenuation length. Purification of liquid scintillator will be performed with a system combining alumina oxide, distillation, water extraction and steam (or N2 gas) stripping. Such a combined system will aim at obtaining a total attenuation length greater than 20 m at 430 nm, and a bulk radiopurity for 238U and 232Th in the 10-15 to 10-17 g/g range. The pilot plants commissioning and operation have also provided valuable information on the degree of reliability of their main components, which will be particularly useful for the design of the final full scale purification equipment for the JUNO liquid scintillator. This paper describe two of the five pilot plants since the Alumina Column, Fluor mixing and the Water Extraction plants are in charge of the Chinese part of the collaboration.
Published: 2019
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31. Search for gamma-ray emission from the Sun during solar minimum with the ARGO-YBJ experiment

Author: Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, De Mitri, I., Piazzoli, B. D'Ettorre, Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gao, W., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Li, H. J., Li, Z., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. ., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., and Zhu, Q. Q.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: The hadronic interaction of cosmic rays with solar atmosphere can produce high energy gamma rays. The gamma-ray luminosity is correlated both with the flux of primary cosmic rays and the intensity of the solar magnetic field. The gamma rays below 200 GeV have been observed by $Fermi$ without any evident energy cutoff. The bright gamma-ray flux above 100 GeV has been detected only during solar minimum. The only available data in TeV range come from the HAWC observations, however outside the solar minimum. The ARGO-YBJ dataset has been used to search for sub-TeV/TeV gamma rays from the Sun during the solar minimum from 2008 to 2010, the same time period covered by the Fermi data. A suitable model containing the Sun shadow, solar disk emission and inverse-Compton emission has been developed, and the chi-square minimization method was used to quantitatively estimate the disk gamma-ray signal. The result shows that no significant gamma-ray signal is detected and upper limits to the gamma-ray flux at 0.3$-$7 TeV are set at 95\% confidence level. In the low energy range these limits are consistent with the extrapolation of the Fermi-LAT measurements taken during solar minimum and are compatible with a softening of the gamma-ray spectrum below 1 TeV. They provide also an experimental upper bound to any solar disk emission at TeV energies. Models of dark matter annihilation via long-lived mediators predicting gamma-ray fluxes > $10^{-7}$ GeV $cm^{-2}$ $s^{-1}$ below 1 TeV are ruled out by the ARGO-YBJ limits.
Published: 2019
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32. GIGJ: a crustal gravity model of the Guangdong Province for predicting the geoneutrino signal at the JUNO experiment

Author: Reguzzoni, M., Rossi, L., Baldoncini, M., Callegari, I., Poli, P., Sampietro, D., Strati, V., Mantovani, F., Andronico, G., Antonelli, V., Bellato, M., Bernieri, E., Brigatti, A., Brugnera, R., Budano, A., Buscemi, M., Bussino, S., Caruso, R., Chiesa, D., Corti, D., Corso, F. Dal, Ding, X. F., Dusini, S., Fabbri, A., Fiorentini, G., Ford, R., Formozov, A., Galet, G., Garfagnini, A., Giammarchi, M., Giaz, A., Grassi, M., Insolia, A., Isocrate, R., Lippi, I., Longhitano, F., Presti, D. Lo, Lombardi, P., Malyshkin, Y., Marini, F., Mari, S. M., Martellini, C., Meroni, E., Mezzetto, M., Miramonti, L., Monforte, S., Montuschi, M., Nastasi, M., Ortica, F., Paoloni, A., Parmeggiano, S., Pedretti, D., Pelliccia, N., Pompilio, R., Previtali, E., Ranucci, G., Re, A. C., Ricci, B., Romani, A., Saggese, P., Salamanna, G., Sawy, F. H., Settanta, G., Sisti, M., Sirignano, C., Spinetti, M., Stanco, L., Verde, G., and Votano, L.
Subjects: Physics - Geophysics
Abstract: Gravimetric methods are expected to play a decisive role in geophysical modeling of the regional crustal structure applied to geoneutrino studies. GIGJ (GOCE Inversion for Geoneutrinos at JUNO) is a 3D numerical model constituted by ~46 x 10$^{3}$ voxels of 50 x 50 x 0.1 km, built by inverting gravimetric data over the 6{\deg} x 4{\deg} area centered at the Jiangmen Underground Neutrino Observatory (JUNO) experiment, currently under construction in the Guangdong Province (China). The a-priori modeling is based on the adoption of deep seismic sounding profiles, receiver functions, teleseismic P-wave velocity models and Moho depth maps, according to their own accuracy and spatial resolution. The inversion method allowed for integrating GOCE data with the a-priori information and regularization conditions through a Bayesian approach and a stochastic optimization. GIGJ fits the homogeneously distributed GOCE gravity data, characterized by high accuracy, with a ~1 mGal standard deviation of the residuals, compatible with the observation accuracy. Conversely to existing global models, GIGJ provides a site-specific subdivision of the crustal layers masses which uncertainties include estimation errors, associated to the gravimetric solution, and systematic uncertainties, related to the adoption of a fixed sedimentary layer. A consequence of this local rearrangement of the crustal layer thicknesses is a ~21% reduction and a ~24% increase of the middle and lower crust expected geoneutrino signal, respectively. Finally, the geophysical uncertainties of geoneutrino signals at JUNO produced by unitary uranium and thorium abundances distributed in the upper, middle and lower crust are reduced by 77%, 55% and 78%, respectively. The numerical model is available at http://www.fe.infn.it/u/radioactivity/GIGJ, Comment: 35 pages, 9 figures, 4 tables
Published: 2019
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33. Measurement of isotopic separation of argon with the prototype of the cryogenic distillation plant Aria for dark matter searches

Author: Aaron, E., Agnes, P., Ahmad, I., Albergo, S., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Amaudruz, P., Atzori Corona, M., Ave, M., Avetisov, I. Ch., Azzolini, O., Back, H. O., Balmforth, Z., Barrado, A., Barrillon, P., Basco, A., Batignani, G., Bocci, V., Bonivento, W. M., Bottino, B., Boulay, M. G., Busto, J., Cadeddu, M., Caminata, A., Canci, N., Capra, A., Caprioli, S., Caravati, M., Cargioli, N., Carlini, M., Castello, P., Cavalcante, P., Cavuoti, S., Cebrian, S., Cela Ruiz, J. M., Chashin, S., Chepurnov, A., Chyhyrynets, E., Cifarelli, L., Cintas, D., Citterio, M., Cleveland, B., Cocco, V., Conde Vilda, E., Consiglio, L., Copello, S., Covone, G., Czubak, M., D’Aniello, M., D’Auria, S., Da Rocha Rolo, M. D., Davini, S., De Cecco, S., De Guido, G., De Gruttola, D., De Pasquale, S., De Rosa, G., Dellacasa, G., Derbin, A. V., Devoto, A., Di Capua, F., Di Noto, L., Di Stefano, P., Dolganov, G., Dordei, F., Ellingwood, E., Erjavec, T., Farenzena, S., Fernandez Diaz, M., Fiorillo, G., Franchini, P., Franco, D., Funicello, N., Gabriele, F., Gahan, D., Galbiati, C., Gallina, G., Gallus, G., Garbini, M., Garcia Abia, P., Gendotti, A., Ghiano, C., Giganti, C., Giovanetti, G. K., Goicoechea Casanueva, V., Gola, A., Grauso, G., Grilli di Cortona, G., Grobov, A., Gromov, M., Guan, M., Guerzoni, M., Gulino, M., Guo, C., Hackett, B. R., Hallin, A. L., Hamer, A., Haranczyk, M., Hessel, T., Hill, S., Horikawa, S., Hubaut, F., Hucker, J., Hugues, T., Ianni, An., Ippolito, V., Jillings, C., Jois, S., Kachru, P., Kemp, A. A., Kendziora, C. L., Kimura, M., Kochanek, I., Kondo, K., Korga, G., Koulosousas, S., Kubankin, A., Kuss, M., Kuźniak, M., La Commara, M., Lai, M., Lami, N., Le Guirriec, E., Leason, E., Leoni, A., Lidey, L., Lippi, F., Lissia, M., Luzzi, L., Lychagina, O., Maccioni, N., Macfadyen, O., Machulin, I. N., Manecki, S., Manthos, I., Mapelli, L., Margotti, A., Mari, S. M., Mariani, C., Maricic, J., Marini, A., Martínez, M., Martoff, C. J., Mascia, M., Masoni, A., Matteucci, G., Mavrokoridis, K., Maxia, C., McDonald, A. B., Messina, A., Milincic, R., Mitra, A., Moharana, A., Moioli, S., Monroe, J., Moretti, E., Morrocchi, M., Mróz, T., Muratova, V. N., Muscas, C., Musico, P., Nania, R., Nessi, M., Nikolopoulos, K., Nowak, J., Olchansky, K., Oleinik, A., Oleynikov, V., Organtini, P., de Solórzano, A. Ortiz, Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Paternoster, G., Pegoraro, P. A., Pelczar, K., Pellegrini, L. A., Pellegrino, C., Pesudo, V., Piacentini, S., Pietrofaccia, L., Pino, N., Pocar, A., Poehlmann, D. M., Pordes, S., Pralavorio, P., Price, D., Ragusa, F., Ramachers, Y., Razeti, M., Renshaw, A. L., Rescigno, M., Retiere, F., Rignanese, L. P., Ripoli, C., Rivetti, A., Roberts, A., Roberts, C., Rode, J., Rogers, G., Romero, L., Rossi, M., Rubbia, A., Sabia, M. A., Sabiu, G. M., Salomone, P., Sandford, E., Sanfilippo, S., Santone, D., Santorelli, R., Savarese, C., Scapparone, E., Schillaci, G., Schukman, F., Scioli, G., Simeone, M., Skensved, P., Skorokhvatov, M. D., Smirnov, O., Smirnova, T., Smith, B., Spadoni, F., Spangenberg, M., Stefanizzi, R., Steri, A., Stornelli, V., Stracka, S., Stringer, M., Sulis, S., Sung, A., Suvorov, Y., Szelc, A. M., Tartaglia, R., Taylor, A., Taylor, J., Tedesco, S., Testera, G., Thieme, K., Thorpe, T. N., Tonazzo, A., Tricomi, A., Unzhakov, E. V., Vallivilayil John, T., Van Uffelen, M., Viant, T., Viel, S., Vogelaar, R. B., Vossebeld, J., Wada, M., Walczak, M. B., Wang, H., Wang, Y., Westerdale, S., Williams, L., Wingerter-Seez, I., Wojaczyński, R., Wojcik, Ma. M., Wright, T., Xie, Y., Yang, C., Zabihi, A., Zakhary, P., Zani, A., Zichichi, A., Zuzel, G., and Zykova, M. P.
Published: 2023
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34. Search for low mass dark matter in DarkSide-50: the bayesian network approach

Author: Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Ave, M., Back, H. O., Batignani, G., Biery, K., Bocci, V., Bonivento, W. M., Bottino, B., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Campos, M. D., Canci, N., Caravati, M., Cargioli, N., Cariello, M., Carlini, M., Cataudella, V., Cavalcante, P., Cavuoti, S., Chashin, S., Chepurnov, A., Cicalò, C., Covone, G., D’Angelo, D., Davini, S., De Candia, A., De Cecco, S., De Filippis, G., De Rosa, G., Derbin, A. V., Devoto, A., D’Incecco, M., Dionisi, C., Dordei, F., Downing, M., D’Urso, D., Fairbairn, M., Fiorillo, G., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giganti, C., Giovanetti, G. K., Goretti, A. M., Grilli di Cortona, G., Grobov, A., Gromov, M., Guan, M., Gulino, M., Hackett, B. R., Herner, K., Hessel, T., Hosseini, B., Hubaut, F., Hungerford, E. V., Ianni, An., Ippolito, V., Keeter, K., Kendziora, C. L., Kimura, M., Kochanek, I., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Lychagina, O., Machulin, I. N., Mapelli, L. P., Mari, S. M., Maricic, J., Messina, A., Milincic, R., Monroe, J., Morrocchi, M., Mougeot, X., Muratova, V. N., Musico, P., Nozdrina, A. O., Oleinik, A., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Piacentini, S., Pocar, A., Poehlmann, D. M., Pordes, S., Poudel, S. S., Pralavorio, P., Price, D. D., Ragusa, F., Razeti, M., Razeto, A., Renshaw, A. L., Rescigno, M., Rode, J., Romani, A., Sablone, D., Samoylov, O., Sandford, E., Sands, W., Sanfilippo, S., Savarese, C., Schlitzer, B., Semenov, D. A., Shchagin, A., Sheshukov, A., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Unzhakov, E. V., Vishneva, A., Vogelaar, R. B., Wada, M., Wang, H., Wang, Y., Westerdale, S., Wojcik, M. M., Xiao, X., Yang, C., and Zuzel, G.
Published: 2023
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35. Nanoseconds Timing System Based on IEEE 1588 FPGA Implementation

Author: Pedretti, D., Bellato, M., Isocrate, R., Bergnoli, A., Brugnera, R., Corti, D., Corso, F. Dal, Galet, G., Garfagnini, A., Giaz, A., Lippi, I., Marini, F., Andronico, G., Antonelli, V., Baldoncini, M., Bernieri, E., Brigatti, A., Budano, A., Buscemi, M., Bussino, S., Caruso, R., Chiesa, D., Clementi, C., Ding, X. F., Dusini, S., Fabbri, A., Ford, R., Formozov, A., Giammarchi, M., Grassi, M., Insolia, A., Lombardi, P., Mantovani, F., Mari, S. M., Martellini, C., Martini, A., Meroni, E., Miramonti, L., Monforte, S., Montini, P., Montuschi, M., Nastasi, M., Ortica, F., Paoloni, A., Previtali, E., Ranucci, G., Re, A. C., Ricci, B., Romani, A., Salamanna, G., Sawy, F. H., Settanta, G., Sisti, M., Sirignano, C., Stanco, L., Strati, V., and Verde, G.
Subjects: Computer Science - Networking and Internet Architecture
Abstract: Clock synchronization procedures are mandatory in most physical experiments where event fragments are readout by spatially dislocated sensors and must be glued together to reconstruct key parameters (e.g. energy, interaction vertex etc.) of the process under investigation. These distributed data readout topologies rely on an accurate time information available at the frontend, where raw data are acquired and tagged with a precise timestamp prior to data buffering and central data collecting. This makes the network complexity and latency, between frontend and backend electronics, negligible within upper bounds imposed by the frontend data buffer capability. The proposed research work describes an FPGA implementation of IEEE 1588 Precision Time Protocol (PTP) that exploits the CERN Timing, Trigger and Control (TTC) system as a multicast messaging physical and data link layer. The hardware implementation extends the clock synchronization to the nanoseconds range, overcoming the typical accuracy limitations inferred by computers Ethernet based Local Area Network (LAN). Establishing a reliable communication between master and timing receiver nodes is essential in a message-based synchronization system. In the backend electronics, the serial data streams synchronization with the global clock domain is guaranteed by an hardware-based finite state machine that scans the bit period using a variable delay chain and finds the optimal sampling point. The validity of the proposed timing system has been proved in point-to-point data links as well as in star topology configurations over standard CAT-5e cables. The results achieved together with weaknesses and possible improvements are hereby detailed., Comment: 8 pages, 14 figures, proceedings of 21st IEEE Real Time Conference Colonial Williamsburg 9-15 June 2018
Published: 2018
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36. Galactic Cosmic-Ray Anisotropy in the Northern hemisphere from the ARGO-YBJ Experiment during 2008-2012

Author: Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, De Mitri, I., Piazzoli, B. D'Ettorre, Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Z. Y., Gao, W., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Ruffolo, D., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., and Zhu, Q. Q.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: This paper reports on the observation of the sidereal large-scale anisotropy of cosmic rays using data collected by the ARGO-YBJ experiment over 5 years (2008$-$2012). This analysis extends previous work limited to the period from 2008 January to 2009 December,near the minimum of solar activity between cycles 23 and 24.With the new data sample the period of solar cycle 24 from near minimum to maximum is investigated. A new method is used to improve the energy reconstruction, allowing us to cover a much wider energy range, from 4 to 520 TeV. Below 100 TeV, the anisotropy is dominated by two wide regions, the so-called "tail-in" and "loss-cone" features. At higher energies, a dramatic change of the morphology is confirmed. The yearly time dependence of the anisotropy is investigated. Finally, no noticeable variation of cosmic-ray anisotropy with solar activity is observed for a median energy of 7 TeV.
Published: 2018
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37. Low-Mass Dark Matter Search with the DarkSide-50 Experiment

Author: The DarkSide Collaboration, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Araujo, G. R., Asner, D. M., Ave, M., Back, H. O., Baldin, B., Batignani, G., Biery, K., Bocci, V., Bonfini, G., Bonivento, W., Bottino, B., Budano, F., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Canci, N., Candela, A., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Cereseto, R., Chepurnov, A., Cicalò, C., Cifarelli, L., Cocco, A. G., Covone, G., D'Angelo, D., D'Incecco, M., D'Urso, D., Davini, S., De Candia, A., De Cecco, S., De Deo, M., De Filippis, G., De Rosa, G., De Vincenzi, M., Demontis, P., Derbin, A. V., Devoto, A., Di Eusanio, F., Di Pietro, G., Dionisi, C., Downing, M., Edkins, E., Empl, A., Fan, A., Fiorillo, G., Fomenko, K., Franco, D., Gabriele, F., Gabrieli, A., Galbiati, C., Abia, P. Garcia, Ghiano, C., Giagu, S., Giganti, C., Giovanetti, G. K., Gorchakov, O., Goretti, A. M., Granato, F., Gromov, M., Guan, M., Guardincerri, Y., Gulino, M., Hackett, B. R., Hassanshahi, M. H., Herner, K., Hosseini, B., Hughes, D., Humble, P., Hungerford, E. V., Ianni, Al., Ianni, An., Ippolito, V., James, I., Johnson, T. N., Kahn, Y., Keeter, K., Kendziora, C. L., Kochanek, I., Koh, G., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lisanti, M., Lissia, M., Loer, B., Longo, G., Ma, Y., Machado, A. A., Machulin, I. N., Mandarano, A., Mapelli, L., Mari, S. M., Maricic, J., Martoff, C. J., Messina, A., Meyers, P. D., Milincic, R., Mishra-Sharma, S., Monte, A., Morrocchi, M., Mount, B. J., Muratova, V. N., Musico, P., Nania, R., Agasson, A. Navrer, Nozdrina, A. O., Oleinik, A., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pazzona, F., Pelczar, K., Pelliccia, N., Pesudo, V., Pocar, A., Pordes, S., Poudel, S. S., Pugachev, D. A., Qian, H., Ragusa, F., Razeti, M., Razeto, A., Reinhold, B., Renshaw, A. L., Rescigno, M., Riffard, Q., Romani, A., Rossi, B., Rossi, N., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Sant, M., Santorelli, R., Savarese, C., Scapparone, E., Schlitzer, B., Segreto, E., Semenov, D. A., Shchagin, A., Sheshukov, A., Singh, P. N., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stanford, C., Stracka, S., Suffritti, G. B., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Trinchese, P., Unzhakov, E. V., Verducci, M., Vishneva, A., Vogelaar, B., Wada, M., Waldrop, T. J., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wojcik, M. M., Wojcik, M., Xiang, X., Xiao, X., Yang, C., Ye, Z., Zhu, C., Zichichi, A., and Zuzel, G.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We present the results of a search for dark matter WIMPs in the mass range below 20 GeV/c^2 using a target of low-radioactivity argon. The data were obtained using the DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso (LNGS). The analysis is based on the ionization signal, for which the DarkSide-50 time projection chamber is fully efficient at 0.1 keVee. The observed rate in the detector at 0.5 keVee is about 1.5 events/keVee/kg/day and is almost entirely accounted for by known background sources. We obtain a 90% C.L. exclusion limit above 1.8 GeV/c^2 for the spin-independent cross section of dark matter WIMPs on nucleons, extending the exclusion region for dark matter below previous limits in the range 1.8-6 GeV/c^2., Comment: 9 pages, 8 figures; submission accepted by journal
Published: 2018
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38. DarkSide-50 532-day Dark Matter Search with Low-Radioactivity Argon

Author: The DarkSide Collaboration, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Araujo, G. R., Ave, M., Back, H. O., Baldin, B., Batignani, G., Biery, K., Bocci, V., Bonfini, G., Bonivento, W., Bottino, B., Budano, F., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Canci, N., Candela, A., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Chepurnov, A., Cicalò, C., Cocco, A. G., Covone, G., D'Angelo, D., D'Incecco, M., D'Urso, D., Davini, S., De Candia, A., De Cecco, S., De Deo, M., De Filippis, G., De Rosa, G., De Vincenzi, M., Derbin, A. V., Devoto, A., Di Eusanio, F., Di Pietro, G., Dionisi, C., Downing, M., Edkins, E., Empl, A., Fan, A., Fiorillo, G., Fitzpatrick, R. S., Fomenko, K., Franco, D., Gabriele, F., Galbiati, C., Ghiano, C., Giagu, S., Giganti, C., Giovanetti, G. K., Gorchakov, O., Goretti, A. M., Granato, F., Gromov, M., Guan, M., Guardincerri, Y., Gulino, M., Hackett, B. R., Herner, K., Hosseini, B., Hughes, D., Humble, P., Hungerford, E. V., Ianni, An., Ippolito, V., James, I., Johnson, T. N., Keeter, K., Kendziora, C. L., Kochanek, I., Koh, G., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lissia, M., Longo, G., Ma, Y., Machado, A. A., Machulin, I. N., Mandarano, A., Mapelli, L., Mari, S. M., Maricic, J., Martoff, C. J., Messina, A., Meyers, P. D., Milincic, R., Monte, A., Morrocchi, M., Mount, B. J., Muratova, V. N., Musico, P., Agasson, A. Navrer, Nozdrina, A. O., Oleinik, A., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pelczar, K., Pelliccia, N., Pocar, A., Pordes, S., Poudel, S. S., Pugachev, D. A., Qian, H., Ragusa, F., Razeti, M., Razeto, A., Reinhold, B., Renshaw, A. L., Rescigno, M., Riffard, Q., Romani, A., Rossi, B., Rossi, N., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Savarese, C., Schlitzer, B., Segreto, E., Semenov, D. A., Shchagin, A., Sheshukov, A., Singh, P. N., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stanford, C., Stracka, S., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Trinchese, P., Unzhakov, E. V., Verducci, M., Vishneva, A., Vogelaar, B., Wada, M., Waldrop, T. J., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wojcik, M. M., Xiang, X., Xiao, X., Yang, C., Ye, Z., Zhu, C., and Zuzel, G.
Subjects: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: The DarkSide-50 direct-detection dark matter experiment is a dual-phase argon time projection chamber operating at Laboratori Nazionali del Gran Sasso. This paper reports on the blind analysis of a (16,660+-270) kg d exposure using a target of low-radioactivity argon extracted from underground sources. We find no events in the dark matter selection box and set a 90% C.L. upper limit on the dark matter-nucleon spin-independent cross section of 1.14E-44 cm^2 (3.78E-44 cm^2, 3.43E-43 cm^2) for a WIMP mass of 100 GeV/c^2 (1 TeV/c^2, 10 TeV/c^2)., Comment: 17 pages, 13 figures. V3 changes: updates for clarity for publication, additional figure
Published: 2018
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39. Constraints on Sub-GeV Dark Matter-Electron Scattering from the DarkSide-50 Experiment

Author: The DarkSide Collaboration, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Araujo, G. R., Asner, D. M., Ave, M., Back, H. O., Baldin, B., Batignani, G., Biery, K., Bocci, V., Bonfini, G., Bonivento, W., Bottino, B., Budano, F., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Canci, N., Candela, A., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Cereseto, R., Chepurnov, A., Cicalò, C., Cifarelli, L., Cocco, A. G., Covone, G., D'Angelo, D., D'Incecco, M., D'Urso, D., Davini, S., De Candia, A., De Cecco, S., De Deo, M., De Filippis, G., De Rosa, G., De Vincenzi, M., Demontis, P., Derbin, A. V., Devoto, A., Di Eusanio, F., Di Pietro, G., Dionisi, C., Downing, M., Edkins, E., Empl, A., Fan, A., Fiorillo, G., Fomenko, K., Franco, D., Gabriele, F., Gabrieli, A., Galbiati, C., Abia, P. Garcia, Ghiano, C., Giagu, S., Giganti, C., Giovanetti, G. K., Gorchakov, O., Goretti, A. M., Granato, F., Gromov, M., Guan, M., Guardincerri, Y., Gulino, M., Hackett, B. R., Hassanshahi, M. H., Herner, K., Hosseini, B., Hughes, D., Humble, P., Hungerford, E. V., Ianni, Al., Ianni, An., Ippolito, V., James, I., Johnson, T. N., Kahn, Y., Keeter, K., Kendziora, C. L., Kochanek, I., Koh, G., Korablev, D., Korga, G., Kubankin, A., Kuss, M., La Commara, M., Lai, M., Li, X., Lisanti, M., Lissia, M., Loer, B., Longo, G., Ma, Y., Machado, A. A., Machulin, I. N., Mandarano, A., Mapelli, L., Mari, S. M., Maricic, J., Martoff, C. J., Messina, A., Meyers, P. D., Milincic, R., Mishra-Sharma, S., Monte, A., Morrocchi, M., Mount, B. J., Muratova, V. N., Musico, P., Nania, R., Agasson, A. Navrer, Nozdrina, A. O., Oleinik, A., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pazzona, F., Pelczar, K., Pelliccia, N., Pesudo, V., Picciau, E., Pocar, A., Pordes, S., Poudel, S. S., Pugachev, D. A., Qian, H., Ragusa, F., Razeti, M., Razeto, A., Reinhold, B., Renshaw, A. L., Rescigno, M., Riffard, Q., Romani, A., Rossi, B., Rossi, N., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Sant, M., Santorelli, R., Savarese, C., Scapparone, E., Schlitzer, B., Segreto, E., Semenov, D. A., Shchagin, A., Sheshukov, A., Singh, P. N., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stanford, C., Stracka, S., Suffritti, G. B., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Trinchese, P., Unzhakov, E. V., Verducci, M., Vishneva, A., Vogelaar, B., Wada, M., Waldrop, T. J., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wojcik, M. M., Wojcik, M., Xiang, X., Xiao, X., Yang, C., Ye, Z., Zhu, C., Zichichi, A., and Zuzel, G.
Subjects: Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We present new constraints on sub-GeV dark matter particles scattering off electrons in argon based on an analysis of ionization signal data from the DarkSide-50 detector., Comment: replaced with published version
Published: 2018
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40. Electroluminescence pulse shape and electron diffusion in liquid argon measured in a dual-phase TPC

Author: Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Asner, D. M., Ave, M. P., Back, H. O., Baldin, B., Batignani, G., Biery, K., Bocci, V., Bonfini, G., Bonivento, W., Bossa, M., Bottino, B., Budano, F., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Caminata, A., Canci, N., Candela, A., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Chepurnov, A., Cicalo, C., Cocco, A. G., Covone, G., D'Angelo, D., D'Incecco, M., D'Urso, D., Davini, S., De Candia, A., De Cecco, S., De Deo, M., De Filippis, G., De Rosa, G., De Vincenzi, M., Demontis, P., Derbin, A. V., Devoto, A., Di Eusanio, F., Di Pietro, G., Dionisi, C., Edkins, E., Fan, A., Fiorillo, G., Fomenko, K., Franco, D., Gabriele, F., Gabrieli, A., Galbiati, C., Giagu, S., Giganti, C., Giovanetti, G. K., Goretti, A. M., Granato, F., Gromov, M., Guan, M., Guardinbcerri, Y., Gulino, M., Hackett, B. R., Herner, K., Hughes, D., Humble, P., Hungerford, E. V., Ianni, An., James, I., Johnson, T. N., Keeter, K., Kendziora, C. L., Koh, G., Korablev, D., Korga, G., Kubankin, A., Kuss, M., Li, X., Lissia, M., Loer, B., Longo, G., Ma, Y., Machado, A. A., Machulin, I. N., Mandarano, A., Mari, S. M., Maricic, J., Martoff, C. J., Messina, A., Meyers, P. D., Milincic, R., Monte, A., Morrocchi, M., Mount, B. J., Muratova, V. N., Musico, P., Agasson, A. Navrer, Nozdrina, A., Oleinik, A., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Pandola, L., Pantic, E., Paoloni, E., Pazzona, F., Pelczar, K., Pelliccia, N., Pocar, A., Pordes, S., Qian, H., Razeti, M., Razeto, A., Reinhold, B., Renshaw, A. L., Rescigno, M., Riffard, Q., Romani, A., Rossi, B., Rossi, N., Sablone, D., Samoylov, O., Sands, W., Sanfilippo, S., Sant, M., Savarese, C., Schlitzer, B., Segreto, E., Semenov, D. A., Sheshukov, A., Singh, P. N., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stanford, C., Suffritti, G. B., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Trinchese, P., Unzhakov, E. V., Verducci, M., Vishneva, A., Vogelaar, B., Wada, M., Waldrop, T. J., Walker, S., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wojcik, M. M., Xiang, X., Xiao, X., Yang, C., Ye, Z., Zhu, C., and Zuzel, G.
Subjects: Physics - Instrumentation and Detectors
Abstract: We report the measurement of the longitudinal diffusion constant in liquid argon with the DarkSide-50 dual-phase time projection chamber. The measurement is performed at drift electric fields of 100 V/cm, 150 V/cm, and 200 V/cm using high statistics $^{39}$Ar decays from atmospheric argon. We derive an expression to describe the pulse shape of the electroluminescence signal (S2) in dual-phase TPCs. The derived S2 pulse shape is fit to events from the uppermost portion of the TPC in order to characterize the radial dependence of the signal. The results are provided as inputs to the measurement of the longitudinal diffusion constant DL, which we find to be (4.12 $\pm$ 0.04) cm$^2$/s for a selection of 140keV electron recoil events in 200V/cm drift field and 2.8kV/cm extraction field. To study the systematics of our measurement we examine datasets of varying event energy, field strength, and detector volume yielding a weighted average value for the diffusion constant of (4.09 $\pm$ 0.09) cm$^2$ /s. The measured longitudinal diffusion constant is observed to have an energy dependence, and within the studied energy range the result is systematically lower than other results in the literature.
Published: 2018
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41. Charge reconstruction in large-area photomultipliers

Author: Grassi, M., Montuschi, M., Baldoncini, M., Mantovani, F., Ricci, B., Andronico, G., Antonelli, V., Bellato, M., Bernieri, E., Brigatti, A., Brugnera, R., Budano, A., Buscemi, M., Bussino, S., Caruso, R., Chiesa, D., Corti, D., Corso, F. Dal, Ding, X. F., Dusini, S., Fabbri, A., Fiorentini, G., Ford, R., Formozov, A., Galet, G., Garfagnini, A., Giammarchi, M., Giaz, A., Insolia, A., Isocrate, R., Lippi, I., Longhitano, F., Presti, D. Lo, Lombardi, P., Marini, F., Mari, S. M., Martellini, C., Meroni, E., Mezzetto, M., Miramonti, L., Monforte, S., Nastasi, M., Ortica, F., Paoloni, A., Parmeggiano, S., Pedretti, D., Pelliccia, N., Pompilio, R., Previtali, E., Ranucci, G., Re, A. C., Romani, A., Saggese, P., Salamanna, G., Sawy, F. H., Settanta, G., Sisti, M., Sirignano, C., Spinetti, M., Stanco, L., Strati, V., Verde, G., and Votano, L.
Subjects: Physics - Instrumentation and Detectors
Abstract: Large-area PhotoMultiplier Tubes (PMT) allow to efficiently instrument Liquid Scintillator (LS) neutrino detectors, where large target masses are pivotal to compensate for neutrinos' extremely elusive nature. Depending on the detector light yield, several scintillation photons stemming from the same neutrino interaction are likely to hit a single PMT in a few tens/hundreds of nanoseconds, resulting in several photoelectrons (PEs) to pile-up at the PMT anode. In such scenario, the signal generated by each PE is entangled to the others, and an accurate PMT charge reconstruction becomes challenging. This manuscript describes an experimental method able to address the PMT charge reconstruction in the case of large PE pile-up, providing an unbiased charge estimator at the permille level up to 15 detected PEs. The method is based on a signal filtering technique (Wiener filter) which suppresses the noise due to both PMT and readout electronics, and on a Fourier-based deconvolution able to minimize the influence of signal distortions ---such as an overshoot. The analysis of simulated PMT waveforms shows that the slope of a linear regression modeling the relation between reconstructed and true charge values improves from $0.769 \pm 0.001$ (without deconvolution) to $0.989 \pm 0.001$ (with deconvolution), where unitary slope implies perfect reconstruction. A C++ implementation of the charge reconstruction algorithm is available online at http://www.fe.infn.it/CRA .
Published: 2018
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42. Observation of the thunderstorm-related ground cosmic ray flux variations by ARGO-YBJ

Author: Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., Amone, A. D, Luobu, Danzeng, De Mitri, I., Piazzoli, B. D Ettorre, Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gao, W., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Ren, Labaci, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Ren, Zhaxici, Zhu, Zhaxisang, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., and Alessandro, F. D.
Subjects: Astrophysics - Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract: A correlation between the secondary cosmic ray flux and the near-earth electric field intensity, measured during thunderstorms, has been found by analyzing the data of the ARGO-YBJ experiment, a full coverage air shower array located at the Yangbajing Cosmic Ray Laboratory (4300 m a. s. l., Tibet, China). The counting rates of showers with different particle multiplicities, have been found to be strongly dependent upon the intensity and polarity of the electric field measured during the course of 15 thunderstorms. In negative electric fields (i.e. accelerating negative charges downwards), the counting rates increase with increasing electric field strength. In positive fields, the rates decrease with field intensity until a certain value of the field EFmin (whose value depends on the event multiplicity), above which the rates begin increasing. By using Monte Carlo simulations, we found that this peculiar behavior can be well described by the presence of an electric field in a layer of thickness of a few hundred meters in the atmosphere above the detector, which accelerates/decelerates the secondary shower particles of opposite charge, modifying the number of particles with energy exceeding the detector threshold. These results, for the first time, give a consistent explanation for the origin of the variation of the electron/positron flux observed for decades by high altitude cosmic ray detectors during thunderstorms., Comment: 17 pages, 11 figures. The paper has been accepted by PRD
Published: 2017
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43. The Electronics, Trigger and Data Acquisition System for the Liquid Argon Time Projection Chamber of the DarkSide-50 Search for Dark Matter

Author: DarkSide Collaboration, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Arisaka, K., Asner, D. M., Ave, M., Back, H. O., Baldin, B., Biery, K., Bocci, V., Bonfini, G., Bonivento, W., Bossa, M., Bottino, B., Brigatti, A., Brodsky, J., Budano, F., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Canci, N., Candela, A., Cao, H., Caravati, M., Cariello, M., Carlini, M., Catalanotti, S., Cataudella, V., Cavalcante, P., Chepurnov, A., Cicaló, C., Cocco, A. G., Covone, G., Crippa, L., D'Angelo, D., D'Incecco, M., Davini, S., deCandia, A., DeCecco, S., DeDeo, M., DeFilippis, G., DeRosa, G., DeVincenzi, M., Derbin, A., Devoto, A., DiEusanio, F., Dionisi, C., DiPietro, G., Edkins, E., Empl, A., Fan, A., Fiorillo, G., Fomenko, K., Forster, G., Franco, D., Gabriele, F., Galbiat, C., Giagu, S., Giganti, C., Giovanetti, G. K., Goretti, A. M., Granato, F., Grandi, L., Gromov, M., Guan, M., Guardincerri, Y., Hackett, B. R., Herner, K. R., Hughes, D., Humble, P., Hungerford, E. V., Ianni, Aldo, Ianni, Andrea, James, I., Johnson, T. N., Keeter, K., Kendziora, C. L., Kobychev, V., Koh, G., Korablev, D., Korga, G., Kubankin, A., Li, X., Lissia, M., Loer, B., Lombardi, P., Longo, G., Luitz, S., Ma, Y., Machado, A., Machulin, I. N., Mandarano, A., Mari, S. M., Maricic, J., Marini, L., Martoff, C. J., Meyers, P. D., Miletic, T., Milincic, R., Montanari, D., Monte, A., Montuschi, M., Monzani, M. E., Mosteiro, P., Mount, B. J., Muratova, V. N., Musico, P., NavrerAgasson, A., Nelson, A., Odrowsk, S., Oleinik, A., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Pantic, E., Parmeggiano, S., Pelczar, K., Pelliccia, N., Pocar, A., Pordes, S., Pugachev, D. A., Qian, H., Randle, K., Ranucci, G., Razeti, M., Razeto, A., Reinhold, B., Renshaw, A. L., Rescigno, M., Riffard, Q., Romani, A., Rossi, B., Rossi, N., Rountree, S. D., Sablone, D., Saggese, P., Saldanha, R., Sands, W., Sangiorgio, S., Savarese, C., Schlitzer, B., Segreto, E., Semenov, D. A., Shields, E., Singh, P. N., Skorokhvatov, M. D., Smirno, O., Sotnikov, A., Stanford, C., Suvorov, Y., Tartaglia, R., Tatarowicz, J., Testera, G., Tonazzo, A., Trinchese, P., Unzhakov, E. V., Verducci, M., Vishneva, A., Vogelaar, R. B., Wada, M., Walker, S., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wojcik, M. M., Xiang, X., Xiao, X., Xu, J., Yang, C., Yoo, J., Zavatarelli, S., Zec, A., Zhong, W., Zhu, C., and Zuzel, G.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: The DarkSide-50 experiment at the Laboratori Nazionali del Gran Sasso is a search for dark matter using a dual phase time projection chamber with 50 kg of low radioactivity argon as target. Light signals from interactions in the argon are detected by a system of 38 photo-multiplier tubes (PMTs), 19 above and 19 below the TPC volume inside the argon cryostat. We describe the electronics which processes the signals from the photo-multipliers, the trigger system which identifies events of interest, and the data-acquisition system which records the data for further analysis. The electronics include resistive voltage dividers on the PMTs, custom pre-amplifiers mounted directly on the PMT voltage dividers in the liquid argon, and custom amplifier/discriminators (at room temperature). After amplification, the PMT signals are digitized in CAEN waveform digitizers, and CAEN logic modules are used to construct the trigger, the data acquisition system for the TPC is based on the Fermilab "artdaq" software. The system has been in operation since early 2014., Comment: 24 pages
Published: 2017
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44. DarkSide-20k: A 20 Tonne Two-Phase LAr TPC for Direct Dark Matter Detection at LNGS

Author: Aalseth, C. E., Acerbi, F., Agnes, P., Albuquerque, I. F. M., Alexander, T., Alici, A., Alton, A. K., Antonioli, P., Arcelli, S., Ardito, R., Arnquist, I. J., Asner, D. M., Ave, M., Back, H. O., Olmedo, A. I. Barrado, Batignani, G., Bertoldo, E., Bettarini, S., Bisogni, M. G., Bocci, V., Bondar, A., Bonfini, G., Bonivento, W., Bossa, M., Bottino, B., Boulay, M., Bunker, R., Bussino, S., Buzulutskov, A., Cadeddu, M., Cadoni, M., Caminata, A., Canci, N., Candela, A., Cantini, C., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Castellani, A., Catalanotti, S., Cataudella, V., Cavalcante, P., Cavuoti, S., Cereseto, R., Chepurnov, A., Cicalò, C., Cifarelli, L., Citterio, M., Cocco, A. G., Colocci, M., Corgiolu, S., Covone, G., Crivelli, P., D'Antone, I., D'Incecco, M., D'Urso, D., Rolo, M. D. Da Rocha, Daniel, M., Davini, S., de Candia, A., De Cecco, S., De Deo, M., De Filippis, G., De Guido, G., De Rosa, G., Dellacasa, G., Della Valle, M., Demontis, P., Derbin, A., Devoto, A., Di Eusanio, F., Di Pietro, G., Dionisi, C., Dolgov, A., Dormia, I., Dussoni, S., Empl, A., Diaz, M. Fernandez, Ferri, A., Filip, C., Fiorillo, G., Fomenko, K., Franco, D., Froudakis, G. E., Gabriele, F., Gabrieli, A., Galbiati, C., Abia, P. Garcia, Gendotti, A., Ghisi, A., Giagu, S., Giampa, P., Gibertoni, G., Giganti, C., Giorgi, M. A., Giovanetti, G. K., Gligan, M. L., Gola, A., Gorchakov, O., Goretti, A. M., Granato, F., Grassi, M., Grate, J. W., Grigoriev, G. Y., Gromov, M., Guan, M., Guerra, M. B. B., Guerzoni, M., Gulino, M., Haaland, R. K., Hallin, A., Harrop, B., Hoppe, E. W., Horikawa, S., Hosseini, B., Hughes, D., Humble, P., Hungerford, E. V., Ianni, An., Jillings, C., Johnson, T. N., Keeter, K., Kendziora, C. L., Kim, S., Koh, G., Korablev, D., Korga, G., Kubankin, A., Kuss, M., Kuźniak, M., Lehnert, B., Li, X., Lissia, M., Lodi, G. U., Loer, B., Longo, G., Loverre, P., Lussana, R., Luzzi, L., Ma, Y., Machado, A. A., Machulin, I. N., Mandarano, A., Mapelli, L., Marcante, M., Margotti, A., Mari, S. M., Mariani, M., Maricic, J., Martoff, C. J., Mascia, M., Mayer, M., McDonald, A. B., Messina, A., Meyers, P. D., Milincic, R., Moggi, A., Moioli, S., Monroe, J., Monte, A., Morrocchi, M., Mount, B. J., Mu, W., Muratova, V. N., Murphy, S., Musico, P., Nania, R., Agasson, A. Navrer, Nikulin, I., Nosov, V., Nozdrina, A. O., Nurakhov, N. N., Oleinik, A., Oleynikov, V., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Palmas, S., Pandola, L., Pantic, E., Paoloni, E., Paternoster, G., Pavletcov, V., Pazzona, F., Peeters, S., Pelczar, K., Pellegrini, L. A., Pelliccia, N., Perotti, F., Perruzza, R., Fortes, V. Pesudo, Piemonte, C., Pilo, F., Pocar, A., Pollmann, T., Portaluppi, D., Pugachev, D. A., Qian, H., Radics, B., Raffaelli, F., Ragusa, F., Razeti, M., Razeto, A., Regazzoni, V., Regenfus, C., Reinhold, B., Renshaw, A. L., Rescigno, M., Retière, F., Riffard, Q., Rivetti, A., Rizzardini, S., Romani, A., Romero, L., Rossi, B., Rossi, N., Rubbia, A., Sablone, D., Salatino, P., Samoylov, O., García, E. Sánchez, Sands, W., Sant, M., Santorelli, R., Savarese, C., Scapparone, E., Schlitzer, B., Scioli, G., Segreto, E., Seifert, A., Semenov, D. A., Shchagin, A., Shekhtman, L., Shemyakina, E., Sheshukov, A., Simeone, M., Singh, P. N., Skensved, P., Skorokhvatov, M. D., Smirnov, O., Sobrero, G., Sokolov, A., Sotnikov, A., Speziale, F., Stainforth, R., Stanford, C., Suffritti, G. B., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Tosi, A., Trinchese, P., Unzhakov, E. V., Vacca, A., Vázquez-Jáuregui, E., Verducci, M., Viant, T., Villa, F., Vishneva, A., Vogelaar, B., Wada, M., Wahl, J., Walding, J., Walker, S., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Williams, R., Wojcik, M. M., Wu, S., Xiang, X., Xiao, X., Yang, C., Ye, Z., de Llano, A. Yllera, Zappa, F., Zappalà, G., Zhu, C., Zichichi, A., Zullo, M., and Zullo, A.
Subjects: Physics - Instrumentation and Detectors
Abstract: Building on the successful experience in operating the DarkSide-50 detector, the DarkSide Collaboration is going to construct DarkSide-20k, a direct WIMP search detector using a two-phase Liquid Argon Time Projection Chamber (LArTPC) with an active (fiducial) mass of 23 t (20 t). The DarkSide-20k LArTPC will be deployed within a shield/veto with a spherical Liquid Scintillator Veto (LSV) inside a cylindrical Water Cherenkov Veto (WCV). Operation of DarkSide-50 demonstrated a major reduction in the dominant $^{39}$Ar background when using argon extracted from an underground source, before applying pulse shape analysis. Data from DarkSide-50, in combination with MC simulation and analytical modeling, shows that a rejection factor for discrimination between electron and nuclear recoils of $\gt3\times10^9$ is achievable. This, along with the use of the veto system, is the key to unlocking the path to large LArTPC detector masses, while maintaining an "instrumental background-free" experiment, an experiment in which less than 0.1 events (other than $\nu$-induced nuclear recoils) is expected to occur within the WIMP search region during the planned exposure. DarkSide-20k will have ultra-low backgrounds than can be measured in situ. This will give sensitivity to WIMP-nucleon cross sections of $1.2\times10^{-47}$ cm$^2$ ($1.1\times10^{-46}$ cm$^2$) for WIMPs of $1$ TeV$/c^2$ ($10$ TeV$/c^2$) mass, to be achieved during a 5 yr run producing an exposure of 100 t yr free from any instrumental background. DarkSide-20k could then extend its operation to a decade, increasing the exposure to 200 t yr, reaching a sensitivity of $7.4\times10^{-48}$ cm$^2$ ($6.9\times10^{-47}$ cm$^2$) for WIMPs of $1$ TeV$/c^2$ ($10$ TeV$/c^2$) mass.
Published: 2017
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45. Simulation of argon response and light detection in the DarkSide-50 dual phase TPC

Author: The DarkSide Collaboration, Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Asner, D. M., Back, H. O., Biery, K., Bocci, V., Bonfini, G., Bonivento, W., Bossa, M., Bottino, B., Budano, F., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Canci, N., Candela, A., Caravati, M., Cariello, M., Carlini, M., Catalanotti, S., Cataudella, V., Cavalcante, P., Chepurnov, A., Cicalo, C., Cocco, A. G., Covone, G., D'Angelo, D., D'Incecco, M., Davini, S., de Candia, A., De Cecco, S., De Deo, M., De Filippis, G., De Vincenzi, M., Derbin, A. V., De Rosa, G., Devoto, A., Di Eusanio, F., Di Pietro, G., Dionisi, C., Edkins, E., Empl, A., Fan, A., Fiorillo, G., Fomenko, K., Franco, D., Gabriele, F., Galbiati, C., Giagu, S., Giganti, C., Giovanetti, G. K., Goretti, A. M., Granato, F., Gromov, M., Guan, M., Guardincerri, Y., Hackett, B. R., Herner, K., Hughes, D., Humble, P., Hungerford, E. V., Ianni, An., James, I., Johnson, T. N., Keeter, K., Kendziora, C. L., Koh, G., Korablev, D., Korga, G., Kubankin, A., Li, X., Lissia, M., Loer, B., Longo, G., Ma, Y., Machado, A. A., Machulin, I. N., Mandarano, A., Mari, S. M., Maricic, J., Martoff, C. J., Meyers, P. D., Milincic, R., Monte, A., Mount, B. J., Muratova, V. N., Musico, P., Napolitano, J., Agasson, A. Navrer, Oleinik, A., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Pantic, E., Pelczar, K., Pelliccia, N., Pocar, A., Pordes, S., Pugachev, D. A., Qian, H., Randle, K., Razeti, M., Razeto, A., Reinhold, B., Renshaw, A. L., Rescigno, M., Riffard, Q., Romani, A., Rossi, B., Rossi, N., Sablone, D., Sands, W., Sanfilippo, S., Savarese, C., Schlitzer, B., Segreto, E., Semenov, D. A., Singh, P. N., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stanford, C., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Trinchese, P., Unzhakov, E. V., Verducci, M., Vishneva, A., Vogelaar, B., Wada, M., Walker, S., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wilhelmi, J., Wojcik, M. M., Xiang, X., Xiao, X., Yang, C., Ye, Z., Zhu, C., and Zuzel, G.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: A Geant4-based Monte Carlo package named G4DS has been developed to simulate the response of DarkSide-50, an experiment operating since 2013 at LNGS, designed to detect WIMP interactions in liquid argon. In the process of WIMP searches, DarkSide-50 has achieved two fundamental milestones: the rejection of electron recoil background with a power of ~10^7, using the pulse shape discrimination technique, and the measurement of the residual 39Ar contamination in underground argon, ~3 orders of magnitude lower with respect to atmospheric argon. These results rely on the accurate simulation of the detector response to the liquid argon scintillation, its ionization, and electron-ion recombination processes. This work provides a complete overview of the DarkSide Monte Carlo and of its performance, with a particular focus on PARIS, the custom-made liquid argon response model., Comment: 29 pages, 23 figures, 1 table
Published: 2017
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46. EAS age determination from the study of the lateral distribution of charged particles near the shower axis with the ARGO-YBJ experiment

Author: Collaboration, ARGO-YBJ, Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, De Mitri, I., Piazzoli, B. D'Ettorre, Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., and Zhu, Q. Q.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract: The ARGO-YBJ experiment, a full coverage extensive air shower (EAS) detector located at high altitude (4300 m a.s.l.) in Tibet, China, has smoothly taken data, with very high stability, since November 2007 to the beginning of 2013. The array consisted of a carpet of about 7000 m$^2$ Resistive Plate Chambers (RPCs) operated in streamer mode and equipped with both digital and analog readout, providing the measurement of particle densities up to few particles per cm$^2$. The unique detector features (full coverage, readout granularity, wide dynamic range, etc) and location (very high altitude) allowed a detailed study of the lateral density profile of charged particles at ground very close to the shower axis and its description by a proper lateral distribution function (LDF). In particular, the information collected in the first 10 m from the shower axis have been shown to provide a very effective tool for the determination of the shower development stage ("age") in the energy range 50 TeV - 10 PeV. The sensitivity of the age parameter to the mass composition of primary Cosmic Rays is also discussed.
Published: 2017
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47. Cryogenic Characterization of FBK RGB-HD SiPMs

Author: Aalseth, C. E., Acerbi, F., Agnes, P., Albuquerque, I. F. M., Alexander, T., Alici, A., Alton, A. K., Ampudia, P., Antonioli, P., Arcelli, S., Ardito, R., Arnquist, I. J., Asner, D. M., Back, H. O., Batignani, G., Bertoldo, E., Bettarini, S., Bisogni, M. G., Bocci, V., Bondar, A., Bonfini, G., Bonivento, W., Bossa, M., Bottino, B., Bunker, R., Bussino, S., Buzulutskov, A., Cadeddu, M., Cadoni, M., Caminata, A., Canci, N., Candela, A., Cantini, C., Caravati, M., Cariello, M., Carlini, M., Carpinelli, M., Castellani, A., Catalanotti, S., Cataudella, V., Cavalcante, P., Cereseto, R., Chen, Y., Chepurnov, A., Chiavassa, A., Cicalò, C., Cifarelli, L., Citterio, M., Cocco, A. G., Colocci, M., Corgiolu, S., Covone, G., Crivelli, P., D'Antone, I., D'Incecco, M., Rolo, M. D. Da Rocha, Daniel, M., Davini, S., De Candia, A., De Cecco, S., De Deo, M., De Filippis, G., De Guido, G., De Rosa, G., Dellacasa, G., Demontis, P., Derbin, A. V., Devoto, A., Di Eusanio, F., Di Pietro, G., Dionisi, C., Dolgov, A., Dormia, I., Dussoni, S., Empl, A., Ferri, A., Filip, C., Fiorillo, G., Fomenko, K., Franco, D., Froudakis, G. E., Gabriele, F., Gabrieli, A., Galbiati, C., Abia, P. Garcia, Gendotti, A., Ghisi, A., Giagu, S., Gibertoni, G., Giganti, C., Giorgi, M., Giovanetti, G. K., Gligan, M. L., Gola, A., Gorchakov, O., Goretti, A. M., Granato, F., Grassi, M., Grate, J. W., Grigoriev, G. Y., Gromov, M., Guan, M., Guerra, M. B. B., Guerzoni, M., Gulino, M., Haaland, R. K., Harrop, B., Hoppe, E. W., Horikawa, S., Hosseini, B., Hughes, D., Humble, P., Hungerford, E. V., Ianni, An., Cabre, S. Jimenez, Johnson, T. N., Keeter, K., Kendziora, C. L., Kim, S., Koh, G., Korablev, D., Korga, G., Kubankin, A., Kugathasan, R., Kuss, M., Li, X., Lissia, M., Lodi, G. U., Loer, B., Longo, G., Lussana, R., Luzzi, L., Ma, Y., Machado, A. A., Machulin, I. N., Mais, L., Mandarano, A., Mapelli, L., Marcante, M., Margotti, A., Mari, S. M., Mariani, M., Maricic, J., Marinelli, M., Marras, D., Martoff, C. J., Mascia, M., Messina, A., Meyers, P. D., Milincic, R., Moggi, A., Moioli, S., Monasterio, S., Monroe, J., Monte, A., Morrocchi, M., Mu, W., Muratova, V. N., Murphy, S., Musico, P., Nania, R., Napolitano, J., Agasson, A. Navrer, Nikulin, I., Nosov, V., Nozdrina, A. O., Nurakhov, N. N., Oleinik, A., Oleynikov, V., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Palmas, S., Pandola, L., Pantic, E., Paoloni, E., Paternoster, G., Pavletcov, V., Pazzona, F., Pelczar, K., Pellegrini, L. A., Pelliccia, N., Perotti, F., Perruzza, R., Piemonte, C., Pilo, F., Pocar, A., Portaluppi, D., Poudel, S. S., Pugachev, D. A., Qian, H., Radics, B., Raffaelli, F., Ragusa, F., Randle, K., Razeti, M., Razeto, A., Regazzoni, V., Regenfus, C., Reinhold, B., Renshaw, A. L., Rescigno, M., Riffard, Q., Rivetti, A., Romani, A., Romero, L., Rossi, B., Rossi, N., Rubbia, A., Sablone, D., Salatino, P., Samoylov, O., Sands, W., Sant, M., Santorelli, R., Savarese, C., Scapparone, E., Schlitzer, B., Scioli, G., Sechi, E., Segreto, E., Seifert, A., Semenov, D. A., Serci, S., Shchagin, A., Shekhtman, L., Shemyakina, E., Sheshukov, A., Simeone, M., Singh, P. N., Skorokhvatov, M. D., Smirnov, O., Sobrero, G., Sokolov, A., Sotnikov, A., Stanford, C., Suffritti, G. B., Suvorov, Y., Tartaglia, R., Testera, G., Tonazzo, A., Tosi, A., Trinchese, P., Unzhakov, E. V., Vacca, A., Verducci, M., Viant, T., Villa, F., Vishneva, A., Vogelaar, B., Wada, M., Wahl, J., Walker, S., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wilhelmi, J., Williams, R., Wojcik, M. M., Wu, S., Xiang, X., Xiao, X., Yang, C., Ye, Z., Zappa, F., Zappalà, G., Zhu, C., Zichichi, A., and Zuzel, G.
Subjects: Physics - Instrumentation and Detectors
Abstract: We report on the cryogenic characterization of Red Green Blue - High Density (RGB-HD) SiPMs developed at Fondazione Bruno Kessler (FBK) as part of the DarkSide program of dark matter searches with liquid argon time projection chambers. A dedicated setup was used to measure the primary dark noise, the correlated noise, and the gain of the SiPMs at varying temperatures. A custom-made data acquisition system and analysis software were used to precisely characterize these parameters. We demonstrate that FBK RGB-HD SiPMs with low quenching resistance (RGB-HD-LR$_q$) can be operated from 40 K to 300 K with gains in the range $10^5$ to $10^6$ and noise rates on the order of a few Hz/mm$^2$.
Published: 2017
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48. Search for Gamma Ray Bursts with the ARGO-YBJ Detector in Shower Mode

Author: Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., Amone, A. D, Luobu, Danzeng, De Mitri, I., Piazzoli, B. D Ettorre, Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gao, W., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Ren, Labaci, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Ren, Zhaxici, Zhu, Zhaxisang, Zhou, X. X., Zhu, F. R., and Zhu, Q. Q.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract: The ARGO-YBJ detector, located at the Yangbajing Cosmic Ray Laboratory (4300 m a. s. l., Tibet, China), was a full coverage air shower array dedicated to gamma ray astronomy and cosmic ray studies. The wide field of view (~ 2 sr) and high duty cycle (> 86%), made ARGO-YBJ suitable to search for short and unexpected gamma ray emissions like gamma ray bursts (GRBs). Between 2007 November 6 and 2013 February 7, 156 satellite-triggered GRBs (24 of them with known redshift) occurred within the ARGO-YBJ field of view. A search for possible emission associated to these GRBs has been made in the two energy ranges 10-100 GeV and 10-1000 GeV. No significant excess has been found in time coincidence with the satellite detections nor in a time window of one hour after the bursts. Taking into account the EBL absorption, upper limits to the energy fluence at 99% of confidence level have been evaluated,with values ranging from ~ 10-5 erg cm-2 to ~10-1 erg cm-2., Comment: 24pages and 12 figures
Published: 2017
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49. CALIS - a CALibration Insertion System for the DarkSide-50 dark matter search experiment

Author: Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Asner, D. M., Back, H. O., Baldin, B., Biery, K., Bocci, V., Bonfini, G., Bonivento, W., Bossa, M., Bottino, B., Brigatti, A., Brodsky, J., Budano, F., Bussino, S., Cadeddu, M., Cadonati, L., Cadoni, M., Calaprice, F., Canci, N., Candela, A., Caravati, M., Cariello, M., Carlini, M., Catalanotti, S., Cavalcante, P., Chepurnov, A., Cicalo, C., Cocco, A. G., Covone, G., D'Angelo, D., D'Incecco, M., Davini, S., De Cecco, S., De Deo, M., De Vincenzi, M., Derbin, A., Devoto, A., Di Eusanio, F., Di Pietro, G., Dionisi, C., Edkins, E., Empl, A., Fan, A., Fiorillo, G., Fomenko, K., Forster, G., Franco, D., Gabriele, F., Galbiati, C., Giagu, S., Giganti, C., Giovanetti, G. K., Goretti, A. M., Granato, F., Grandi, L., Gromov, M., Guan, M., Guardincerri, Y., Hackett, B. R., Herner, K., Hughes, D., Humble, P., Hungerford, E. V., Ianni, Al., Ianni, An., James, I., Johnson, T. N., Jollet, C., Keeter, K., Kendziora, C. L., Koh, G., Korablev, D., Korga, G., Kubankin, A., Li, X., Lissia, M., Loer, B., Lombardi, P., Longo, G., Ma, Y., Machulin, I. N., Mandarano, A., Mari, S. M., Maricic, J., Marini, L., Martoff, C. J., Meregaglia, A., Meyers, P. D., Milincic, R., Miller, J. D., Montanari, D., Monte, A., Mount, B. J., Muratova, V. N., Musico, P., Napolitano, J., Agasson, A. Navrer, Odrowski, S., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Pantic, E., Parmeggiano, S., Pelczar, K., Pelliccia, N., Pocar, A., Pordes, S., Pugachev, D. A., Qian, H., Randle, K., Ranucci, G., Razeti, M., Razeto, A., Reinhold, B., Renshaw, A. L., Rescigno, M., Riffard, Q., Romani, A., Rossi, B., Rossi, N., Rountree, D., Sablone, D., Saggese, P., Saldanha, R., Sands, W., Savarese, C., Schlitzer, B., Segreto, E., Semenova, D. A., Shields, E., Singh, P. N., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stanford, C., Suvorov, Y., Tartaglia, R., Tatarowicz, J., Testera, G., Tonazzo, A., Trinchese, P., Unzhakov, E. V., Verducci, M., Vishneva, A., Vogelaar, B., Wada, M., Walker, S., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wilhelmi, J., Wojcik, M. M., Xiang, Xi., Xiao, X., Xu, J., Yang, C., Zec, A., Zhong, W., Zhu, C., and Zuzel, G.
Subjects: Physics - Instrumentation and Detectors
Abstract: This paper describes the design, fabrication, commissioning and use of a CALibration source Insertion System (CALIS) in the DarkSide-50 direct dark matter search experiment. CALIS deploys radioactive sources into the liquid scintillator veto to characterize the detector response and detection efficiency of the DarkSide-50 Liquid Argon Time Projection Chamber, and the surrounding 30 t organic liquid scintillator neutron veto. It was commissioned in September 2014 and has been used successfully in several gamma and neutron source campaigns since then. A description of the hardware and an excerpt of calibration analysis results are given below., Comment: 21 pages, 11 figures
Published: 2016
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50. Effect of Low Electric Fields on Alpha Scintillation Light Yield in Liquid Argon

Author: Agnes, P., Albuquerque, I. F. M., Alexander, T., Alton, A. K., Asner, D. M., Back, H. O., Baldin, B., Biery, K., Bocci, V., Bonfini, G., Bonivento, W., Bossa, M., Bottino, B., Brigatti, A., Brodsky, J., Budano, F., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., Canci, N., Candela, A., Caravati, M., Cariello, M., Carlini, M., Catalanotti, S., Cavalcante, P., Chepurnov, A., Cicalò, C., Cocco, A. G., Covone, G., D'Angelo, D., D'Incecco, M., Davini, S., De Cecco, S., De Deo, M., De Vincenzi, M., Derbin, A., Devoto, A., Di Eusanio, F., Di Pietro, G., Dionisi, C., Edkins, E., Empl, A., Fan, A., Fiorillo, G., Fomenko, K., Forster, G., Franco, D., Gabriele, F., Galbiati, C., Giagu, S., Giganti, C., Giovanetti, G. K., Goretti, A. M., Granato, F., Gromov, M., Guan, M., Guardincerri, Y., Hackett, B. R., Herner, K., Hughes, D., Humble, P., Hungerford, E. V., Ianni, A., James, I., Johnson, T. N., Jollet, C., Keeter, K., Kendziora, C. L., Koh, G., Korablev, D., Korga, G., Kubankin, A., Li, X., Lissia, M., Loer, B., Lombardi, P., Longo, G., Ma, Y., Machulin, I. N., Mandarano, A., Mari, S. M., Maricic, J., Marini, L., Martoff, C. J., Meregaglia, A., Meyers, P. D., Milincic, R., Miller, J. D., Montanari, D., Monte, A., Mount, B. J., Muratova, V. N., Musico, P., Napolitano, J., Agasson, A. Navrer, Odrowski, S., Oleinik, A., Orsini, M., Ortica, F., Pagani, L., Pallavicini, M., Pantic, E., Parmeggiano, S., Pelczar, K., Pelliccia, N., Pocar, A., Pordes, S., Pugachev, D. A., Qian, H., Randle, K., Ranucci, G., Razeti, M., Razeto, A., Reinhold, B., Renshaw, A. L., Rescigno, M., Riffard, Q., Romani, A., Rossi, B., Rossi, N., Rountree, D., Sablone, D., Saggese, P., Sands, W., Savarese, C., Schlitzer, B., Segreto, E., Semenov, D. A., Shields, E., Singh, P. N., Skorokhvatov, M. D., Smirnov, O., Sotnikov, A., Stanford, C., Suvorov, Y., Tartaglia, R., Tatarowicz, J., Testera, G., Tonazzo, A., Trinchese, P., Unzhakov, E. V., Verducci, M., Vishneva, A., Vogelaar, B., Wada, M., Walker, S., Wang, H., Wang, Y., Watson, A. W., Westerdale, S., Wilhelmi, J., Wojcik, M. M., Xiang, X., Xiao, X., Xu, J., Yang, C., Zhong, W., Zhu, C., and Zuzel, G.
Subjects: Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract: Measurements were made of scintillation light yield of alpha particles from the $^{222}$Rn decay chain within the DarkSide-50 liquid argon time projection chamber. The light yield was found to increase as the applied electric field increased, with alphas in a 200 V/cm electric field exhibiting a 2% increase in light yield compared to alphas in no field., Comment: 5 pages, 5 figures
Published: 2016
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