Author: "Almazán, H." - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Almazán, H."' showing total 124 results

Start Over Author "Almazán, H."

124 results on '"Almazán, H."'

1. Measurement of Energy Resolution with the NEXT-White Silicon Photomultipliers

Author: Contreras, T., Palmeiro, B., Almazán, H., Para, A., Martínez-Lema, G., Guenette, R., Adams, C., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Auria-Luna, F., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., del Barrio-Torregrosa, M., Bayo, A., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Brodolin, A., Byrnes, N., Cárcel, S., Castillo, A., Cebrián, S., Church, E., Cid, L., Conde, C. A. N., Cossío, F. P., Dey, E., Díaz, G., Dickel, T., Echevarria, C., Elorza, M., Escada, J., Esteve, R., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freixa, Z., García-Barrena, J., Gómez-Cadenas, J. J., González, R., Grocott, J. W. R., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero-Gómez, P., Herrero, V., Carrete, C. Hervés, Ifergan, Y., Jones, B. J. P., Kellerer, F., Larizgoitia, L., Larumbe, A., Lebrun, P., Lopez, F., López-March, N., Madigan, R., Mano, R. D. P., Marques, A. P., Martín-Albo, J., Martínez-Vara, M., Miller, R. L., Mistry, K., Molina-Canteras, J., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Navarro, K. E., Novella, P., Nuñez, A., Nygren, D. R., Oblak, E., Palacio, J., Parmaksiz, I., Pazos, A., Pelegrin, J., Maneiro, M. Pérez, Querol, M., Redwine, A. B., Renner, J., Rivilla, I., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Seemann, M., Shomroni, I., Silva, P. A. O. C., Simón, A., Soleti, S. R., Sorel, M., Soto-Oton, J., Teixeira, J. M. R., Teruel-Pardo, S., Toledo, J. F., Tonnelé, C., Torrent, J., Trettin, A., Usón, A., Valle, P. R. G., Veloso, J. F. C. A., Waiton, J., and Yubero-Navarro, A.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: The NEXT-White detector, a high-pressure gaseous xenon time projection chamber, demonstrated the excellence of this technology for future neutrinoless double beta decay searches using photomultiplier tubes (PMTs) to measure energy and silicon photomultipliers (SiPMs) to extract topology information. This analysis uses $^{83m}\text{Kr}$ data from the NEXT-White detector to measure and understand the energy resolution that can be obtained with the SiPMs, rather than with PMTs. The energy resolution obtained of (10.9 $\pm$ 0.6) $\%$, full-width half-maximum, is slightly larger than predicted based on the photon statistics resulting from very low light detection coverage of the SiPM plane in the NEXT-White detector. The difference in the predicted and measured resolution is attributed to poor corrections, which are expected to be improved with larger statistics. Furthermore, the noise of the SiPMs is shown to not be a dominant factor in the energy resolution and may be negligible when noise subtraction is applied appropriately, for high-energy events or larger SiPM coverage detectors. These results, which are extrapolated to estimate the response of large coverage SiPM planes, are promising for the development of future, SiPM-only, readout planes that can offer imaging and achieve similar energy resolution to that previously demonstrated with PMTs.
Published: 2024

2. Fluorescence Imaging of Individual Ions and Molecules in Pressurized Noble Gases for Barium Tagging in $^{136}$Xe

Author: NEXT Collaboration, Byrnes, N., Dey, E., Foss, F. W., Jones, B. J. P., Madigan, R., McDonald, A., Miller, R. L., Navarro, K. E., Norman, L. R., Nygren, D. R., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Auria-Luna, F., Ayet, S., Azevedo, C. D. R., Barcelon, J. E., Bailey, K., Ballester, F., del Barrio-Torregrosa, M., Bayo, A., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Brodolin, A., Cárcel, S., Castillo, A., Cebrián, S., Church, E., Cid, L., Conde, C. A. N., Contreras, T., Cossío, F. P., Díaz, G., Dickel, T., Echevarria, C., Elorza, M., Escada, J., Esteve, R., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Freixa, Z., García-Barrena, J., Gómez-Cadenas, J. J., González, R., Grocott, J. W. R., Guenette, R., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero-Gómez, P., Herrero, V., Carrete, C. Hervés, Ho, P., Ifergan, Y., Kellerer, F., Larizgoitia, L., Larumbe, A., Lebrun, P., Lopez, F., López-March, N., Mano, R. D. P., Marques, A. P., Martín-Albo, J., Martínez-Lema, G., Martínez-Vara, M., Mistry, K., Molina-Canteras, J., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Novella, P., Nuñez, A., Oblak, E., Palacio, J., Palmeiro, B., Para, A., Parmaksiz, I., Pazos, A., Pelegrin, J., Maneiro, M. Pérez, Querol, M., Redwine, A. B., Renner, J., Rivilla, I., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Seemann, M., Shomroni, I., Silva, P. A. O. C., Simón, A., Soleti, S. R., Sorel, M., Soto-Oton, J., Teixeira, J. M. R., Teruel-Pardo, S., Toledo, J. F., Tonnelé, C., Torrent, J., Trettin, A., Usón, A., Valle, P. R. G., Veloso, J. F. C. A., Waiton, J., and Yubero-Navarro, A.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: The imaging of individual Ba$^{2+}$ ions in high pressure xenon gas is one possible way to attain background-free sensitivity to neutrinoless double beta decay and hence establish the Majorana nature of the neutrino. In this paper we demonstrate selective single Ba$^{2+}$ ion imaging inside a high-pressure xenon gas environment. Ba$^{2+}$ ions chelated with molecular chemosensors are resolved at the gas-solid interface using a diffraction-limited imaging system with scan area of 1$\times$1~cm$^2$ located inside 10~bar of xenon gas. This new form of microscopy represents an important enabling step in the development of barium tagging for neutrinoless double beta decay searches in $^{136}$Xe, as well as a new tool for studying the photophysics of fluorescent molecules and chemosensors at the solid-gas interface.
Published: 2024

3. Design, characterization and installation of the NEXT-100 cathode and electroluminescence regions

Author: NEXT Collaboration, Mistry, K., Rogers, L., Jones, B. J. P., Munson, B., Norman, L., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Auria-Luna, F., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., del Barrio-Torregrosa, M., Bayo, A., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Brodolin, A., Byrnes, N., Cárcel, S., Castillo, A., Cebrián, S., Church, E., Cid, L., Conde, C. A. N., Contreras, T., Cossío, F. P., Dey, E., Díaz, G., Dickel, T., Echevarria, C., Elorza, M., Escada, J., Esteve, R., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freitas, E. D. C., Freixa, Z., Gómez-Cadenas, J. J., González, R., Grocott, J. W. R., Guenette, R., Hafidi, K., Hauptman, J., Henriques, C. A. O., Hernando~Morata, J. A., Herrero-Gómez, P., Herrero, V., Carrete, C. Hervés, Ifergan, Y., Larizgoitia, L., Larumbe, A., Lebrun, P., Lopez, F., López-March, N., Madigan, R., Mano, R. D. P., Marques, A. P., Martín-Albo, J., Martínez-Lema, G., Martínez-Vara, M., Meziani, Z. E., Miller, R. L., Molina-Canteras, J., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Navarro, K. E., Novella, P., Nuñez, A., Nygren, D. R., Oblak, E., Oliver, D., Palacio, J., Palmeiro, B., Para, A., Parmaksiz, I., Pelegrin, J., Maneiro, M. Pérez, Querol, M., Redwine, A. B., Renner, J., Rivilla, I., Rogero, C., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Seemann, M., Shomroni, I., Simón, A., Soleti, S. R., Sorel, M., Soto-Oton, J., Teixeira, J. M. R., Toledo, J. F., Torrent, J., Trettin, A., Usón, A., Veloso, J. F. C. A., Waiton, J., and Yubero, A.
Subjects: Physics - Instrumentation and Detectors
Abstract: NEXT-100 is currently being constructed at the Laboratorio Subterr\'aneo de Canfranc in the Spanish Pyrenees and will search for neutrinoless double beta decay using a high-pressure gaseous time projection chamber (TPC) with 100 kg of xenon. Charge amplification is carried out via electroluminescence (EL) which is the process of accelerating electrons in a high electric field region causing secondary scintillation of the medium proportional to the initial charge. The NEXT-100 EL and cathode regions are made from tensioned hexagonal meshes of 1 m diameter. This paper describes the design, characterization, and installation of these parts for NEXT-100. Simulations of the electric field are performed to model the drift and amplification of ionization electrons produced in the detector under various EL region alignments and rotations. Measurements of the electrostatic breakdown voltage in air characterize performance under high voltage conditions and identify breakdown points. The electrostatic deflection of the mesh is quantified and fit to a first-principles mechanical model. Measurements were performed with both a standalone test EL region and with the NEXT-100 EL region before its installation in the detector. Finally, we describe the parts as installed in NEXT-100, following their deployment in Summer 2023., Comment: 35 pages, 25 Figures, update includes accepted version in JINST
Published: 2023
Full Text: View/download PDF

4. Demonstration of Event Position Reconstruction based on Diffusion in the NEXT-White Detector

Author: Haefner, J., Navarro, K. E., Guenette, R., Jones, B. J. P., Tripathi, A., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Auria-Luna, F., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., del Barrio-Torregrosa, M., Bayo, A., BenllochRodríguez, J. M., Borges, F. I. G. M., Brodolin, A., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Cid, L., Conde, C. A. N., Contreras, T., Cossío, F. P., Dey, E., Díaz, G., Dickel, T., Elorza, M., Escada, J., Esteve, R., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freitas, E. D. C., Freixa, Z., Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J. J., González, R., Grocott, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero-Gómez, P., Herrero, V., Carrete, C. Hervés, Ifergan, Y., Labarga, L., Larizgoitia, L., Larumbe, A., Lebrun, P., Lopez, F., López-March, N., Madigan, R., Mano, R. D. P., Marques, A. P., Martín-Albo, J., Martínez-Lema, G., Martínez-Vara, M., Meziani, Z. E., Miller, R. L., Mistry, K., Molina-Canteras, J., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Vidal, J. Muñoz, Novella, P., Nuñez, A., Nygren, D. R., Oblak, E., Palacio, J., Palmeiro, B., Para, A., Parmaksiz, I., Pelegrin, J., Maneiro, M. Pérez, Querol, M., Redwine, A. B., Renner, J., Rivilla, I., Rodríguez, J., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Shomroni, I., Simón, A., Soleti, S. R., Sorel, M., Soto-Oton, J., Teixeira, J. M. R., Toledo, J. F., Torrent, J., Trettin, A., Usón, A., Veloso, J. F. C. A., Waiton, J., and White, J. T.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: Noble element time projection chambers are a leading technology for rare event detection in physics, such as for dark matter and neutrinoless double beta decay searches. Time projection chambers typically assign event position in the drift direction using the relative timing of prompt scintillation and delayed charge collection signals, allowing for reconstruction of an absolute position in the drift direction. In this paper, alternate methods for assigning event drift distance via quantification of electron diffusion in a pure high pressure xenon gas time projection chamber are explored. Data from the NEXT-White detector demonstrate the ability to achieve good position assignment accuracy for both high- and low-energy events. Using point-like energy deposits from $^{83\mathrm{m}}$Kr calibration electron captures ($E\sim45$keV), the position of origin of low-energy events is determined to $2~$cm precision with bias $< 1$mm. A convolutional neural network approach is then used to quantify diffusion for longer tracks (E$\geq$1.5MeV), yielding a precision of 3cm on the event barycenter. The precision achieved with these methods indicates the feasibility energy calibrations of better than 1% FWHM at Q$_{\beta\beta}$ in pure xenon, as well as the potential for event fiducialization in large future detectors using an alternate method that does not rely on primary scintillation., Comment: 18 pages, 16 figures
Published: 2023

5. Demonstration of event position reconstruction based on diffusion in the NEXT-white detector

Author: Haefner, J, Navarro, KE, Guenette, R, Jones, BJP, Tripathi, A, Adams, C, Almazán, H, Álvarez, V, Aparicio, B, Aranburu, AI, Arazi, L, Arnquist, IJ, Auria-Luna, F, Ayet, S, Azevedo, CDR, Bailey, K, Ballester, F, Barrio-Torregrosa, M del, Bayo, A, Benlloch-Rodríguez, JM, Borges, FIGM, Brodolin, A, Byrnes, N, Cárcel, S, Carrión, JV, Cebrián, S, Church, E, Cid, L, Conde, CAN, Contreras, T, Cossío, FP, Dey, E, Díaz, G, Dickel, T, Elorza, M, Escada, J, Esteve, R, Felkai, R, Fernandes, LMP, Ferrario, P, Ferreira, AL, Foss, FW, Freitas, EDC, Freixa, Z, Generowicz, J, Goldschmidt, A, Gómez-Cadenas, JJ, González, R, Grocott, J, Hafidi, K, Hauptman, J, Henriques, CAO, Morata, JA Hernando, Herrero-Gómez, P, Herrero, V, Hervés Carrete, C, Ifergan, Y, Labarga, L, Larizgoitia, L, Larumbe, A, Lebrun, P, Lopez, F, López-March, N, Madigan, R, Mano, RDP, Marques, AP, Martín-Albo, J, Martínez-Lema, G, Martínez-Vara, M, Meziani, ZE, Miller, RL, Mistry, K, Molina-Canteras, J, Monrabal, F, Monteiro, CMB, Mora, FJ, Muñoz Vidal, J, Novella, P, Nuñez, A, Nygren, DR, Oblak, E, Palacio, J, Palmeiro, B, Para, A, Parmaksiz, I, Pelegrin, J, Pérez Maneiro, M, Querol, M, Redwine, AB, Renner, J, Rivilla, I, Rodríguez, J, Rogero, C, Rogers, L, Romeo, B, Romo-Luque, C, Santos, FP, dos Santos, JMF, Shomroni, I, and Simón, A
Subjects: Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: Noble element time projection chambers are a leading technology for rare event detection in physics, such as for dark matter and neutrinoless double beta decay searches. Time projection chambers typically assign event position in the drift direction using the relative timing of prompt scintillation and delayed charge collection signals, allowing for reconstruction of an absolute position in the drift direction. In this paper, alternate methods for assigning event drift distance via quantification of electron diffusion in a pure high pressure xenon gas time projection chamber are explored. Data from the NEXT-White detector demonstrate the ability to achieve good position assignment accuracy for both high- and low-energy events. Using point-like energy deposits from 83mKr calibration electron captures (E∼45 keV), the position of origin of low-energy events is determined to 2 cm precision with bias
Published: 2024

6. Demonstration of neutrinoless double beta decay searches in gaseous xenon with NEXT

Author: NEXT Collaboration, Novella, P., Sorel, M., Usón, A., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Auria-Luna, F., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., del Barrio-Torregrosa, M., Bayo, A., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Bounasser, S., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Cid, L., Conde, C. A. N., Contreras, T., Cossío, F. P., Dey, E., Díaz, G., Dickel, T., Elorza, M., Escada, J., Esteve, R., Fahs, A., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freitas, E. D. C., Freixa, Z., Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J. J., González, R., Grocott, J., Guenette, R., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero-Gómez, P., Herrero, V., Carrete, C. Hervés, Ho, J., Ho, P., Ifergan, Y., Jones, B. J. P., Labarga, L., Larizgoitia, L., Larumbe, A., Lebrun, P., Lopez, F., Gutierrez, D. Lopez, López-March, N., Madigan, R., Mano, R. D. P., Marques, A. P., Martín-Albo, J., Martínez-Lema, G., Martínez-Vara, M., Meziani, Z. E., Miller, R. L., Mistry, K., Molina-Canteras, J., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Vidal, J. Muñoz, Navarro, K. E., Nuñez, A., Nygren, D. R., Oblak, E., Odriozola-Gimeno, M., Palacio, J., Palmeiro, B., Para, A., Parmaksiz, I., Pelegrin, J., Maneiro, M. Pérez, Querol, M., Redwine, A. B., Renner, J., Rivilla, I., Rodríguez, J., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Simón, A., Soleti, S. R., Stanford, C., Teixeira, J. M. R., Toledo, J. F., Torrent, J., Veloso, J. F. C. A., Vuong, T. T., Waiton, J., and White, J. T.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: The NEXT experiment aims at the sensitive search of the neutrinoless double beta decay in $^{136}$Xe, using high-pressure gas electroluminescent time projection chambers. The NEXT-White detector is the first radiopure demonstrator of this technology, operated in the Laboratorio Subterr\'aneo de Canfranc. Achieving an energy resolution of 1% FWHM at 2.6 MeV and further background rejection by means of the topology of the reconstructed tracks, NEXT-White has been exploited beyond its original goals in order to perform a neutrinoless double beta decay search. The analysis considers the combination of 271.6 days of $^{136}$Xe-enriched data and 208.9 days of $^{136}$Xe-depleted data. A detailed background modeling and measurement has been developed, ensuring the time stability of the radiogenic and cosmogenic contributions across both data samples. Limits to the neutrinoless mode are obtained in two alternative analyses: a background-model-dependent approach and a novel direct background-subtraction technique, offering results with small dependence on the background model assumptions. With a fiducial mass of only 3.50$\pm$0.01 kg of $^{136}$Xe-enriched xenon, 90% C.L. lower limits to the neutrinoless double beta decay are found in the T$_{1/2}^{0\nu}>5.5\times10^{23}-1.3\times10^{24}$ yr range, depending on the method. The presented techniques stand as a proof-of-concept for the searches to be implemented with larger NEXT detectors.
Published: 2023
Full Text: View/download PDF

7. NEXT-CRAB-0: A High Pressure Gaseous Xenon Time Projection Chamber with a Direct VUV Camera Based Readout

Author: NEXT Collaboration, Byrnes, N. K., Parmaksiz, I., Adams, C., Asaadi, J., Baeza-Rubio, J, Bailey, K., Church, E., González-Díaz, D., Higley, A., Jones, B. J. P., Mistry, K., Moya, I. A., Nygren, D. R., Oyedele, P., Rogers, L., Stogsdill, K., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Ayet, S., Azevedo, C. D. R., Ballester, F., del Barrio-Torregrosa, M., Bayo, A., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Bounasser, S., Cárcel, S., Carrión, J. V., Cebrián, S., Cid, L., Conde, C. A. N., Contreras, T., Cossío, F. P., Dey, E., Díaz, G., Dickel, T., Elorza, M., Escada, J., Esteve, R., Fahs, A., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freitas, E. D. C., Freixa, Z., Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J. J., González, R., Grocott, J., Guenette, R., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero-Gómez, P., Herrero, V., Carrete, C. Hervés, Ho, J., Ho, P., Ifergan, Y., Labarga, L., Larizgoitia, L., Lebrun, P., Lopez, F, Gutierrez, D. Lopez, López-March, N., Madigan, R., Mano, R. D. P., Marques, A. P., Martín-Albo, J., Martínez-Lema, G., Martínez-Vara, M., Meziani, Z. E., Miller, R. L., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Vidal, J. Muñoz, Navarro, K. E., Novella, P., Nuñez, A., Oblak, E., Odriozola-Gimeno, M., Palacio, J., Palmeiro, B., Para, A., Pelegrin, J, Maneiro, M. Pérez, Querol, M., Redwine, A. B., Renner, J., Rivilla, I., Rodríguez, J., Rogero, C., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Simón, A., Soleti, S. R., Sorel, M., Stanford, C., Teixeira, J. M. R., Toledo, J. F., Torrent, J., Usón, A., Veloso, J. F. C. A., Vuong, T. T., Waiton, J., and White, J. T.
Subjects: Physics - Instrumentation and Detectors
Abstract: The search for neutrinoless double beta decay ($0\nu\beta\beta$) remains one of the most compelling experimental avenues for the discovery in the neutrino sector. Electroluminescent gas-phase time projection chambers are well suited to $0\nu\beta\beta$ searches due to their intrinsically precise energy resolution and topological event identification capabilities. Scalability to ton- and multi-ton masses requires readout of large-area electroluminescent regions with fine spatial resolution, low radiogenic backgrounds, and a scalable data acquisition system. This paper presents a detector prototype that records event topology in an electroluminescent xenon gas TPC via VUV image-intensified cameras. This enables an extendable readout of large tracking planes with commercial devices that reside almost entirely outside of the active medium.Following further development in intermediate scale demonstrators, this technique may represent a novel and enlargeable method for topological event imaging in $0\nu\beta\beta$., Comment: 30 Pages, 22 figures, Updated to match current JINST submission
Published: 2023

8. A Compact Dication Source for Ba$^{2+}$ Tagging and Heavy Metal Ion Sensor Development

Author: Navarro, K. E., Jones, B. J. P., Baeza-Rubio, J., Boyd, M., Denisenko, A. A., Foss, F. W., Giri, S., Miller, R., Nygren, D. R., Tiscareno, M. R., Samaniego, F. J., Stogsdill, K., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Bounasser, S., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Conde, C. A. N., Contreras, T., Cossío, F. P., Dey, E., Díaz, G., Dickel, T., Escada, J., Esteve, R., Fahs, A., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Freitas, E. D. C., Freixa, Z., Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J. J., González, R., Grocott, J., Guenette, R., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero-Gómez, P., Herrero, V., Carrete, C. Hervés, Ho, J., Ho, P., Ifergan, Y., Labarga, L., Larizgoitia, L., Lebrun, P., Gutierrez, D. Lopez, López-March, N., Madigan, R., Mano, R. D. P., Marques, A. P., Martín-Albo, J., Martínez-Lema, G., Martínez-Vara, M., Meziani, Z. E., Mistry, K., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Vidal, J. Muñoz, Novella, P., Nuñez, A., Oblak, E., Odriozola-Gimeno, M., Palmeiro, B., Para, A., Pelegrín, J., Maneiro, M. Pérez, Querol, M., Redwine, A. B., Renner, J., Rivilla, I., Rodríguez, J., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Simón, A., Sorel, M., Stanford, C., Teixeira, J. M. R., Toledo, J. F., Torrent, J., Usón, A., Veloso, J. F. C. A., Vuong, T. T., Waiton, J., and White, J. T.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: We present a tunable metal ion beam that delivers controllable ion currents in the picoamp range for testing of dry-phase ion sensors. Ion beams are formed by sequential atomic evaporation and single or multiple electron impact ionization, followed by acceleration into a sensing region. Controllability of the ionic charge state is achieved through tuning of electrode potentials that influence the retention time in the ionization region. Barium, lead, and cobalt samples have been used to test the system, with ion currents identified and quantified using a quadrupole mass analyzer. Realization of a clean $\mathrm{Ba^{2+}}$ ion beam within a bench-top system represents an important technical advance toward the development and characterization of barium tagging systems for neutrinoless double beta decay searches in xenon gas. This system also provides a testbed for investigation of novel ion sensing methodologies for environmental assay applications, with dication beams of Pb$^{2+}$ and Cd$^{2+}$ also demonstrated for this purpose.
Published: 2023
Full Text: View/download PDF

9. Reflectance and fluorescence characteristics of PTFE coated with TPB at visible, UV, and VUV as a function of thickness

Author: Haefner, J, Fahs, A, Ho, J, Stanford, C, Guenette, R, Adams, C, Almazán, H, Álvarez, V, Aparicio, B, Aranburu, AI, Arazi, L, Arnquist, IJ, Auria-Luna, F, Ayet, S, Azevedo, CDR, Bailey, K, Ballester, F, Benlloch-Rodríguez, JM, Borges, FIGM, Bounasser, S, Byrnes, N, Cárcel, S, Carrión, JV, Cebrián, S, Church, E, Conde, CAN, Contreras, T, Cossío, FP, Denisenko, AA, Dey, E, Díaz, G, Dickel, T, Escada, J, Esteve, R, Felkai, R, Fernandes, LMP, Ferrario, P, Ferreira, AL, Foss, FW, Freitas, EDC, Freixa, Z, Generowicz, J, Goldschmidt, A, Gómez-Cadenas, JJ, González, R, Grocott, J, Hafidi, K, Hauptman, J, Henriques, CAO, Morata, JA Hernando, Herrero-Gómez, P, Herrero, V, Ho, P, Ifergan, Y, Jones, BJP, Kekic, M, Labarga, L, Larizgoitia, L, Lebrun, P, Gutierrez, D Lopez, López-March, N, Madigan, R, Mano, RDP, Martín-Albo, J, Martínez-Lema, G, Martínez-Vara, M, Marques, AP, Meziani, ZE, Miller, R, Mistry, K, Molina-Canteras, J, Monrabal, F, Monteiro, CMB, Mora, FJ, Vidal, J Muñoz, Navarro, K, Novella, P, Nuñez, A, Nygren, DR, Oblak, E, Odriozola-Gimeno, M, Palmeiro, B, Para, A, Querol, M, Redwine, AB, Renner, J, Rivilla, I, Rodríguez, J, Rogero, C, Rogers, L, Romeo, B, Romo-Luque, C, Santos, FP, dos Santos, JMF, Simón, A, Sorel, M, Teixeira, JMR, Toledo, JF, Torrent, J, and Usón, A
Subjects: Nuclear and Plasma Physics, Physical Sciences, Engineering, Nuclear & Particles Physics, Physical sciences
Abstract: Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely used in light collection systems for particle physics experiments. In noble element systems, it is often coated with tetraphenyl butadiene (TPB) to allow detection of vacuum ultraviolet scintillation light. In this work this dependence is investigated for PTFE coated with TPB in air for light of wavelengths of 200 nm, 260 nm, and 450 nm. The results show that TPB-coated PTFE has a reflectance of approximately 92% for thicknesses ranging from 5 mm to 10 mm at 450 nm, with negligible variation as a function of thickness within this range. A cross-check of these results using an argon chamber supports the conclusion that the change in thickness from 5 mm to 10 mm does not affect significantly the light response at 128 nm. Our results indicate that pieces of TPB-coated PTFE thinner than the typical 10 mm can be used in particle physics detectors without compromising the light signal.
Published: 2023

10. Reflectance and fluorescence characteristics of PTFE coated with TPB at visible, UV, and VUV as a function of thickness

Author: Haefner, J., Fahs, A., Ho, J., Stanford, C., Guenette, R., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Auria-Luna, F., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Bounasser, S., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Conde, C. A. N., Contreras, T., Cossío, F. P., Denisenko, A. A., Dey, E., Díaz, G., Dickel, T., Escada, J., Esteve, R., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freitas, E. D. C., Freixa, Z., Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J. J., González, R., Grocott, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero-Gómez, P., Herrero, V., Ho, P., Ifergan, Y., Jones, B. J. P., Kekic, M., Labarga, L., Larizgoitia, L., Lebrun, P., Gutierrez, D. Lopez, López-March, N., Madigan, R., Mano, R. D. P., Martín-Albo, J., Martínez-Lema, G., Martínez-Vara, M., Marques, A. P., Meziani, Z. E., Miller, R., Mistry, K., Molina-Canteras, J., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Vidal, J. Muñoz, Navarro, K., Novella, P., Nuñez, A., Nygren, D. R., Oblak, E., Odriozola-Gimeno, M., Palmeiro, B., Para, A., Querol, M., Redwine, A. B., Renner, J., Rivilla, I., Rodríguez, J., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Simón, A., Sorel, M., Teixeira, J. M. R., Toledo, J. F., Torrent, J., Usón, A., Veloso, J. F. C. A., Vuong, T. T., and Waiton, J.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Physics - Optics
Abstract: Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely used in light collection systems for particle physics experiments. In noble element systems, it is often coated with tetraphenyl butadiene (TPB) to allow detection of vacuum ultraviolet scintillation light. In this work this dependence is investigated for PTFE coated with TPB in air for light of wavelengths of 200~nm, 260~nm, and 450~nm. The results show that TPB-coated PTFE has a reflectance of approximately 92\% for thicknesses ranging from 5~mm to 10~mm at 450~nm, with negligible variation as a function of thickness within this range. A cross-check of these results using an argon chamber supports the conclusion that the change in thickness from 5~mm to 10~mm does not affect significantly the light response at 128~nm. Our results indicate that pieces of TPB-coated PTFE thinner than the typical 10~mm can be used in particle physics detectors without compromising the light signal.
Published: 2022
Full Text: View/download PDF

11. Stereo neutrino spectrum of 235U fission rejects sterile neutrino hypothesis

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lhuillier, J. Lamblin A. Letourneau D., Licciardi, M., Lindner, M., Materna, T., Pessard, H., Réal, J. -S., Ricol, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., and Vialat, M.
Subjects: High Energy Physics - Experiment
Abstract: Anomalies in past neutrino measurements have led to the discovery that these particles have non-zero mass and oscillate between their three flavors when they propagate. In the 2010's, similar anomalies observed in the antineutrino spectra emitted by nuclear reactors have triggered the hypothesis of the existence of a supplementary neutrino state that would be sterile i.e. not interacting via the weak interaction. The STEREO experiment was designed to study this scientific case that would potentially extend the Standard Model of Particle Physics. Here we present a complete study based on our full set of data with significantly improved sensitivity. Installed at the ILL (Institut Laue Langevin) research reactor, STEREO has accurately measured the antineutrino energy spectrum associated to the fission of 235U. This measurement confirms the anomalies whereas, thanks to the segmentation of the STEREO detector and its very short mean distance to the core (10~m), the same data reject the hypothesis of a light sterile neutrino. Such a direct measurement of the antineutrino energy spectrum suggests instead that biases in the nuclear experimental data used for the predictions are at the origin of the anomalies. Our result supports the neutrino content of the Standard Model and establishes a new reference for the 235U antineutrino energy spectrum. We anticipate that this result will allow to progress towards finer tests of the fundamental properties of neutrinos but also to benchmark models and nuclear data of interest for reactor physics and for observations of astrophysical or geo-neutrinos., Comment: 34 pages, 13 figures. Final version submitted to Nature
Published: 2022
Full Text: View/download PDF

12. Improved FIFRELIN de-excitation model for neutrino applications

Author: Almazan, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., Chebboubi, A., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Litaize, O., Materna, T., Pessard, H., Real, J. -S., Ricol, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., Thulliez, L., and Vialat, M.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: The precise modeling of the de-excitation of Gd isotopes is of great interest for experimental studies of neutrinos using Gd-loaded organic liquid scintillators. The FIFRELIN code was recently used within the purposes of the STEREO experiment for the modeling of the Gd de-excitation after neutron capture in order to achieve a good control of the detection efficiency. In this work, we report on the recent additions in the FIFRELIN de-excitation model with the purpose of enhancing further the de-excitation description. Experimental transition intensities from EGAF database are now included in the FIFRELIN cascades, in order to improve the description of the higher energy part of the spectrum. Furthermore, the angular correlations between {\gamma} rays are now implemented in FIFRELIN, to account for the relative anisotropies between them. In addition, conversion electrons are now treated more precisely in the whole spectrum range, while the subsequent emission of X rays is also accounted for. The impact of the aforementioned improvements in FIFRELIN is tested by simulating neutron captures in various positions inside the STEREO detector. A repository of up-to-date FIFRELIN simulations of the Gd isotopes is made available for the community, with the possibility of expanding for other isotopes which can be suitable for different applications., Comment: Corrected typos on author names on arXiv metadata
Published: 2022
Full Text: View/download PDF

13. The dynamics of ions on phased radio-frequency carpets in high pressure gases and application for barium tagging in xenon gas time projection chambers

Author: Jones, BJP, Raymond, A, Woodruff, K, Byrnes, N, Denisenko, AA, Foss, FW, Navarro, K, Nygren, DR, Vuong, TT, Adams, C, Almazán, H, Álvarez, V, Aparicio, B, Aranburu, AI, Arazi, L, Arnquist, IJ, Ayet, S, Azevedo, CDR, Bailey, K, Ballester, F, Benlloch-Rodríguez, JM, Borges, FIGM, Bounasser, S, Cárcel, S, Carrión, JV, Cebrián, S, Church, E, Conde, CAN, Contreras, T, Cossío, FP, Díaz, G, Díaz, J, Dickel, T, Escada, J, Esteve, R, Fahs, A, Felkai, R, Fernandes, LMP, Ferrario, P, Ferreira, AL, Freitas, EDC, Freixa, Z, Generowicz, J, Goldschmidt, A, Gómez-Cadenas, JJ, González, R, González-Díaz, D, Guenette, R, Gutiérrez, RM, Haefner, J, Hafidi, K, Hauptman, J, Henriques, CAO, Morata, JA Hernando, Herrero-Gómez, P, Herrero, V, Ho, J, Ifergan, Y, Kekic, M, Labarga, L, Laing, A, Lebrun, P, Gutierrez, D Lopez, López-March, N, Losada, M, Mano, RDP, Martín-Albo, J, Martínez, A, Martínez-Lema, G, Martínez-Vara, M, McDonald, AD, Meziani, ZE, Mistry, K, Monrabal, F, Monteiro, CMB, Mora, FJ, Vidal, J Muñoz, Novella, P, Oblak, E, Odriozola-Gimeno, M, Palmeiro, B, Para, A, Pérez, J, Querol, M, Redwine, AB, Renner, J, Ripoll, L, Rivilla, I, García, Y Rodríguez, Rodríguez, J, Rogero, C, Rogers, L, Romeo, B, Romo-Luque, C, Santos, FP, dos Santos, JMF, Simón, A, Sorel, M, Stanford, C, and Teixeira, JMR
Subjects: Nuclear and Plasma Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics, Nuclear and plasma physics
Abstract: Radio-frequency (RF) carpets with ultra-fine pitches are examined for ion transport in gases at atmospheric pressures and above. We develop new analytic and computational methods for modeling RF ion transport at densities where dynamics are strongly influenced by buffer gas collisions. An analytic description of levitating and sweeping forces from phased arrays is obtained, then thermodynamic and kinetic principles are used to calculate ion loss rates in the presence of collisions. This methodology is validated against detailed microscopic SIMION simulations. We then explore a parameter space of special interest for neutrinoless double beta decay experiments: transport of barium ions in xenon at pressures from 1 to 10 bar. Our computations account for molecular ion formation and pressure dependent mobility as well as finite temperature effects. We discuss the challenges associated with achieving suitable operating conditions, which lie beyond the capabilities of existing devices, using presently available or near-future manufacturing techniques.
Published: 2022

14. The Double Chooz antineutrino detectors

Author: Double Chooz Collaboration, de Kerret, H., Abe, Y., Aberle, C., Abrahão, T., Ahijado, J. M., Akiri, T., Alarcón, J. M., Alba, J., Almazan, H., Anjos, J. C. dos, Appel, S., Ardellier, F., Barabanov, I., Barriere, J. C., Baussan, E., Baxter, A., Bekman, I., Bergevin, M., Bernstein, A., Bertoli, W., Bezerra, T. J. C., Bezrukov, L., Blanco, C., Bleurvacq, N., Blucher, E., Bonet, H., Bongrand, M., Bowden, N. S, Brugière, T., Buck, C., Avanzini, M. Buizza, Busenitz, J., Cabrera, A., Calvo, E., Camilleri, L., Carr, R., Cazaux, S., Cela, J. M., Cerrada, M., Chang, P. J., Charon, P., Chauveau, E., Chimenti, P., Classen, T., Collin, A. P., Conover, E., Conrad, J. M, Cormon, S., Corpace, O., Courty, B., Crespo-Anadón, J. I., Cribier, M., Crum, K., Cuadrado, S., Cucoanes, A., D'Agostino, M., Damon, E., Dawson, J. V., Dazeley, S., Dierckxsens, M., Dietrich, D., Djurcic, Z., Dorigo, F., Dracos, M., Durand, V., Efremekov, Y., Elnimr, M., Etenko, A., Falk, E., Fallot, M., Fechner, M., Felde, J., Fernandes, S. M., Fernández-Bedoya, C., Francia, D., Franco, D., Fischer, V., Franke, A. J., Franke, M., Furuta, H., Garcia, F., Garcia, J., Gil-Botella, I., Giot, L., Givaudan, A., Göger-Neff, M., Gomez, H., Gonzalez, L. F. G., Goodenough, L., Goodman, M. C., Goon, J., Gramlich, B., Greiner, D., Guertin, A., Guillon, B., Habib, S. M., Haddad, Y., Hara, T., Hartmann, F. X., Hartnell, J., Haser, J., Hatzikoutelis, A., Hellwig, D., Hervé, S., Hofacker, R., Horton-Smith, G., Hourlier, A., Ishitsuka, M., Jänner, K., Jiménez, S., Jochum, J., Jollet, C., Kaether, F., Kale, K., Kalousis, L., Kamyshkov, Y., Kaneda, M., Kaplan, D. M., Karakac, M., Kawasaki, T., Kemp, E., Kibe, Y., Kirchner, T., Konno, T., Kryn, D., Kutter, T., Kuze, M., Lachenmaier, T., Lane, C. E., Langbrandtner, C., Lasserre, T., Lastoria, C., Latron, L., Leonardo, C., Letourneau, A., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Lucht, S., Maeda, J., Maesano, C. N., Mariani, C., Maricic, J., Marie, F., Martinez, J. J., Martino, J., Matsubara, T., McKee, D., Meigner, F., Mention, G., Meregaglia, A., Meyer, J. P., Miletic, T., Milincic, R., Millot, J. F., Minotti, A., Mirones, V., Miyata, H., Mueller, Th. A., Nagasaka, Y., Nakajima, K., Navas-Nicolás, D., Nikitenko, Y., Novella, P., Oberauer, L., Obolensky, M., Onillon, A., Oralbaev, A., Ostrovskiy, I., Palomares, C., Peeters, S. J. M., Pepe, I. M., Perasso, S., Perrin, P., Pfahler, P., Porta, A., Pronost, G., Puras, J. C., Quéval, R., Ramirez, J. L., Reichenbacher, J., Reinhold, B., Reissfelder, M., Remoto, A., Reyna, D., Rodriguez, I., Röhling, M., Roncin, R., Rudolf, N., Rybolt, B., Sakamoto, Y., Santorelli, R., Sato, F., Schwan, U., Scola, L., Settimo, M., Schönert, S., Schoppmann, S., Shaevitz, M. A., Sharankova, R., Sibille, V., Sida, J. L., Sinev, V., Shrestha, D., Skorokhvatov, M., Soldin, P., Spitz, J., Stahl, A., Stancu, I., Starzynski, P., Stock, M. R., Stokes, L. F. F., Strait, M., Stüken, A., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Sun, Z., Svoboda, R., Tabata, H., Tamura, N., Terao, K., Tonazzo, A., Toral, F., Toups, M., Thi, H. Trinh, Valdivia, F., Valdiviesso, G., Vassilopoulos, N., Verdugo, A., Veyssiere, C., Viaud, B., Vignaud, D., Vivier, M., Wagner, S., Wiebusch, C., White, B., Winslow, L., Worcester, M., Wurm, M., Wurtz, J., Yang, G., Yáñez, J., Yermia, F., and Zbiri, K.
Subjects: Physics - Instrumentation and Detectors
Abstract: This article describes the setup and performance of the near and far detectors in the Double Chooz experiment. The electron antineutrinos of the Chooz nuclear power plant were measured in two identically designed detectors with different average baselines of about 400 m and 1050 m from the two reactor cores. Over many years of data taking the neutrino signals were extracted from interactions in the detectors with the goal of measuring a fundamental parameter in the context of neutrino oscillation, the mixing angle {\theta}13. The central part of the Double Chooz detectors was a main detector comprising four cylindrical volumes filled with organic liquids. From the inside towards the outside there were volumes containing gadolinium-loaded scintillator, gadolinium-free scintillator, a buffer oil and, optically separated, another liquid scintillator acting as veto system. Above this main detector an additional outer veto system using plastic scintillator strips was installed. The technologies developed in Double Chooz were inspiration for several other antineutrino detectors in the field. The detector design allowed implementation of efficient background rejection techniques including use of pulse shape information provided by the data acquisition system. The Double Chooz detectors featured remarkable stability, in particular for the detected photons, as well as high radiopurity of the detector components., Comment: 49 pages, 29 figures
Published: 2022
Full Text: View/download PDF

15. Ba$^{2+}$ ion trapping by organic submonolayer: towards an ultra-low background neutrinoless double beta decay detector

Author: Herrero-Gómez, P., Calupitan, J. P., Ilyn, M., Berdonces-Layunta, A., Wang, T., de Oteyza, D. G., Corso, M., González-Moreno, R., Rivilla, I., Aparicio, B., Aranburu, A. I., Freixa, Z., Monrabal, F., Cossío, F. P., Gómez-Cadenas, J. J., Rogero, C., Adams, C., Almazán, H., Alvarez, V., Arazi, L., Arnquist, I. J., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Bounasser, S., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Conde, C. A. N., Contreras, T., Denisenko, A. A., Díaz, G., Díaz, J., Dickel, T., Escada, J., Esteve, R., Fahs, A., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freitas, E. D. C., Generowicz, J., Goldschmidt, A., González-Díaz, D., Guenette, R., Gutiérrez, R. M., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero, V., Ho, J., Ifergan, Y., Jones, B. J. P., Kekic, M., Labarga, L., Laing, A., Larizgoitia, L., Lebrun, P., Gutierrez, D. Lopez, López-March, N., Losada, M., Mano, R. D. P., Martín-Albo, J., Martínez, A., Martínez-Lema, G., Martínez-Vara, M., McDonald, A. D., Meziani, Z. E., Mistry, K., Monteiro, C. M. B., Mora, F. J., Vidal, J. Muñoz, Navarro, K., Novella, P., Nygren, D. R., Oblak, E., Odriozola-Gimeno, M., Palmeiro, B., Para, A., Pérez, J., Querol, M., Raymond, A., Redwine, A. B., Renner, J., Ripoll, L., García, Y. Rodríguez, Rodríguez, J., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Simón, A., Sorel, M., Stanford, C., Teixeira, J. M. R., Thapa, P., Toledo, J. F., Torrent, J., Usón, A., Veloso, J. F. C. A., Vuong, T. T., Webb, R., White, J. T., Woodruff, K., and Yahlali, N.
Subjects: High Energy Physics - Experiment, Condensed Matter - Materials Science, Physics - Chemical Physics
Abstract: If neutrinos are their own antiparticles, the otherwise-forbidden nuclear reaction known as neutrinoless double beta decay ($\beta\beta 0\nu$) can occur, with a characteristic lifetime which is expected to be very long, making the suppression of backgrounds a daunting task. It has been shown that detecting (``tagging'') the Ba$^{+2}$ dication produced in the double beta decay ${}^{136}\mathrm{Xe} \rightarrow {}^{136}$Ba$^{+2}+ 2 e + (2 \nu)$ in a high pressure gas experiment, could lead to a virtually background free experiment. To identify these \Bapp, chemical sensors are being explored as a key tool by the NEXT collaboration . Although used in many fields, the application of such chemosensors to the field of particle physics is totally novel and requires experimental demonstration of their suitability in the ultra-dry environment of a xenon gas chamber. Here we use a combination of complementary surface science techniques to unambiguously show that Ba$^{+2}$ ions can be trapped (chelated) in vacuum by an organic molecule, the so-called fluorescent bicolour indicator (FBI) (one of the chemosensors developed by NEXT), immobilized on a surface. We unravel the ion capture mechanism once the molecules are immobilised on Au(111) surface and explain the origin of the emission fluorescence shift associated to the trapping of different ions. Moreover, we prove that chelation also takes place on a technologically relevant substrate, as such, demonstrating the feasibility of using FBI indicators as building blocks of a Ba$^{+2}$ detector.
Published: 2022
Full Text: View/download PDF

16. Measurement of the ${}^{136}$Xe two-neutrino double beta decay half-life via direct background subtraction in NEXT

Author: NEXT Collaboration, Novella, P., Sorel, M., Usón, A., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Bounasser, S., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Conde, C. A. N., Contreras, T., Cossío, F. P., Denisenko, A. A., Díaz, G., Díaz, J., Dickel, T., Escada, J., Esteve, R., Fahs, A., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freitas, E. D. C., Freixa, Z., Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J. J., González, R., González-Díaz, D., Guenette, R., Gutiérrez, R. M., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero-Gómez, P., Herrero, V., Ho, J., Ifergan, Y., Jones, B. J. P., Kekic, M., Labarga, L., Laing, A., Larizgoitia, L., Lebrun, P., Gutierrez, D. Lopez, López-March, N., Losada, M., Mano, R. D. P., Martín-Albo, J., Martínez, A., Martínez-Lema, G., Martínez-Vara, M., McDonald, A. D., Meziani, Z. E., Mistry, K., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Vidal, J. Muñoz, Navarro, K., Nygren, D. R., Oblak, E., Odriozola-Gimeno, M., Palmeiro, B., Para, A., Pérez, J., Querol, M., Raymond, A., Redwine, A. B., Renner, J., Ripoll, L., Rivilla, I., García, Y. Rodríguez, Rodríguez, J., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Simón, A., Stanford, C., Teixeira, J. M. R., Thapa, P., Toledo, J. F., Torrent, J., Veloso, J. F. C. A., Vuong, T. T., Webb, R., White, J. T., Woodruff, K., and Yahlali, N.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: We report a measurement of the half-life of the ${}^{136}$Xe two-neutrino double beta decay performed with a novel direct background subtraction technique. The analysis relies on the data collected with the NEXT-White detector operated with ${}^{136}$Xe-enriched and ${}^{136}$Xe-depleted xenon, as well as on the topology of double-electron tracks. With a fiducial mass of only 3.5 kg of Xe, a half-life of $2.34^{+0.80}_{-0.46}\textrm{(stat)}^{+0.30}_{-0.17}\textrm{(sys)}\times10^{21}~\textrm{yr}$ is derived from the background-subtracted energy spectrum. The presented technique demonstrates the feasibility of unique background-model-independent neutrinoless double beta decay searches., Comment: 9 pages, 7 figures, and 1 appendix
Published: 2021
Full Text: View/download PDF

17. Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Méplan, O., Pessard, H., Pignol, G., Réal, J. -S., Ricol, J. -S., Roca, C., Rogly, R., Salagnac, T., Sarrazin, M., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., and Vialat, M.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: Different extensions of the standard model of particle physics, such as braneworld or mirror matter models, predict the existence of a neutron sterile state, possibly as a dark matter candidate. This Letter reports a new experimental constraint on the probability $p$ for neutron conversion into a hidden neutron, set by the STEREO experiment at the high flux reactor of the Institut Laue-Langevin. The limit is $p<3.1\times 10^{-11}$ at $95 \%$ C.L. improving the previous limit by a factor 13. This result demonstrates that short-baseline neutrino experiments can be used as competitive passing-through-walls neutron experiments to search for hidden neutrons., Comment: 5 pages, 3 figures
Published: 2021
Full Text: View/download PDF

18. The Dynamics of Ions on Phased Radio-frequency Carpets in High Pressure Gases and Application for Barium Tagging in Xenon Gas Time Projection Chambers

Author: NEXT Collaboration, Jones, B. J. P., Raymond, A., Woodruff, K., Byrnes, N., Denisenko, A. A., Foss, F. W., Navarro, K., Nygren, D. R., Vuong, T. T., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Bounasser, S., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Conde, C. A. N., Contreras, T., Cossío, F. P., Díaz, G., Díaz, J., Dickel, T., Escada, J., Esteve, R., Fahs, A., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Freitas, E. D. C., Freixa, Z, Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J. J., González, R., González-Díaz, D., Guenette, R., Gutiérrez, R. M., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Hernando~Morata, J. A., Herrero-Gómez, P., Herrero, V., Ho, J., Ifergan, Y., Kekic, M., Labarga, L., Laing, A., Lebrun, P., Gutierrez, D. Lopez, López-March, N., Losada, M., Mano, R. D. P., Martín-Albo, J., Martínez, A., Martínez-Lema, G., Martínez-Vara, M., McDonald, A. D., Meziani, Z. E., Mistry, K., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Vidal, J. Muñoz, Novella, P., Oblak, E., Odriozola-Gimeno, M., Palmeiro, B., Para, A., Pérez, J., Querol, M., Redwine, A. B., Renner, J., Ripoll, L., Rivilla, I., García, Y. Rodríguez, Rodríguez, J., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Simón, A., Sorel, M., Stanford, C., Teixeira, J. M. R., Thapa, P., Toledo, J. F., Torrent, J., Usón, A., Veloso, J. F. C. A., Webb, R., Weiss-Babai, R., White, J. T., and Yahlali, N.
Subjects: Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract: Radio-frequency (RF) carpets with ultra-fine pitches are examined for ion transport in gases at atmospheric pressures and above. We develop new analytic and computational methods for modeling RF ion transport at densities where dynamics are strongly influenced by buffer gas collisions. An analytic description of levitating and sweeping forces from phased arrays is obtained, then thermodynamic and kinetic principles are used to calculate ion loss rates in the presence of collisions. This methodology is validated against detailed microscopic SIMION simulations. We then explore a parameter space of special interest for neutrinoless double beta decay experiments: transport of barium ions in xenon at pressures from 1 to 10 bar. Our computations account for molecular ion formation and pressure dependent mobility as well as finite temperature effects. We discuss the challenges associated with achieving suitable operating conditions, which lie beyond the capabilities of existing devices, using presently available or near-future manufacturing techniques., Comment: 26 pages, 16 figures v2: author list update and pre-journal submission adjustments
Published: 2021

19. Measurement of the Xe136 two-neutrino double-β-decay half-life via direct background subtraction in NEXT

Author: Novella, P, Sorel, M, Usón, A, Adams, C, Almazán, H, Álvarez, V, Aparicio, B, Aranburu, AI, Arazi, L, Arnquist, IJ, Ayet, S, Azevedo, CDR, Bailey, K, Ballester, F, Benlloch-Rodríguez, JM, Borges, FIGM, Bounasser, S, Byrnes, N, Cárcel, S, Carrión, JV, Cebrián, S, Church, E, Conde, CAN, Contreras, T, Cossío, FP, Denisenko, AA, Díaz, G, Díaz, J, Dickel, T, Escada, J, Esteve, R, Fahs, A, Felkai, R, Fernandes, LMP, Ferrario, P, Ferreira, AL, Foss, FW, Freitas, EDC, Freixa, Z, Generowicz, J, Goldschmidt, A, Gómez-Cadenas, JJ, González, R, González-Díaz, D, Guenette, R, Gutiérrez, RM, Haefner, J, Hafidi, K, Hauptman, J, Henriques, CAO, Morata, JA Hernando, Herrero-Gómez, P, Herrero, V, Ho, J, Ifergan, Y, Jones, BJP, Kekic, M, Labarga, L, Laing, A, Larizgoitia, L, Lebrun, P, Gutierrez, D Lopez, López-March, N, Losada, M, Mano, RDP, Martín-Albo, J, Martínez, A, Martínez-Lema, G, Martínez-Vara, M, McDonald, AD, Meziani, ZE, Mistry, K, Monrabal, F, Monteiro, CMB, Mora, FJ, Vidal, J Muñoz, Navarro, K, Nygren, DR, Oblak, E, Odriozola-Gimeno, M, Palmeiro, B, Para, A, Pérez, J, Querol, M, Raymond, A, Redwine, AB, Renner, J, Ripoll, L, Rivilla, I, García, Y Rodríguez, Rodríguez, J, Rogero, C, Rogers, L, Romeo, B, Romo-Luque, C, Santos, FP, dos Santos, JMF, Simón, A, Stanford, C, and Teixeira, JMR
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Nuclear and plasma physics
Abstract: We report a measurement of the half-life of the Xe136 two-neutrino double-β decay performed with a novel direct-background-subtraction technique. The analysis relies on the data collected with the NEXT-White detector operated with Xe136-enriched and Xe136-depleted xenon, as well as on the topology of double-electron tracks. With a fiducial mass of only 3.5 kg of Xe, a half-life of 2.34-0.46+0.80(stat)-0.17+0.30(sys)×1021yr is derived from the background-subtracted energy spectrum. The presented technique demonstrates the feasibility of unique background-model-independent neutrinoless double-β-decay searches.
Published: 2022

20. Joint Measurement of the $^{235}$U Antineutrino Spectrum by Prospect and Stereo

Author: Almazán, H., Andriamirado, M., Balantekin, A. B., Band, H. R., Bass, C. D., Bergeron, D. E., Bernard, L., Blanchet, A., Bonhomme, A., Bowden, N. S., Bryan, C. D., Buck, C., Classen, T., Conant, A. J., Deichert, G., Sanchez, P. del Amo, Delgado, A., Diwan, M. V., Dolinski, M. J., Atmani, I. El, Erickson, A., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gilbert, C. E., Hans, S., Hansell, A. B., Heeger, K. M., Heffron, B., Jaffe, D. E., Jayakumar, S., Ji, X., Jones, D. C., Koblanski, J., Kyzylova, O., Labit, L., Lamblin, J., Lane, C. E., Langford, T. J., LaRosa, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Littlejohn, B. R., Lu, X., Maricic, J., Materna, T., Mendenhall, M. P., Meyer, A. M., Milincic, R., Mueller, P. E., Mumm, H. P., Napolitano, J., Neilson, R., Nikkel, J. A., Nour, S., Palomino, J. L., Pessard, H., Pushin, D. A., Qian, X., Réal, J. -S., Ricol, J. -S., Roca, C., Rogly, R., Rosero, R., Salagnac, T., Savu, V., Schoppmann, S., Searles, M., Sergeyeva, V., Soldner, T., Stutz, A., Surukuchi, P. T., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Vialat, M., Weatherly, P. B., White, C., Wilhelmi, J., Woolverton, A., Yeh, M., Zhang, C., and Zhang, X.
Subjects: Nuclear Experiment, High Energy Physics - Experiment
Abstract: The PROSPECT and STEREO collaborations present a combined measurement of the pure $^{235}$U antineutrino spectrum, without site specific corrections or detector-dependent effects. The spectral measurements of the two highest precision experiments at research reactors are found to be compatible with $\chi^2/\mathrm{ndf} = 24.1/21$, allowing a joint unfolding of the prompt energy measurements into antineutrino energy. This $\bar{\nu}_e$ energy spectrum is provided to the community, and an excess of events relative to the Huber model is found in the 5-6 MeV region. When a Gaussian bump is fitted to the excess, the data-model $\chi^2$ value is improved, corresponding to a $2.4\sigma$ significance.
Published: 2021
Full Text: View/download PDF

21. Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution

Author: Simón, A., Ifergan, Y., Redwine, A. B., Weiss-Babai, R., Arazi, L., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arnquist, I. J., Azevedo, C. D. R, Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Conde, C. A. N., Contreras, T., Cossío, F. P., Denisenko, A. A., Díaz, G., Díaz, J., Escada, J., Esteve, R., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F., Freitas, E. D. C., Freixa, Z., Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J. J., González, R., González-Díaz, D., Gosh, S., Guenette, R., Gutiérrez, R. M., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero, P., Herrero, V., Ho, J., Jones, B. J. P., Kekic, M., Labarga, L., Laing, A., Lebrun, P., López-March, N., Losada, M., Mano, R. D. P., Martín-Albo, J., Martínez, A., Martínez-Vara, M., Martínez-Lema, G., McDonald, A. D., Meziani, Z. -E., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Vidal, J. Muñoz, Newhouse, C., Novella, P., Nygren, D. R., Oblak, E., Odriozola-Gimeno, M., Palmeiro, B., Para, A., Pérez, J., Querol, M., Renner, J., Ripoll, L., Rivilla, I., García, Y. Rodríguez, Rodríguez, J., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Santos, J. M. F. dos, Sorel, M., Stanford, C., Teixeira, J. M. R., Thapa, P., Toledo, J. F., Torrent, J., Usón, A., Veloso, J. F. C. A., Vuong, T. T., Webb, R., White, J. T., Woodruff, K., and Yahlali, N.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: Next-generation neutrinoless double beta decay experiments aim for half-life sensitivities of ~$10^{27}$ yr, requiring suppressing backgrounds to <1 count/tonne/yr. For this, any extra background rejection handle, beyond excellent energy resolution and the use of extremely radiopure materials, is of utmost importance. The NEXT experiment exploits differences in the spatial ionization patterns of double beta decay and single-electron events to discriminate signal from background. While the former display two Bragg peak dense ionization regions at the opposite ends of the track, the latter typically have only one such feature. Thus, comparing the energies at the track extremes provides an additional rejection tool. The unique combination of the topology-based background discrimination and excellent energy resolution (1% FWHM at the Q-value of the decay) is the distinguishing feature of NEXT. Previous studies demonstrated a topological background rejection factor of ~5 when reconstructing electron-positron pairs in the $^{208}$Tl 1.6 MeV double escape peak (with Compton events as background), recorded in the NEXT-White demonstrator at the Laboratorio Subterr\'aneo de Canfranc, with 72% signal efficiency. This was recently improved through the use of a deep convolutional neural network to yield a background rejection factor of ~10 with 65% signal efficiency. Here, we present a new reconstruction method, based on the Richardson-Lucy deconvolution algorithm, which allows reversing the blurring induced by electron diffusion and electroluminescence light production in the NEXT TPC. The new method yields highly refined 3D images of reconstructed events, and, as a result, significantly improves the topological background discrimination. When applied to real-data 1.6 MeV $e^-e^+$ pairs, it leads to a background rejection factor of 27 at 57% signal efficiency., Comment: Submitted to JHEP
Published: 2021
Full Text: View/download PDF

22. First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL

Author: STEREO collaboration, Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Pessard, H., Réal, J. -S., Ricol, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., and Vialat, M.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: This article reports the measurement of the $^{235}$U-induced antineutrino spectrum shape by the STEREO experiment. 43'000 antineutrinos have been detected at about 10 m from the highly enriched core of the ILL reactor during 118 full days equivalent at nominal power. The measured inverse beta decay spectrum is unfolded to provide a pure $^{235}$U spectrum in antineutrino energy. A careful study of the unfolding procedure, including a cross-validation by an independent framework, has shown that no major biases are introduced by the method. A significant local distortion is found with respect to predictions around $E_\nu \simeq 5.3$ MeV. A gaussian fit of this local excess leads to an amplitude of $A = 12.1 \pm 3.4\%$ (3.5$\sigma$)., Comment: This is the Accepted Manuscript version of an article accepted for publication in J. Phys. G: Nucl. Part. Phys.. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6471/abd37a. 34 pages, 14 figures
Published: 2020
Full Text: View/download PDF

23. Search for Signatures of Sterile Neutrinos with Double Chooz

Author: The Double Chooz Collaboration, Abrahão, T., Almazan, H., Anjos, J. C. dos, Appel, S., Barriere, J. C., Bekman, I., Bezerra, T. J. C., Bezrukov, L., Blucher, E., Brugière, T., Buck, C., Busenitz, J., Cabrera, A., Cerrada, M., Chauveau, E., Chimenti, P., Corpace, O., Dawson, J. V., Djurcic, Z., Etenko, A., Furuta, H., Gil-Botella, I., Givaudan, A., Gomez, H., Gonzalez, L. F. G., Goodman, M. C., Hara, T., Haser, J., Hellwig, D., Hourlier, A., Ishitsuka, M., Jochum, J., Jollet, C., Kale, K., Kaneda, M., Karakac, M., Kawasaki, T., Kemp, E., de Kerret, H., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C. E., Lasserre, T., Lastoria, C., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Maeda, J., Mariani, C., Maricic, J., Martino, J., Matsubara, T., Mention, G., Meregaglia, A., Miletic, T., Milincic, R., Minotti, A., Navas-Nicolás, D., Novella, P., Oberauer, L., Obolensky, M., Onillon, A., Oralbaev, A., Palomares, C., Pepe, I. M., Pronost, G., Reichenbacher, J., Reinhold, B., Schönert, S., Schoppmann, S., Scola, L., Sharankova, R., Sibille, V., Sinev, V., Skorokhvatov, M., Soldin, P., Stahl, A., Stancu, I., Stokes, L. F. F., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Veyssiere, C., Viaud, B., Vivier, M., Wagner, S., Wiebusch, C., Yang, G., and Yermia, F.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors, 62F03 (Primary), 62P35, 65C60 (Secondary)
Abstract: We present a search for signatures of neutrino mixing of electron anti-neutrinos with additional hypothetical sterile neutrino flavors using the Double Chooz experiment. The search is based on data from 5 years of operation of Double Chooz, including 2 years in the two-detector configuration. The analysis is based on a profile likelihood, i.e.\ comparing the data to the model prediction of disappearance in a data-to-data comparison of the two respective detectors. The analysis is optimized for a model of three active and one sterile neutrino. It is sensitive in the typical mass range $5 \cdot 10^{-3} $ eV$^2 \lesssim \Delta m^2_{41} \lesssim 3\cdot 10^{-1} $ eV$^2$ for mixing angles down to $\sin^2 2\theta_{14} \gtrsim 0.02$. No significant disappearance additionally to the conventional disappearance related to $\theta_{13} $ is observed and correspondingly exclusion bounds on the sterile mixing parameter $\theta_{14} $ as function of $ \Delta m^2_{41} $ are obtained., Comment: accepted for publication by EPJC
Published: 2020
Full Text: View/download PDF

24. Reactor Rate Modulation oscillation analysis with two detectors in Double Chooz

Author: Double Chooz Collaboration, Abrahão, T., Almazan, H., Anjos, J. C. dos, Appel, S., Bekman, I., Bezerra, T. J. C., Bezrukov, L., Blucher, E., Brugière, T., Buck, C., Busenitz, J., Cabrera, A., Cerrada, M., Chauveau, E., Chimenti, P., Dawson, J. V., Djurcic, Z., Etenko, A., Furuta, H., Gil-Botella, I., Gonzalez, L. F. G., Goodman, M. C., Hara, T., Hellwig, D., Hourlier, A., Ishitsuka, M., Jochum, J., Jollet, C., Kale, K., Kaneda, M., Kawasaki, T., Kemp, E., de Kerret, H., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C. E., Lasserre, T., Lastoria, C., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Maeda, J., Mariani, C., Maricic, J., Martino, J., Matsubara, T., Mention, G., Meregaglia, A., Miletic, T., Milincic, R., Minotti, A., Navas-Nicolás, D., Novella, P., Oberauer, L., Obolensky, M., Onillon, A., Oralbaev, A., Palomares, C., Pepe, I. M., Pronost, G., Reichenbacher, J., Reinhold, B., Schönert, S., Schoppmann, S., Sharankova, R., Sibille, V., Sinev, V., Skorokhvatov, M., Soldin, P., Stahl, A., Stancu, I., Stokes, L. F. F., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Viaud, B., Vivier, M., Wagner, S., Wiebusch, C., Yang, G., and Yermia, F.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: A $\theta_{13}$ oscillation analysis based on the observed antineutrino rates at the Double Chooz far and near detectors for different reactor power conditions is presented. This approach provides a so far unique simultaneous determination of $\theta_{13}$ and the total background rates without relying on any assumptions on the specific background contributions. The analysis comprises 865 days of data collected in both detectors with at least one reactor in operation. The oscillation results are enhanced by the use of 24.06 days (12.74 days) of reactor-off data in the far (near) detector. The analysis considers the \nue interactions up to a visible energy of 8.5 MeV, using the events at higher energies to build a cosmogenic background model considering fast-neutrons interactions and $^{9}$Li decays. The background-model-independent determination of the mixing angle yields sin$^2(2\theta_{13})=0.094\pm0.017$, being the best-fit total background rates fully consistent with the cosmogenic background model. A second oscillation analysis is also performed constraining the total background rates to the cosmogenic background estimates. While the central value is not significantly modified due to the consistency between the reactor-off data and the background estimates, the addition of the background model reduces the uncertainty on $\theta_{13}$ to 0.015. Along with the oscillation results, the normalization of the anti-neutrino rate is measured with a precision of 0.86\%, reducing the 1.43\% uncertainty associated to the expectation.
Published: 2020
Full Text: View/download PDF

25. Note on arXiv:2005.05301, 'Preparation of the Neutrino-4 experiment on search for sterile neutrino and the obtained results of measurements'

Author: Almazán, H., Andriamirado, M., Balantekin, A. B., Band, H. R., Bass, C. D., Bergeron, D. E., Berish, D., Bonhomme, A., Bowden, N. S., Brodsky, J. P., Bryan, C. D., Buck, C., Classen, T., Conant, A. J., Deichert, G., Sanchez, P. del Amo, Diwan, M. V., Dolinski, M. J., Atmani, I. El, Erickson, A., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gilbert, C. E., Hackett, B. T., Hans, S., Hansell, A. B., Heeger, K. M., Jaffe, D. E., Ji, X., Jones, D. C., Kyzylova, O., Labit, L., Lamblin, J., Lane, C. E., Langford, T. J., LaRosa, J., Letourneau, A., Lhuillier, D., Licciardi, M., Littlejohn, B. R., Lu, X., Maricic, J., Materna, T., Mendenhall, M. P., Meyer, A. M., Milincic, R., Mitchell, I., Mueller, P. E., Mumm, H. P., Napolitano, J., Nave, C., Neilson, R., Nikkel, J. A., Norcini, D., Nour, S., Palomino-Gallo, J. L., Pessard, H., Pushin, D. A., Qian, X., Réal, J. -S., Roca, C., Rogly, R., Romero-Romero, E., Rosero, R., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., Surukuchi, P. T., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Vialat, M., Weatherly, P. B., White, C., Wilhelmi, J., Woolverton, A., Yeh, M., Zhang, A., Zhang, C., and Zhang, X.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: We comment on the claimed observation [arXiv:arXiv:2005.05301] of sterile neutrino oscillations by the Neutrino-4 collaboration. Such a claim, which requires the existence of a new fundamental particle, demands a level of rigor commensurate with its impact. The burden lies with the Neutrino-4 collaboration to provide the information necessary to prove the validity of their claim to the community. In this note, we describe aspects of both the data and analysis method that might lead to an oscillation signature arising from a null experiment and describe additional information needed from the Neutrino-4 collaboration to support the oscillation claim. Additionally, as opposed to the assertion made by the Neutrino-4 collaboration, we also show that the method of 'coherent summation' using the $L/E$ parameter produces similar results to the methods used by the PROSPECT and the STEREO collaborations., Comment: 5 pages, 3 figures
Published: 2020

26. Accurate Measurement of the Electron Antineutrino Yield of U-235 Fissions from the STEREO Experiment with 119 Days of Reactor-On Data

Author: STEREO Collaboration, Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, Haser, J., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Minotti, A., Onillon, A., Pessard, H., Réal, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., and Vialat, M.
Subjects: High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract: We report a measurement of the antineutrino rate from the fission of U-235 with the STEREO detector using 119 days of reactor turned on. In our analysis, we perform several detailed corrections and achieve the most precise single measurement at reactors with highly enriched U-235 fuel. We measure an IBD cross section per fission of $\sigma_f$ = (6.34 $\pm$ 0.06 [stat] $\pm$ 0.15 [sys] $\pm$ 0.15 [model]) $\times$ 10${}^{-43}$ cm${}^{2}$/fission and observe a rate deficit of (5.2 $\pm$ 0.8 [stat] $\pm$ 2.3 [sys] $\pm$ 2.3 [model])% compared to the model, consistent with the deficit of the world average. Testing U-235 as the sole source of the deficit, we find a tension between the results of lowly and highly enriched U-235 fuel of 2.1 standard deviations., Comment: 7 pages, 1 figure
Published: 2020
Full Text: View/download PDF

27. Demonstration of neutrinoless double beta decay searches in gaseous xenon with NEXT

Author: Novella, P., Sorel, M., Usón, A., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Auria-Luna, F., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., del Barrio-Torregrosa, M., Bayo, A., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Bounasser, S., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Cid, L., Conde, C. A. N., Contreras, T., Cossío, F. P., Dey, E., Díaz, G., Dickel, T., Elorza, M., Escada, J., Esteve, R., Fahs, A., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freitas, E. D. C., Freixa, Z., Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J. J., González, R., Grocott, J., Guenette, R., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Hernando Morata, J. A., Herrero-Gómez, P., Herrero, V., Hervés Carrete, C., Ho, J., Ho, P., Ifergan, Y., Jones, B. J. P., Labarga, L., Larizgoitia, L., Larumbe, A., Lebrun, P., Lopez, F., Lopez Gutierrez, D., López-March, N., Madigan, R., Mano, R. D. P., Marques, A. P., Martín-Albo, J., Martínez-Lema, G., Martínez-Vara, M., Meziani, Z. E., Miller, R. L., Mistry, K., Molina-Canteras, J., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Muñoz Vidal, J., Navarro, K., Nuñez, A., Nygren, D. R., Oblak, E., Odriozola-Gimeno, M., Palacio, J., Palmeiro, B., Para, A., Parmaksiz, I., Pelegrin, J., Pérez Maneiro, M., Querol, M., Redwine, A. B., Renner, J., Rivilla, I., Rodríguez, J., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., dos Santos, J. M. F., Simón, A., Soleti, S. R., Stanford, C., Teixeira, J. M. R., Toledo, J. F., Torrent, J., Veloso, J. F. C. A., Vuong, T. T., Waiton, J., and White, J. T.
Published: 2023
Full Text: View/download PDF

28. Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution

Author: Simón, A, Ifergan, Y, Redwine, AB, Weiss-Babai, R, Arazi, L, Adams, C, Almazán, H, Álvarez, V, Aparicio, B, Aranburu, AI, Arnquist, IJ, Azevedo, CDR, Bailey, K, Ballester, F, Benlloch-Rodríguez, JM, Borges, FIGM, Byrnes, N, Cárcel, S, Carrión, JV, Cebrián, S, Church, E, Conde, CAN, Contreras, T, Cossío, FP, Denisenko, AA, Díaz, G, Díaz, J, Escada, J, Esteve, R, Felkai, R, Fernandes, LMP, Ferrario, P, Ferreira, AL, Foss, F, Freitas, EDC, Freixa, Z, Generowicz, J, Goldschmidt, A, Gómez-Cadenas, JJ, González, R, González-Díaz, D, Gosh, S, Guenette, R, Gutiérrez, RM, Haefner, J, Hafidi, K, Hauptman, J, Henriques, CAO, Hernando Morata, JA, Herrero, P, Herrero, V, Ho, J, Jones, BJP, Kekic, M, Labarga, L, Laing, A, Lebrun, P, López-March, N, Losada, M, Mano, RDP, Martín-Albo, J, Martínez, A, Martínez-Vara, M, Martínez-Lema, G, McDonald, AD, Meziani, Z-E, Monrabal, F, Monteiro, CMB, Mora, FJ, Muñoz Vidal, J, Newhouse, C, Novella, P, Nygren, DR, Oblak, E, Odriozola-Gimeno, M, Palmeiro, B, Para, A, Pérez, J, Querol, M, Renner, J, Ripoll, L, Rivilla, I, Rodríguez García, Y, Rodríguez, J, Rogero, C, Rogers, L, Romeo, B, Romo-Luque, C, Santos, FP, dos Santos, JMF, Sorel, M, Stanford, C, Teixeira, JMR, Thapa, P, Toledo, JF, Torrent, J, Usón, A, Veloso, JFCA, Vuong, TT, and Webb, R
Subjects: Affordable and Clean Energy, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: Next-generation neutrinoless double beta decay experiments aim for half-life sensitivities of ∼ 1027 yr, requiring suppressing backgrounds to < 1 count/tonne/yr. For this, any extra background rejection handle, beyond excellent energy resolution and the use of extremely radiopure materials, is of utmost importance. The NEXT experiment exploits differences in the spatial ionization patterns of double beta decay and single-electron events to discriminate signal from background. While the former display two Bragg peak dense ionization regions at the opposite ends of the track, the latter typically have only one such feature. Thus, comparing the energies at the track extremes provides an additional rejection tool. The unique combination of the topology-based background discrimination and excellent energy resolution (1% FWHM at the Q-value of the decay) is the distinguishing feature of NEXT. Previous studies demonstrated a topological background rejection factor of ∼ 5 when reconstructing electron-positron pairs in the 208Tl 1.6 MeV double escape peak (with Compton events as background), recorded in the NEXT-White demonstrator at the Laboratorio Subterráneo de Canfranc, with 72% signal efficiency. This was recently improved through the use of a deep convolutional neural network to yield a background rejection factor of ∼ 10 with 65% signal efficiency. Here, we present a new reconstruction method, based on the Richardson-Lucy deconvolution algorithm, which allows reversing the blurring induced by electron diffusion and electroluminescence light production in the NEXT TPC. The new method yields highly refined 3D images of reconstructed events, and, as a result, significantly improves the topological background discrimination. When applied to real-data 1.6 MeV e−e+ pairs, it leads to a background rejection factor of 27 at 57% signal efficiency. [Figure not available: see fulltext.].
Published: 2021

29. Improved Sterile Neutrino Constraints from the STEREO Experiment with 179 Days of Reactor-On Data

Author: STEREO Collaboration, Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, Haser, J., Kandzia, F., Kox, S., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Minotti, A., Pessard, H., Réal, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., and Vialat, M.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: The STEREO experiment is a very short baseline reactor antineutrino experiment. It is designed to test the hypothesis of light sterile neutrinos being the cause of a deficit of the observed antineutrino interaction rate at short baselines with respect to the predicted rate, known as the reactor antineutrino anomaly. The STEREO experiment measures the antineutrino energy spectrum in six identical detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this article, results from 179 days of reactor turned on and 235 days of reactor turned off are reported at a high degree of detail. The current results include improvements in the modelling of detector optical properties and the gamma-cascade after neutron captures by gadolinium, the treatment of backgrounds, and the statistical method of the oscillation analysis. Using a direct comparison between antineutrino spectra of all cells, largely independent of any flux prediction, we find the data compatible with the null oscillation hypothesis. The best-fit point of the reactor antineutrino anomaly is rejected at more than 99.9% C.L., Comment: 31 pages, 35 figures, for supplemental data see http://doi.org/10.17182/hepdata.92323
Published: 2019
Full Text: View/download PDF

30. Improved STEREO simulation with a new gamma ray spectrum of excited gadolinium isotopes using FIFRELIN

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chebboubi, A., Sanchez, P. del Amo, Atmani, I. El, Haser, J., Kandzia, F., Kox, S., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Lindner, M., Litaize, O., Materna, T., Minotti, A., Pessard, H., Réal, J. -S., Roca, C., Salagnac, T., Savu, V., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., Thulliez, L., and Vialat, M.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: The STEREO experiment measures the electron antineutrino spectrum emitted in a research reactor using the inverse beta decay reaction on H nuclei in a gadolinium loaded liquid scintillator. The detection is based on a signal coincidence of a prompt positron and a delayed neutron capture event. The simulated response of the neutron capture on gadolinium is crucial for the comparison with data, in particular in the case of the detection efficiency. Among all stable isotopes, $^{155}$Gd and $^{157}$Gd have the highest cross sections for thermal neutron capture. The excited nuclei after the neutron capture emit gamma rays with a total energy of about 8 MeV. The complex level schemes of $^{156}$Gd and $^{158}$Gd are a challenge for the modeling and prediction of the deexcitation spectrum, especially for compact detectors where gamma rays can escape the active volume. With a new description of the Gd(n,${\gamma}$) cascades obtained using the FIFRELIN code, the agreement between simulation and measurements with a neutron calibration source was significantly improved in the STEREO experiment. A database of ten millions of deexcitation cascades for each isotope has been generated and is now available for the user., Comment: 5 pages, 3 figures
Published: 2019
Full Text: View/download PDF

31. Improved FIFRELIN de-excitation model for neutrino applications

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., Chebboubi, A., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Litaize, O., Materna, T., Pessard, H., Réal, J.-S., Ricol, J.-S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., Thulliez, L., and Vialat, M.
Published: 2023
Full Text: View/download PDF

32. Sterile Neutrino Constraints from the STEREO Experiment with 66 days of Reactor-on Data

Author: Almazán, H., Sanchez, P. del Amo, Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Favier, J., Haser, J., Hélaine, V., Kandzia, F., Kox, S., Lamblin, J., Letourneau, A., Lhuillier, D., Lindner, M., Manzanillas, L., Materna, T., Minotti, A., Montanet, F., Pessard, H., Real, J. -S., Roca, C., Salagnac, T., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., and Zsoldos, S.
Subjects: High Energy Physics - Experiment
Abstract: The reactor antineutrino anomaly might be explained by the oscillation of reactor antineutrinos toward a sterile neutrino of eV mass. In order to explore this hypothesis, the STEREO experiment measures the antineutrino energy spectrum in six different detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this Letter, results from 66 days of reactor turned on and 138 days of reactor turned off are reported. A novel method to extract the antineutrino rates has been developed based on the distribution of the pulse shape discrimination parameter. The test of a new oscillation toward a sterile neutrino is performed by comparing ratios of cells, independent of absolute normalization and of the prediction of the reactor spectrum. The results are found to be compatible with the null oscillation hypothesis and the best fit of the reactor antineutrino anomaly is excluded at 97.5\% C.L.
Published: 2018
Full Text: View/download PDF

33. The STEREO Experiment

Author: Allemandou, N., Almazán, H., Sanchez, P. del Amo, Bernard, L., Bernard, C., Blanchet, A., Bonhomme, A., Bosson, G., Bourrion, O., Bouvier, J., Buck, C., Caillot, V., Chala, M., Champion, P., Charon, P., Collin, A., Contrepois, P., Coulloux, G., Desbrières, B., Deleglise, G., Kanawati, W. El, Favier, J., Fuard, S., Monteiro, I. Gomes, Gramlich, B., Haser, J., Helaine, V., Heusch, M., Jentschel, M., Kandzia, F., Konrad, G., Köster, U., Kox, S., Lahonde-Hamdoun, C., Lamblin, J., Letourneau, A., Lhuillier, D., Li, C., Lindner, M., Manzanillas, L., Materna, T., Méplan, O., Minotti, A., Monon, C., Montanet, F., Nunio, F., Peltier, F., Penichot, Y., Pequignot, M., Pessard, H., Piret, Y., Prono, G., Quéméner, G., Real, J. -S., Roca, C., Salagnac, T., Sergeyeva, V., Schoppmann, S., Scola, L., Scordilis, J. -P., Soldner, T., Stutz, A., Tourres, D., Vescovi, C., and Zsoldos, S.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: The STEREO experiment is a very short baseline reactor antineutrino experiment aiming at testing the hypothesis of light sterile neutrinos as an explanation of the deficit of the observed neutrino interaction rate with respect to the predicted rate, known as the Reactor Antineutrino Anomaly. The detector center is located 10 m away from the compact, highly $^{235}$U enriched core of the research nuclear reactor of the Institut Laue Langevin in Grenoble, France. This paper describes the STEREO site, the detector components and associated shielding designed to suppress the external sources of background which were characterized on site. It reports the performances in terms of detector response and energy reconstruction., Comment: 32 pages, 17 figures
Published: 2018
Full Text: View/download PDF

34. Yields and production rates of cosmogenic $^9$Li and $^8$He measured with the Double Chooz near and far detectors

Author: de Kerret, H., Abrahão, T., Almazan, H., Anjos, J. C. dos, Appel, S., Barriere, J. C., Bekman, I., Bezerra, T. J. C., Bezrukov, L., Blucher, E., Brugière, T., Buck, C., Busenitz, J., Cabrera, A., Cerrada, M., Chauveau, E., Chimenti, P., Corpace, O., Dawson, J. V., Djurcic, Z., Etenko, A., Franco, D., Furuta, H., Gil-Botella, I., Givaudan, A., Gomez, H., Gonzalez, L. F. G., Goodman, M. C., Hara, T., Haser, J., Hellwig, D., Hourlier, A., Ishitsuka, M., Jochum, J., Jollet, C., Kale, K., Kaneda, M., Karakac, M., Kawasaki, T., Kemp, E., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C. E., Lasserre, T., Lastoria, C., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Maeda, J., Mariani, C., Maricic, J., Martino, J., Matsubara, T., Mention, G., Meregaglia, A., Miletic, T., Milincic, R., Navas-Nicolás, D., Novella, P., Nunokawa, H., Oberauer, L., Obolensky, M., Onillon, A., Oralbaev, A., Palomares, C., Pepe, I. M., Pronost, G., Reichenbacher, J., Reinhold, B., Settimo, M., Schönert, S., Schoppmann, S., Scola, L., Sharankova, R., Sibille, V., Sinev, V., Skorokhvatov, M., Soldin, P., Stahl, A., Stancu, I., Stokes, L. F. F., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Tonazzo, A., Veyssiere, C., Viaud, B., Vivier, M., Wagner, S., Wiebusch, C., Wurm, M., Yang, G., and Yermia, F.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: The yields and production rates of the radioisotopes $^9$Li and $^8$He created by cosmic muon spallation on $^{12}$C, have been measured by the two detectors of the Double Chooz experiment. The identical detectors are located at separate sites and depths, which means they are subject to different muon spectra. The near (far) detector has an overburden of $\sim$120 m.w.e. ($\sim$300 m.w.e.) corresponding to a mean muon energy of $32.1\pm2.0\,\mathrm{GeV}$ ($63.7\pm5.5\,\mathrm{GeV}$). Comparing the data to a detailed simulation of the $^9$Li and $^8$He decays, the contribution of the $^8$He radioisotope at both detectors is found to be compatible with zero. The observed $^9$Li yields in the near and far detectors are $5.51\pm0.51$ and $7.90\pm0.51$, respectively, in units of $10^{-8}\mu ^{-1} \mathrm{g^{-1} cm^{2} }$. The shallow overburdens of the near and far detectors give a unique insight when combined with measurements by KamLAND and Borexino to give the first multi--experiment, data driven relationship between the $^9$Li yield and the mean muon energy according to the power law $Y = Y_0( / 1\,\mathrm{GeV})^{\overline{\alpha}}$, giving $\overline{\alpha}=0.72\pm0.06$ and $Y_0=(0.43\pm0.11)\times 10^{-8}\mu ^{-1} \mathrm{g^{-1} cm^{2}}$. This relationship gives future liquid scintillator based experiments the ability to predict their cosmogenic $^9$Li background rates., Comment: 15 pages, 5 figures
Published: 2018
Full Text: View/download PDF

35. The dynamics of ions on phased radio-frequency carpets in high pressure gases and application for barium tagging in xenon gas time projection chambers

Author: Jones, B.J.P., Raymond, A., Woodruff, K., Byrnes, N., Denisenko, A.A., Foss, F.W., Navarro, K., Nygren, D.R., Vuong, T.T., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A.I., Arazi, L., Arnquist, I.J., Ayet, S., Azevedo, C.D.R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J.M., Borges, F.I.G.M., Bounasser, S., Cárcel, S., Carrión, J.V., Cebrián, S., Church, E., Conde, C.A.N., Contreras, T., Cossío, F.P., Díaz, G., Díaz, J., Dickel, T., Escada, J., Esteve, R., Fahs, A., Felkai, R., Fernandes, L.M.P., Ferrario, P., Ferreira, A.L., Freitas, E.D.C., Freixa, Z., Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J.J., González, R., González-Díaz, D., Guenette, R., Gutiérrez, R.M., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C.A.O., Morata, J.A. Hernando, Herrero-Gómez, P., Herrero, V., Ho, J., Ifergan, Y., Kekic, M., Labarga, L., Laing, A., Lebrun, P., Gutierrez, D. Lopez, López-March, N., Losada, M., Mano, R.D.P., Martín-Albo, J., Martínez, A., Martínez-Lema, G., Martínez-Vara, M., McDonald, A.D., Meziani, Z.E., Mistry, K., Monrabal, F., Monteiro, C.M.B., Mora, F.J., Vidal, J. Muñoz, Novella, P., Oblak, E., Odriozola-Gimeno, M., Palmeiro, B., Para, A., Pérez, J., Querol, M., Redwine, A.B., Renner, J., Ripoll, L., Rivilla, I., García, Y. Rodríguez, Rodríguez, J., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F.P., dos Santos, J.M.F., Simón, A., Sorel, M., Stanford, C., Teixeira, J.M.R., Thapa, P., Toledo, J.F., Torrent, J., Usón, A., Veloso, J.F.C.A., Webb, R., Weiss-Babai, R., White, J.T., and Yahlali, N.
Published: 2022
Full Text: View/download PDF

36. Novel event classification based on spectral analysis of scintillation waveforms in Double Chooz

Author: Abrahão, T., Almazan, H., Anjos, J. C. dos, Appel, S., Bekman, I., Bezerra, T. J. C., Bezrukov, L., Blucher, E., Brugière, T., Buck, C., Busenitz, J., Cabrera, A., Camilleri, L., Cerrada, M., Chauveau, E., Chimenti, P., Corpace, O., Crespo-Anadón, J. I., Dawson, J. V., Djurcic, Z., Etenko, A., Fallot, M., Franco, D., Furuta, H., Gil-Botella, I., Givaudan, A., Gómez, H., Gonzalez, L. F. G., Goodman, M., Hara, T., Haser, J., Hellwig, D., Hourlier, A., Ishitsuka, M., Jochum, J., Jollet, C., Kale, K., Kampmann, P., Kaneda, M., Kawasaki, T., Kemp, E., de Kerret, H., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C., Lasserre, T., Lastoria, C., Lhuillier, D., Lima, H., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Maeda, J., Mariani, C., Maricic, J., Matsubara, T., Mention, G., Meregaglia, A., Miletic, T., Milincic, R., Minotti, A., Navas-Nicolás, D., Novella, P., Oberauer, L., Obolensky, M., Onillon, A., Oralbaev, A., Palomares, C., Pepe, I., Pronost, G., Reinhold, B., Santorelli, R., Schönert, S., Schoppmann, S., Settimo, M., Sharankova, R., Sibille, V., Sinev, V., Skorokhvatov, M., Soldin, P., Stahl, A., Stancu, I., Stokes, L. F. F., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Tonazzo, A., Veyssiere, C., Viaud, B., Vivier, M., Wagner, S., Wiebusch, C., Yang, G., and Yermia, F.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: Liquid scintillators are a common choice for neutrino physics experiments, but their capabilities to perform background rejection by scintillation pulse shape discrimination is generally limited in large detectors. This paper describes a novel approach for a pulse shape based event classification developed in the context of the Double Chooz reactor antineutrino experiment. Unlike previous implementations, this method uses the Fourier power spectra of the scintillation pulse shapes to obtain event-wise information. A classification variable built from spectral information was able to achieve an unprecedented performance, despite the lack of optimization at the detector design level. Several examples of event classification are provided, ranging from differentiation between the detector volumes and an efficient rejection of instrumental light noise, to some sensitivity to the particle type, such as stopping muons, ortho-positronium formation, alpha particles as well as electrons and positrons. In combination with other techniques the method is expected to allow for a versatile and more efficient background rejection in the future, especially if detector optimization is taken into account at the design level., Comment: 27 pages, 14 figures
Published: 2017
Full Text: View/download PDF

37. Cosmic-muon characterization and annual modulation measurement with Double Chooz detectors

Author: Abrahão, T., Almazan, H., Anjos, J. C. dos, Appel, S., Baussan, E., Bekman, I., Bezerra, T. J. C., Bezrukov, L., Blucher, E., Brugière, T., Buck, C., Busenitz, J., Cabrera, A., Camilleri, L., Carr, R., Cerrada, M., Chauveau, E., Chimenti, P., Corpace, O., Crespo-Anadón, J. I., Dawson, J. V., Dhooghe, J., Djurcic, Z., Dracos, M., Etenko, A., Fallot, M., Franco, D., Franke, M., Furuta, H., Gil-Botella, I., Giot, L., Givaudan, A., Gögger-Neff, M., Gómez, H., Gonzalez, L. F. G., Goodman, M., Hara, T., Haser, J., Hellwig, D., Hourlier, A., Ishitsuka, M., Jochum, J., Jollet, C., Kale, K., Kampmann, P., Kaneda, M., Kaplan, D. M., Kawasaki, T., Kemp, E., de Kerret, H., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C., Laserre, T., Lastoria, C., Lhuillier, D., Lima, H., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Maeda, J., Mariani, C., Maricic, J., Matsubara, T., Mention, G., Meregaglia, A., Miletic, T., Minotti, A., Nagasaka, Y., Navas-Nicolás, D., Novella, P., Oberauer, L., Obolensky, M., Onillon, A., Oralbaev, A., Palomares, C., Pepe, I., Pronost, G., Reinhold, B., Rybolt, B., Sakamoto, Y., Santorelli, R., Schönert, S., Schoppmann, S., Sharankova, R., Sibille, V., Sinev, V., Skorokhvatov, M., Soiron, M., Soldin, P., Stahl, A., Stancu, I., Stokes, L. F. F., Strait, M., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Svoboda, B., Tonazzo, A., Veyssiere, C., Vivier, M., Wagner, S., Wiebusch, C., Wurm, M., Yang, G., Yermia, F., and Zimmer, V.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: A study on cosmic muons has been performed for the two identical near and far neutrino detectors of the Double Chooz experiment, placed at $\sim$120 and $\sim$300 m.w.e. underground respectively, including the corresponding simulations using the MUSIC simulation package. This characterization has allowed to measure the muon flux reaching both detectors to be (3.64 $\pm$ 0.04) $\times$ 10$^{-4}$ cm$^{-2}$s$^{-1}$ for the near detector and (7.00 $\pm$ 0.05) $\times$ 10$^{-5}$ cm$^{-2}$s$^{-1}$ for the far one. The seasonal modulation of the signal has also been studied observing a positive correlation with the atmospheric temperature, leading to an effective temperature coefficient of $\alpha_{T}$ = 0.212 $\pm$ 0.024 and 0.355 $\pm$ 0.019 for the near and far detectors respectively. These measurements, in good agreement with expectations based on theoretical models, represent one of the first measurements of this coefficient in shallow depth installations., Comment: 20 pages, 11 figures
Published: 2016
Full Text: View/download PDF

38. Characterization of the Spontaneous Light Emission of the PMTs used in the Double Chooz Experiment

Author: Double Chooz collaboration, Abe, Y., Abrahão, T., Almazan, H., Alt, C., Appel, S., Baussan, E., Bekman, I., Bergevin, M., Bezerra, T. J. C., Bezrukov, L., Blucher, E., Brugière, T., Buck, C., Busenitz, J., Cabrera, A., Calvo, E., Camilleri, L., Carr, R., Cerrada, M., Chauveau, E., Chimenti, P., Collin, A. P., Conover, E., Conrad, J. M., Crespo-Anadón, J. I., Crum, K., Cucoanes, A. S., Damon, E., Dawson, J. V., de Kerret, H., Dhooghe, J., Dietrich, D., Djurcic, Z., Anjos, J. C. dos, Dracos, M., Etenko, A., Fallot, M., Felde, J., Fernandes, S. M., Fischer, V., Franco, D., Franke, M., Furuta, H., Gil-Botella, I., Giot, L., Göger-Neff, M., Gomez, H., Gonzalez, L. F. G., Goodenough, L., Goodman, M. C., Haag, N., Hara, T., Haser, J., Hellwig, D., Hofmann, M., Horton-Smith, G. A., Hourlier, A., Ishitsuka, M., Jiménez, S., Jochum, J., Jollet, C., Kaether, F., Kalousis, L. N., Kamyshkov, Y., Kaneda, M., Kaplan, D. M., Kawasaki, T., Kemp, E., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C. E., Lasserre, T., Letourneau, A., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Lucht, S., Maeda, J., Mariani, C., Maricic, J., Martino, J., Matsubara, T., Mention, G., Meregaglia, A., Miletic, T., Milincic, R., Minotti, A., Nagasaka, Y., Navas-Nicolás, D., Novella, P., Nunokawa, H., Oberauer, L., Obolensky, M., Onillon, A., Osborn, A., Palomares, C., Pepe, I. M., Perasso, S., Porta, A., Pronost, G., Reichenbacher, J., Reinhold, B., Röhling, M., Roncin, R., Rybolt, B., Sakamoto, Y., Santorelli, R., Schilithz, A. C., Schönert, S., Schoppmann, S., Shaevitz, M. H., Sharankova, R., Shrestha, D., Sibille, V., Sinev, V., Skorokhvatov, M., Smith, E., Soiron, M., Spitz, J., Stahl, A., Stancu, I., Stokes, L. F. F., Strait, M., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Svoboda, R., Terao, K., Tonazzo, A., Thi, H. H. Trinh, Valdiviesso, G., Vassilopoulos, N., Veyssiere, C., Vivier, M., von Feilitzsch, F., Wagner, S., Walsh, N., Watanabe, H., Wiebusch, C., Wurm, M., Yang, G., Yermia, F., and Zimmer, V.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: During the commissioning of the first of the two detectors of the Double Chooz experiment, an unexpected and dominant background caused by the emission of light inside the optical volume has been observed. A specific study of the ensemble of phenomena called "Light Noise" has been carried out in-situ, and in an external laboratory, in order to characterize the signals and to identify the possible processes underlying the effect. Some mechanisms of instrumental noise originating from the PMTs were identified and it has been found that the leading one arises from the light emission localized on the photomultiplier base and produced by the combined effect of heat and high voltage across the transparent epoxy resin covering the electric components. The correlation of the rate and the amplitude of the signal with the temperature has been observed. For the first detector in operation the induced background has been mitigated using online and offline analysis selections based on timing and light pattern of the signals, while a modification of the photomultiplier assembly has been implemented for the second detector in order to blacken the PMT bases., Comment: 24 pages, 24 figures. Minor revision to be published in the Journal of Instrumentation (JINST), Corresponding author: R. Santorelli
Published: 2016
Full Text: View/download PDF

39. Muon capture on light isotopes in Double Chooz

Author: Double Chooz collaboration, Abe, Y., Abrahão, T., Almazan, H., Alt, C., Appel, S., Barriere, J. C., Baussan, E., Bekman, I., Bergevin, M., Bezerra, T. J. C., Bezrukov, L., Blucher, E., Brugière, T., Buck, C., Busenitz, J., Cabrera, A., Camilleri, L., Carr, R., Cerrada, M., Chauveau, E., Chimenti, P., Collin, A. P., Conover, E., Conrad, J. M., Crespo-Anadón, J. I., Crum, K., Cucoanes, A. S., Damon, E., Dawson, J. V., de Kerret, H., Dhooghe, J., Dietrich, D., Djurcic, Z., Anjos, J. C. dos, Dracos, M., Etenko, A., Fallot, M., Felde, J., Fernandes, S. M., Fischer, V., Franco, D., Franke, M., Furuta, H., Gil-Botella, I., Giot, L., Göger-Neff, M., Gomez, H., Gonzalez, L. F. G., Goodenough, L., Goodman, M. C., Haag, N., Hara, T., Haser, J., Hellwig, D., Hofmann, M., Horton-Smith, G. A., Hourlier, A., Ishitsuka, M., Jochum, J., Jollet, C., Kaether, F., Kalousis, L. N., Kamyshkov, Y., Kaneda, M., Kaplan, D. M., Kawasaki, T., Kemp, E., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C. E., Lasserre, T., Letourneau, A., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Lucht, S., Maeda, J., Mariani, C., Maricic, J., Martino, J., Matsubara, T., Mention, G., Meregaglia, A., Miletic, T., Milincic, R., Minotti, A., Nagasaka, Y., Navas-Nicolás, D., Novella, P., Oberauer, L., Obolensky, M., Onillon, A., Osborn, A., Palomares, C., Pepe, I. M., Perasso, S., Porta, A., Pronost, G., Reichenbacher, J., Reinhold, B., Röhling, M., Roncin, R., Rybolt, B., Sakamoto, Y., Santorelli, R., Schilithz, A. C., Schönert, S., Schoppmann, S., Shaevitz, M. H., Sharankova, R., Shrestha, D., Sibille, V., Sinev, V., Skorokhvatov, M., Smith, E., Soiron, M., Spitz, J., Stahl, A., Stancu, I., Stokes, L. F. F., Strait, M., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Svoboda, R., Terao, K., Tonazzo, A., Thi, H. H. Trinh, Valdiviesso, G., Vassilopoulos, N., Veyssiere, C., Vivier, M., von Feilitzsch, F., Wagner, S., Walsh, N., Watanabe, H., Wiebusch, C., Wurm, M., Yang, G., Yermia, F., and Zimmer, V.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: Using the Double Chooz detector, designed to measure the neutrino mixing angle $\theta_{13}$, the products of $\mu^-$ capture on $^{12}$C, $^{13}$C, $^{14}$N and $^{16}$O have been measured. Over a period of 489.5 days, $2.3\times10^6$ stopping cosmic $\mu^-$ have been collected, of which $1.8\times10^5$ captured on carbon, nitrogen, or oxygen nuclei in the inner detector scintillator or acrylic vessels. The resulting isotopes were tagged using prompt neutron emission (when applicable), the subsequent beta decays, and, in some cases, $\beta$-delayed neutrons. The most precise measurement of the rate of $^{12}\mathrm C(\mu^-,\nu)^{12}\mathrm B$ to date is reported: $6.57^{+0.11}_{-0.21}\times10^{3}\,\mathrm s^{-1}$, or $(17.35^{+0.35}_{-0.59})\%$ of nuclear captures. By tagging excited states emitting gammas, the ground state transition rate to $^{12}$B has been determined to be $5.68^{+0.14}_{-0.23}\times10^3\,\mathrm s^{-1}$. The heretofore unobserved reactions $^{12}\mathrm C(\mu^-,\nu\alpha)^{8}\mathrm{Li}$, $^{13}\mathrm C(\mu^-,\nu\mathrm n\alpha)^{8}\mathrm{Li}$, and $^{13}\mathrm C(\mu^-,\nu\mathrm n)^{12}\mathrm B$ are measured. Further, a population of $\beta$n decays following stopping muons is identified with $5.5\sigma$ significance. Statistics limit our ability to identify these decays definitively. Assuming negligible production of $^{8}$He, the reaction $^{13}\mathrm C(\mu^-,\nu\alpha)^{9}\mathrm{Li}$ is found to be present at the $2.7\sigma$ level. Limits are set on a variety of other processes., Comment: 21 pages, 14 figures. Minor revisions. Corresponding author: M. Strait
Published: 2015
Full Text: View/download PDF

40. Measurement of $\theta_{13}$ in Double Chooz using neutron captures on hydrogen with novel background rejection techniques

Author: Abe, Y., Appel, S., Abrahão, T., Almazan, H., Alt, C., Anjos, J. C. dos, Barriere, J. C., Baussan, E., Bekman, I., Bergevin, M., Bezerra, T. J. C., Bezrukov, L., Blucher, E., Brugière, T., Buck, C., Busenitz, J., Cabrera, A., Camilleri, L., Carr, R., Cerrada, M., Chauveau, E., Chimenti, P., Collin, A. P., Conrad, J. M., Crespo-Anadón, J. I., Crum, K., Cucoanes, A. S., Damon, E., Dawson, J. V., Dhooghe, J., Dietrich, D., Djurcic, Z., Dracos, M., Etenko, A., Fallot, M., von Feilitzsch, F., Felde, J., Fernandes, S. M., Fischer, V., Franco, D., Franke, M., Furuta, H., Gil-Botella, I., Giot, L., Göger-Neff, M., Gomez, H., Gonzalez, L. F. G., Goodenough, L., Goodman, M. C., Haag, N., Hara, T., Haser, J., Hellwig, D., Hofmann, M., Horton-Smith, G. A., Hourlier, A., Ishitsuka, M., Jochum, J., Jollet, C., Kaether, F., Kalousis, L. N., Kamyshkov, Y., Kaneda, M., Kaplan, D. M., Kawasaki, T., Kemp, E., de Kerret, H., Kryn, D., Kuze, M., Lachenmaier, T., Lane, C. E., Lasserre, T., Letourneau, A., Lhuillier, D., Lima Jr, H. P., Lindner, M., López-Castaño, J. M., LoSecco, J. M., Lubsandorzhiev, B., Lucht, S., Maeda, J., Mariani, C., Maricic, J., Martino, J., Matsubara, T., Mention, G., Meregaglia, A., Miletic, T., Milincic, R., Minotti, A., Nagasaka, Y., Navas-Nicolás, D., Novella, P., Oberauer, L., Obolensky, M., Onillon, A., Osborn, A., Palomares, C., Pepe, I. M., Perasso, S., Porta, A., Pronost, G., Reichenbacher, J., Reinhold, B., Röhling, M., Roncin, R., Rybolt, B., Sakamoto, Y., Santorelli, R., Schilithz, A. C., Schönert, S., Schoppmann, S., Shaevitz, M. H., Sharankova, R., Shrestha, D., Sibille, V., Sinev, V., Skorokhvatov, M., Smith, E., Soiron, M., Spitz, J., Stahl, A., Stancu, I., Stokes, L. F. F., Strait, M., Suekane, F., Sukhotin, S., Sumiyoshi, T., Sun, Y., Svoboda, R., Terao, K., Tonazzo, A., Thi, H. H. Trinh, Valdiviesso, G., Vassilopoulos, N., Veyssiere, C., Vivier, M., Wagner, S., Walsh, N., Watanabe, H., Wiebusch, C., Wurm, M., Yang, G., Yermia, F., and Zimmer, V.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: The Double Chooz collaboration presents a measurement of the neutrino mixing angle $\theta_{13}$ using reactor $\overline{\nu}_{e}$ observed via the inverse beta decay reaction in which the neutron is captured on hydrogen. This measurement is based on 462.72 live days data, approximately twice as much data as in the previous such analysis, collected with a detector positioned at an average distance of 1050m from two reactor cores. Several novel techniques have been developed to achieve significant reductions of the backgrounds and systematic uncertainties. Accidental coincidences, the dominant background in this analysis, are suppressed by more than an order of magnitude with respect to our previous publication by a multi-variate analysis. These improvements demonstrate the capability of precise measurement of reactor $\overline{\nu}_{e}$ without gadolinium loading. Spectral distortions from the $\overline{\nu}_{e}$ reactor flux predictions previously reported with the neutron capture on gadolinium events are confirmed in the independent data sample presented here. A value of $\sin^{2}2\theta_{13} = 0.095^{+0.038}_{-0.039}$(stat+syst) is obtained from a fit to the observed event rate as a function of the reactor power, a method insensitive to the energy spectrum shape. A simultaneous fit of the hydrogen capture events and of the gadolinium capture events yields a measurement of $\sin^{2}2\theta_{13} = 0.088\pm0.033$(stat+syst).
Published: 2015
Full Text: View/download PDF

41. NEXT-CRAB-0: a high pressure gaseous xenon time projection chamber with a direct VUV camera based readout

Author: Byrnes, N.K., primary, Parmaksiz, I., additional, Adams, C., additional, Asaadi, J., additional, Baeza-Rubio, J., additional, Bailey, K., additional, Church, E., additional, González-Díaz, D., additional, Higley, A., additional, Jones, B.J.P., additional, Mistry, K., additional, Moya, I.A., additional, Nygren, D.R., additional, Oyedele, P., additional, Rogers, L., additional, Stogsdill, K., additional, Almazán, H., additional, Álvarez, V., additional, Aparicio, B., additional, Aranburu, A.I., additional, Arazi, L., additional, Arnquist, I.J., additional, Ayet, S., additional, Azevedo, C.D.R., additional, Ballester, F., additional, del Barrio-Torregrosa, M., additional, Bayo, A., additional, Benlloch-Rodríguez, J.M., additional, Borges, F.I.G.M., additional, Bounasser, S., additional, Cárcel, S., additional, Carrión, J.V., additional, Cebrián, S., additional, Cid, L., additional, Conde, C.A.N., additional, Contreras, T., additional, Cossío, F.P., additional, Dey, E., additional, Díaz, G., additional, Dickel, T., additional, Elorza, M., additional, Escada, J., additional, Esteve, R., additional, Fahs, A., additional, Felkai, R., additional, Fernandes, L.M.P., additional, Ferrario, P., additional, Ferreira, A.L., additional, Foss, F.W., additional, Freitas, E.D.C., additional, Freixa, Z., additional, Generowicz, J., additional, Goldschmidt, A., additional, Gómez-Cadenas, J.J., additional, González, R., additional, Grocott, J., additional, Guenette, R., additional, Haefner, J., additional, Hafidi, K., additional, Hauptman, J., additional, Henriques, C.A.O., additional, Hernando Morata, J.A., additional, Herrero-Gómez, P., additional, Herrero, V., additional, Hervés Carrete, C., additional, Ho, J., additional, Ho, P., additional, Ifergan, Y., additional, Labarga, L., additional, Larizgoitia, L., additional, Lebrun, P., additional, Lopez, F., additional, Lopez Gutierrez, D., additional, López-March, N., additional, Madigan, R., additional, Mano, R.D.P., additional, Marques, A.P., additional, Martín-Albo, J., additional, Martínez-Lema, G., additional, Martínez-Vara, M., additional, Meziani, Z.E., additional, Miller, R.L., additional, Monrabal, F., additional, Monteiro, C.M.B., additional, Mora, F.J., additional, Muñoz Vidal, J., additional, Navarro, K.E., additional, Novella, P., additional, Nuñez, A., additional, Oblak, E., additional, Odriozola-Gimeno, M., additional, Palacio, J., additional, Palmeiro, B., additional, Para, A., additional, Pelegrin, J., additional, Pérez Maneiro, M., additional, Querol, M., additional, Redwine, A.B., additional, Renner, J., additional, Rivilla, I., additional, Rodríguez, J., additional, Rogero, C., additional, Romeo, B., additional, Romo-Luque, C., additional, Santos, F.P., additional, dos Santos, J.M.F., additional, Simón, A., additional, Soleti, S.R., additional, Sorel, M., additional, Stanford, C., additional, Teixeira, J.M.R., additional, Toledo, J.F., additional, Torrent, J., additional, Usón, A., additional, Veloso, J.F.C.A., additional, Vuong, T.T., additional, Waiton, J., additional, and White, J.T., additional
Published: 2023
Full Text: View/download PDF

42. A compact dication source for Ba2+ tagging and heavy metal ion sensor development

Author: Navarro, K.E., primary, Baeza-Rubio, J., additional, Boyd, M., additional, Foss, F.W., additional, Giri, S., additional, Jones, B.J.P., additional, Miller, R.L., additional, Nygren, D.R., additional, Samaniego, F.J., additional, Stogsdill, K., additional, Tiscareno, M.R., additional, Adams, C., additional, Almazán, H., additional, Álvarez, V., additional, Aparicio, B., additional, Aranburu, A.I., additional, Arazi, L., additional, Arnquist, I.J., additional, Ayet, S., additional, Azevedo, C.D.R., additional, Bailey, K., additional, Ballester, F., additional, del Barrio-Torregrosa, M., additional, Bayo, A., additional, Benlloch-Rodríguez, J.M., additional, Borges, F.I.G.M., additional, Bounasser, S., additional, Byrnes, N., additional, Cárcel, S., additional, Carrión, J.V., additional, Cebrián, S., additional, Church, E., additional, Cid, L., additional, Conde, C.A.N., additional, Contreras, T., additional, Cossío, F.P., additional, Dey, E., additional, Díaz, G., additional, Dickel, T., additional, Elorza, M., additional, Escada, J., additional, Esteve, R., additional, Fahs, A., additional, Felkai, R., additional, Fernandes, L.M.P., additional, Ferrario, P., additional, Ferreira, A.L., additional, Freitas, E.D.C., additional, Freixa, Z., additional, Generowicz, J., additional, Goldschmidt, A., additional, Gómez-Cadenas, J.J., additional, González, R., additional, Grocott, J., additional, Guenette, R., additional, Haefner, J., additional, Hafidi, K., additional, Hauptman, J., additional, Henriques, C.A.O., additional, Hernando Morata, J.A., additional, Herrero-Gómez, P., additional, Herrero, V., additional, Hervés Carrete, C., additional, Ho, J., additional, Ho, P., additional, Ifergan, Y., additional, Labarga, L., additional, Larizgoitia, L., additional, Lebrun, P., additional, Lopez, F., additional, Lopez Gutierrez, D., additional, López-March, N., additional, Madigan, R., additional, Mano, R.D.P., additional, Marques, A.P., additional, Martín-Albo, J., additional, Martínez-Lema, G., additional, Martínez-Vara, M., additional, Meziani, Z.E., additional, Mistry, K., additional, Monrabal, F., additional, Monteiro, C.M.B., additional, Mora, F.J., additional, Muñoz Vidal, J., additional, Novella, P., additional, Nuñez, A., additional, Oblak, E., additional, Odriozola-Gimeno, M., additional, Palacio, J., additional, Palmeiro, B., additional, Para, A., additional, Parmaksiz, I., additional, Pelegrin, J., additional, Pérez Maneiro, M., additional, Querol, M., additional, Redwine, A.B., additional, Renner, J., additional, Rivilla, I., additional, Rodríguez, J., additional, Rogero, C., additional, Rogers, L., additional, Romeo, B., additional, Romo-Luque, C., additional, Santos, F.P., additional, dos Santos, J.M.F., additional, Simón, A., additional, Soleti, S.R., additional, Sorel, M., additional, Stanford, C., additional, Teixeira, J.M.R., additional, Toledo, J.F., additional, Torrent, J., additional, Usón, A., additional, Veloso, J.F.C.A., additional, Vuong, T.T., additional, Waiton, J., additional, and White, J.T., additional
Published: 2023
Full Text: View/download PDF

43. STEREO neutrino spectrum of 235U fission rejects sterile neutrino hypothesis

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., del Amo Sanchez, P., El Atmani, I., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Pessard, H., Réal, J.-S., Ricol, J.-S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., Vialat, M., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), and STEREO
Subjects: data analysis method, Multidisciplinary, antineutrino: spectrum, emission: spectrum, antineutrino/e: energy, antineutrino/e: energy spectrum, anomaly, neutrino: sterile, sensitivity, benchmark, weak interaction, neutrino: cosmic radiation, antineutrino: nuclear reactor, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], STEREO, flavor: 3, neutrino: mass, neutrino: oscillation, neutrino: geophysics, uranium: fission, experimental results
Abstract: International audience; Anomalies in past neutrino measurements have led to the discovery that these particles have non-zero mass and oscillate between their three flavors when they propagate. In the 2010's, similar anomalies observed in the antineutrino spectra emitted by nuclear reactors have triggered the hypothesis of the existence of a supplementary neutrino state that would be sterile i.e. not interacting via the weak interaction. The STEREO experiment was designed to study this scientific case that would potentially extend the Standard Model of Particle Physics. Here we present a complete study based on our full set of data with significantly improved sensitivity. Installed at the ILL (Institut Laue Langevin) research reactor, STEREO has accurately measured the antineutrino energy spectrum associated to the fission of 235U. This measurement confirms the anomalies whereas, thanks to the segmentation of the STEREO detector and its very short mean distance to the core (10~m), the same data reject the hypothesis of a light sterile neutrino. Such a direct measurement of the antineutrino energy spectrum suggests instead that biases in the nuclear experimental data used for the predictions are at the origin of the anomalies. Our result supports the neutrino content of the Standard Model and establishes a new reference for the 235U antineutrino energy spectrum. We anticipate that this result will allow to progress towards finer tests of the fundamental properties of neutrinos but also to benchmark models and nuclear data of interest for reactor physics and for observations of astrophysical or geo-neutrinos.
Published: 2023

44. Ba+2 ion trapping using organic submonolayer for ultra-low background neutrinoless double beta detector

Author: Herrero-Gómez, P., Calupitan, J. P., Ilyn, M., Berdonces-Layunta, A., Wang, T., de Oteyza, D. G., Corso, M., González-Moreno, R., Rivilla, I., Aparicio, B., Aranburu, A. I., Freixa, Z., Monrabal, F., Cossío, F. P., Gómez-Cadenas, J. J., Rogero, C., Adams, C., Almazán, H., Álvarez, V., Arazi, L., Arnquist, I. J., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Bounasser, S., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Conde, C. A. N., Contreras, T., Denisenko, A. A., Dey, E., Díaz, G., Dickel, T., Escada, J., Esteve, R., Fahs, A., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freitas, E. D. C., Generowicz, J., Goldschmidt, A., Guenette, R., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Morata, J. A. Hernando, Herrero, V., Ho, J., Ho, P., Ifergan, Y., Jones, B. J. P., Kekic, M., Labarga, L., Larizgoitia, L., Lebrun, P., Gutierrez, D. Lopez, López-March, N., Madigan, R., Mano, R. D. P., Martín-Albo, J., Martínez-Lema, G., Martínez-Vara, M., Meziani, Z. E., Miller, R., Mistry, K., Monteiro, C. M. B., Mora, F. J., Vidal, J. Muñoz, Navarro, K., Novella, P., Nuñez, A., Nygren, D. R., Oblak, E., Odriozola-Gimeno, M., Palmeiro, B., Para, A., Querol, M., Redwine, A. B., Renner, J., Ripoll, L., Rodríguez, J., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., dos Santos, J. M. F., Simón, A., Sorel, M., Stanford, C., Teixeira, J. M. R., Toledo, J. F., Torrent, J., Usón, A., Veloso, J. F. C. A., Vuong, T. T., Waiton, J., White, J. T., European Commission, European Research Council, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Generalitat Valenciana, Eusko Jaurlaritza, Fundação para a Ciência e a Tecnologia (Portugal), Pazy foundation, Department of Energy (US), Argonne National Laboratory (US), National Science Foundation (US), Fermilab, Welch Foundation, and Ministerio de Economía y Competitividad (España)
Subjects: Multidisciplinary, General Physics and Astronomy, General Chemistry, General Biochemistry, Genetics and Molecular Biology
Abstract: If neutrinos are their own antiparticles the otherwise-forbidden nuclear reaction known as neutrinoless double beta decay can occur. The very long lifetime expected for these exceptional events makes its detection a daunting task. In order to conduct an almost background-free experiment, the NEXT collaboration is investigating novel synthetic molecular sensors that may capture the Ba dication produced in the decay of certain Xe isotopes in a high-pressure gas experiment. The use of such molecular detectors immobilized on surfaces must be explored in the ultra-dry environment of a xenon gas chamber. Here, using a combination of highly sensitive surface science techniques in ultra-high vacuum, we demonstrate the possibility of employing the so-called Fluorescent Bicolor Indicator as the molecular component of the sensor. We unravel the ion capture process for these molecular indicators immobilized on a surface and explain the origin of the emission fluorescence shift associated to the ion trapping., This material is based upon work supported by the following agencies and institutions: the European Research Council (ERC) under ERC-2020-SyG 951281; the MCIN/AEI/10.13039/501100011033 of Spain and ERDF A way of making Europe under grants PID2020-114252GB-I00, PID2019-107338RB-C63, PID2019-104772GB-I00, PID2019-111281GB-I00, and RTI2018-095979, the Severo Ochoa Program grant CEX2018-000867-S; the Basque Government (GV/EJ) under grants IT-1553-22, IT-1591-22. The NEXT Collaboration acknowledges support from the following agencies and institutions: the European Union’s Framework Programme for Research and Innovation Horizon 2020 (2014-2020) under Grant Agreement No. 957202-HIDDEN; the MCIN/AEI of Spain and ERDF A way of making Europe under grants RTI2018-095979 and PID2021-125475NB, the Severo Ochoa Program grant CEX2018-000867-S and the Ramón y Cajal program grant RYC-2015-18820; the Generalitat Valenciana of Spain under grants PROMETEO/2021/087 and CIDEGENT/2019/049; the Department of Education of the Basque Government of Spain under the predoctoral training program non-doctoral research personnel; the Portuguese FCT under project UID/FIS/04559/2020 to fund the activities of LIBPhys-UC; the Pazy Foundation (Israel) under grants 877040 and 877041; the US Department of Energy under contracts number DE-AC02-06CH11357 (Argonne National Laboratory), DE-AC02-07CH11359 (Fermi National Accelerator Laboratory), DE-FG02-13ER42020 (Texas A&M), DE-SC0019054 (Texas Arlington) and DE-SC0019223 (Texas Arlington); the US National Science Foundation under award number NSF CHE 2004111; the Robert A Welch Foundation under award number Y-2031-20200401. Finally, we are grateful to the Laboratorio Subterráneo de Canfranc for hosting and supporting the NEXT experiment.
Published: 2022

45. Interpreting Reactor Antineutrino Anomalies with STEREO data

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lhuillier, J. Lamblin A. Letourneau D., Licciardi, M., Lindner, M., Materna, T., Pessard, H., Réal, J. -S., Ricol, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., and Vialat, M.
Subjects: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics - Experiment
Abstract: Anomalies in past neutrino measurements have led to the discovery that these particles have non-zero mass and oscillate between their three flavors when they propagate. In the 2010's, similar anomalies observed in the antineutrino spectra emitted by nuclear reactors have triggered the hypothesis of the existence of a supplementary neutrino state that would be sterile i.e. not interacting via the weak interaction. The STEREO experiment was designed to study this scientific case that would potentially extend the Standard Model of Particle Physics. Here we present a complete study based on our full set of data with significantly improved sensitivity. Installed at the ILL (Institut Laue Langevin) research reactor, STEREO has accurately measured the antineutrino energy spectrum associated to the fission of 235U. This measurement confirms the anomalies whereas, thanks to the segmentation of the STEREO detector and its very short mean distance to the core (10~m), the same data reject the hypothesis of a light sterile neutrino. Such a direct measurement of the antineutrino energy spectrum suggests instead that biases in the nuclear experimental data used for the predictions are at the origin of the anomalies. Our result supports the neutrino content of the Standard Model and establishes a new reference for the 235U antineutrino energy spectrum. We anticipate that this result will allow to progress towards finer tests of the fundamental properties of neutrinos but also to benchmark models and nuclear data of interest for reactor physics and for observations of astrophysical or geo-neutrinos., 21 pages, 13 figures
Published: 2022

46. Measurement of the Xe 136 two-neutrino double- ß -decay half-life via direct background subtraction in NEXT

Author: Novella, P., Sorel, M., Usón, A., Adams, C., Almazán, H., Álvarez, V., Aparicio, B., Aranburu, A. I., Arazi, L., Arnquist, I. J., Ayet, S., Azevedo, C. D. R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Bounasser, S., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrián, S., Church, E., Conde, C. A. N., Contreras, T., Cossío, F. P., Denisenko, A. A., Díaz, G., Díaz, J., Dickel, T., Escada, J., Esteve, R., Fahs, A., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Foss, F. W., Freitas, E. D. C., Freixa, Z., Generowicz, J., Goldschmidt, A., Gómez-Cadenas, J. J., González, R., González-Díaz, D., Guenette, R., Gutiérrez, R. M., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Hernando Morata, J. A., Herrero-Gómez, P., Herrero, V., Ho, J., Ifergan, Y., Jones, B. J. P., Kekic, M., Labarga, L., Laing, A., Larizgoitia, L., Lebrun, P., López Gutiérrez, D., López-March, N., Losada, M., Mano, R. D. P., Martín-Albo, J., Martínez, A., Martínez-Lema, G., Martínez-Vara, M., McDonald, A. D., Meziani, Z. E., Mistry, K., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Muñoz Vidal, J., Navarro, K., Nygren, D. R., Oblak, E., Odriozola-Gimeno, M., Palmeiro, B., Para, A., Pérez, J., Querol, M., Raymond, A., Redwine, A. B., Renner, J., Ripoll, L., Rivilla, I., Rodríguez García, Y., Rodríguez, J., Rogero, C., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., Dos Santos, J. M. F., Simón, A., Stanford, C., Teixeira, J. M. R., Thapa, P., Toledo, J. F., Torrent, J., Veloso, J. F. C. A., Vuong, T. T., Webb, R., White, J. T., Woodruff, K., Yahlali, N., and Collaboration, NEXT
Abstract: We report a measurement of the half-life of the Xe136 two-neutrino double-ß decay performed with a novel direct-background-subtraction technique. The analysis relies on the data collected with the NEXT-White detector operated with Xe136-enriched and Xe136-depleted xenon, as well as on the topology of double-electron tracks. With a fiducial mass of only 3.5 kg of Xe, a half-life of 2.34-0.46+0.80(stat)-0.17+0.30(sys)×1021yr is derived from the background-subtracted energy spectrum. The presented technique demonstrates the feasibility of unique background-model-independent neutrinoless double-ß-decay searches. © 2022 American Physical Society.
Published: 2022

47. Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment

Author: Almazán, H., primary, Bernard, L., additional, Blanchet, A., additional, Bonhomme, A., additional, Buck, C., additional, del Amo Sanchez, P., additional, El Atmani, I., additional, Labit, L., additional, Lamblin, J., additional, Letourneau, A., additional, Lhuillier, D., additional, Licciardi, M., additional, Lindner, M., additional, Materna, T., additional, Méplan, O., additional, Pessard, H., additional, Pignol, G., additional, Réal, J.-S., additional, Ricol, J.-S., additional, Roca, C., additional, Rogly, R., additional, Salagnac, T., additional, Sarrazin, M., additional, Savu, V., additional, Schoppmann, S., additional, Soldner, T., additional, Stutz, A., additional, and Vialat, M., additional
Published: 2022
Full Text: View/download PDF

48. STEREO neutrino spectrum of 235U fission rejects sterile neutrino hypothesis.

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., del Amo Sanchez, P., El Atmani, I., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Pessard, H., Réal, J.-S., Ricol, J.-S., Roca, C., and Rogly, R.
Abstract: Anomalies in past neutrino measurements have led to the discovery that these particles have non-zero mass and oscillate between their three flavours when they propagate. In the 2010s, similar anomalies observed in the antineutrino spectra emitted by nuclear reactors have triggered the hypothesis of the existence of a supplementary neutrino state that would be sterile, that is, not interacting by means of the weak interaction1. The STEREO experiment2–6 was designed to investigate this conjecture, which would potentially extend the standard model of particle physics. Here we present an analysis of the full set of data generated by STEREO, confirming observed anomalies while rejecting the hypothesis of a light sterile neutrino. Installed at the Institut Laue–Langevin (ILL) research reactor, STEREO accurately measures the antineutrino energy spectrum associated to the fission of 235U. The segmentation of the detector and its very short distance to the compact core are crucial properties of STEREO for our analysis. The measured antineutrino energy spectrum suggests that anomalies originate from biases in the nuclear experimental data used for the predictions7,8. Our result supports the neutrino content of the standard model and establishes a new reference for the 235U antineutrino energy spectrum. We anticipate that this result will allow progress towards finer tests of the fundamental properties of neutrinos but also to benchmark models and nuclear data of interest for reactor physics9,10 and for observations of astrophysical or geoneutrinos11,12.Accurate measurements of the antineutrino energy spectrum of 235U fission by the STEREO detector reject the sterile neutrino hypothesis and point to biases in the nuclear data to explain the discrepancies with the prediction. [ABSTRACT FROM AUTHOR]
Published: 2023
Full Text: View/download PDF

49. Ba+2 ion trapping using organic submonolayer for ultra-low background neutrinoless double beta detector.

Author: Herrero-Gómez, P., Calupitan, J. P., Ilyn, M., Berdonces-Layunta, A., Wang, T., de Oteyza, D. G., Corso, M., González-Moreno, R., Rivilla, I., Aparicio, B., Aranburu, A. I., Freixa, Z., Monrabal, F., Cossío, F. P., Gómez-Cadenas, J. J., Rogero, C., NEXT collaboration, Adams, C., Almazán, H., and Álvarez, V.
Subjects: NEUTRINOLESS double beta decay, ION traps, NUCLEAR reactions, FLUORESCENT probes, DETECTORS, ULTRAHIGH vacuum
Abstract: If neutrinos are their own antiparticles the otherwise-forbidden nuclear reaction known as neutrinoless double beta decay can occur. The very long lifetime expected for these exceptional events makes its detection a daunting task. In order to conduct an almost background-free experiment, the NEXT collaboration is investigating novel synthetic molecular sensors that may capture the Ba dication produced in the decay of certain Xe isotopes in a high-pressure gas experiment. The use of such molecular detectors immobilized on surfaces must be explored in the ultra-dry environment of a xenon gas chamber. Here, using a combination of highly sensitive surface science techniques in ultra-high vacuum, we demonstrate the possibility of employing the so-called Fluorescent Bicolor Indicator as the molecular component of the sensor. We unravel the ion capture process for these molecular indicators immobilized on a surface and explain the origin of the emission fluorescence shift associated to the ion trapping. One of the possible events signaling a neutrinoless double beta decay is a Xe atom decaying into a Ba ion and two electrons. Aiming at the realisation of a detector for such a process, the authors show that Ba ions can be efficiently trapped (chelated) in vacuum by an organic molecule layer on a surface. [ABSTRACT FROM AUTHOR]
Published: 2022
Full Text: View/download PDF

50. First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL

Author: STEREO collaboration, Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Pessard, H., Réal, J. -S., Ricol, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., Vialat, M., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Laue-Langevin (ILL), ILL, STEREO, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, data analysis method, Physics - Instrumentation and Detectors, FOS: Physical sciences, antineutrino/e: energy spectrum, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, symbols.namesake, High Energy Physics - Experiment (hep-ex), Distortion, 0103 physical sciences, Gaussian function, antineutrino: nuclear reactor, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, uranium: fission, Physics, antineutrino: spectrum, 235U spectrum shape, 010308 nuclear & particles physics, Spectrum (functional analysis), Detector, antineutrino/e: energy, Instrumentation and Detectors (physics.ins-det), antineutrino, Amplitude, unfolded spectrum, Yield (chemistry), symbols, STEREO, Energy (signal processing), Nominal power (photovoltaic), experimental results, 5 MeV exess
Abstract: This article reports the measurement of the $^{235}$U-induced antineutrino spectrum shape by the STEREO experiment. 43'000 antineutrinos have been detected at about 10 m from the highly enriched core of the ILL reactor during 118 full days equivalent at nominal power. The measured inverse beta decay spectrum is unfolded to provide a pure $^{235}$U spectrum in antineutrino energy. A careful study of the unfolding procedure, including a cross-validation by an independent framework, has shown that no major biases are introduced by the method. A significant local distortion is found with respect to predictions around $E_\nu \simeq 5.3$ MeV. A gaussian fit of this local excess leads to an amplitude of $A = 12.1 \pm 3.4\%$ (3.5$\sigma$)., Comment: This is the Accepted Manuscript version of an article accepted for publication in J. Phys. G: Nucl. Part. Phys.. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6471/abd37a. 34 pages, 14 figures
Published: 2021

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Database

Publisher

124 results on '"Almazán, H."'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources