Search

Your search keyword '"T. Lachenmaier"' showing total 30 results
Start Over Author "T. Lachenmaier"
30 results on '"T. Lachenmaier"'

1. The Double Chooz antineutrino detectors

Author

H. de Kerret, Y. Abe, C. Aberle, T. Abrahão, J. M. Ahijado, T. Akiri, J. M. Alarcón, J. Alba, H. Almazan, J. C. dos Anjos, S. Appel, F. Ardellier, I. Barabanov, J. C. Barriere, E. Baussan, A. Baxter, I. Bekman, M. Bergevin, A. Bernstein, W. Bertoli, T. J. C. Bezerra, L. Bezrukov, C. Blanco, N. Bleurvacq, E. Blucher, H. Bonet, M. Bongrand, N. S Bowden, T. Brugière, C. Buck, M. Buizza Avanzini, J. Busenitz, A. Cabrera, E. Caden, E. Calvo, L. Camilleri, R. Carr, S. Cazaux, J. M. Cela, M. Cerrada, P. J. Chang, P. Charon, E. Chauveau, P. Chimenti, T. Classen, A. P. Collin, E. Conover, J. M Conrad, S. Cormon, O. Corpace, B. Courty, J. I. Crespo-Anadón, M. Cribier, K. Crum, S. Cuadrado, A. Cucoanes, M. D’Agostino, E. Damon, J. V. Dawson, S. Dazeley, M. Dierckxsens, D. Dietrich, Z. Djurcic, F. Dorigo, M. Dracos, V. Durand, Y. Efremeko, M. Elnimr, A. Etenko, E. Falk, M. Fallot, M. Fechner, J. Felde, S. M. Fernandes, C. Fernández-Bedoya, D. Francia, D. Franco, V. Fischer, A. J. Franke, M. Franke, H. Furuta, F. Garcia, J. Garcia, I. Gil-Botella, L. Giot, A. Givaudan, M. Göger-Neff, H. Gomez, L. F. G. Gonzalez, L. Goodenough, M. C. Goodman, J. Goon, B. Gramlich, D. Greiner, A. Guertin, B. Guillon, S. M. Habib, Y. Haddad, T. Hara, F. X. Hartmann, J. Hartnell, J. Haser, A. Hatzikoutelis, D. Hellwig, S. Hervé, R. Hofacker, G. Horton-Smith, A. Hourlier, M. Ishitsuka, K. Jänner, S. Jiménez, J. Jochum, C. Jollet, F. Kaether, K. Kale, L. Kalousis, Y. Kamyshkov, M. Kaneda, D. M. Kaplan, M. Karakac, T. Kawasaki, E. Kemp, Y. Kibe, T. Kirchner, T. Konno, D. Kryn, T. Kutter, M. Kuze, T. Lachenmaier, C. E. Lane, C. Langbrandtner, T. Lasserre, C. Lastoria, L. Latron, C. Leonardo, A. Letourneau, D. Lhuillier, H. P. Lima, M. Lindner, J. M. López-Castaño, J. M. LoSecco, B. Lubsandorzhiev, S. Lucht, J. Maeda, C. N. Maesano, C. Mariani, J. Maricic, F. Marie, J. J. Martinez, J. Martino, T. Matsubara, D. McKee, F. Meigner, G. Mention, A. Meregaglia, J. P. Meyer, T. Miletic, R. Milincic, J. F. Millot, A. Minotti, V. Mirones, H. Miyata, Th. A. Mueller, Y. Nagasaka, K. Nakajima, D. Navas-Nicolás, Y. Nikitenko, P. Novella, L. Oberauer, M. Obolensky, A. Onillon, A. Oralbaev, I. Ostrovskiy, C. Palomares, S. J. M. Peeters, I. M. Pepe, S. Perasso, P. Perrin, P. Pfahler, A. Porta, G. Pronost, J. C. Puras, R. Quéval, J. L. Ramirez, J. Reichenbacher, B. Reinhold, M. Reissfelder, A. Remoto, D. Reyna, I. Rodriguez, M. Röhling, R. Roncin, N. Rudolf, B. Rybolt, Y. Sakamoto, R. Santorelli, F. Sato, U. Schwan, S. Schönert, S. Schoppmann, L. Scola, M. Settimo, M. A. Shaevitz, R. Sharankova, V. Sibille, J.-L. Sida, V. Sinev, D. Shrestha, M. Skorokhvatov, P. Soldin, J. Spitz, A. Stahl, I. Stancu, P. Starzynski, M. R. Stock, L. F. F. Stokes, M. Strait, A. Stüken, F. Suekane, S. Sukhotin, T. Sumiyoshi, Y. Sun, Z. Sun, R. Svoboda, H. Tabata, N. Tamura, K. Terao, A. Tonazzo, F. Toral, M. Toups, H. Trinh Thi, F. Valdivia, G. Valdiviesso, N. Vassilopoulos, A. Verdugo, C. Veyssiere, B. Viaud, D. Vignaud, M. Vivier, S. Wagner, C. Wiebusch, B. White, L. Winslow, M. Worcester, M. Wurm, J. Wurtz, G. Yang, J. Yáñez, F. Yermia, and K. Zbiri

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

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 $$\theta _{13}$$ θ 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.

Published
2022
Full Text
View/download PDF

2. Search for signatures of sterile neutrinos with Double Chooz

Author

T. Abrahão, H. Almazan, J. C. dos Anjos, S. Appel, J. C. Barriere, I. Bekman, T. J. C. Bezerra, L. Bezrukov, E. Blucher, T. Brugière, C. Buck, J. Busenitz, A. Cabrera, M. Cerrada, E. Chauveau, P. Chimenti, O. Corpace, J. V. Dawson, Z. Djurcic, A. Etenko, H. Furuta, I. Gil-Botella, A. Givaudan, H. Gomez, L. F. G. Gonzalez, M. C. Goodman, T. Hara, J. Haser, D. Hellwig, L. Heuermann, A. Hourlier, M. Ishitsuka, J. Jochum, C. Jollet, K. Kale, M. Kaneda, M. Karakac, T. Kawasaki, E. Kemp, H. de Kerret, D. Kryn, M. Kuze, T. Lachenmaier, C. E. Lane, T. Lasserre, C. Lastoria, D. Lhuillier, H. P. Lima Jr, M. Lindner, J. M. López-Casta no, J. M. LoSecco, B. Lubsandorzhiev, J. Maeda, C. Mariani, J. Maricic, J. Martino, T. Matsubara, G. Mention, A. Meregaglia, T. Miletic, R. Milincic, A. Minotti, D. Navas-Nicolás, P. Novella, L. Oberauer, M. Obolensky, A. Onillon, A. Oralbaev, C. Palomares, I. M. Pepe, G. Pronost, J. Reichenbacher, B. Reinhold, S. Schönert, S. Schoppmann, L. Scola, R. Sharankova, V. Sibille, V. Sinev, M. Skorokhvatov, P. Soldin, A. Stahl, I. Stancu, L. F. F. Stokes, F. Suekane, S. Sukhotin, T. Sumiyoshi, Y. Sun, C. Veyssiere, B. Viaud, M. Vivier, S. Wagner, C. Wiebusch, G. Yang, and F. Yermia

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

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 $${5 \times 10^{-3}}\,\mathrm{eV}^2 \lesssim \varDelta m^2_{41} \lesssim {3 \times 10^{-1}}\,\mathrm{eV}^2 $$ 5 × 10 - 3 eV 2 ≲ Δ m 41 2 ≲ 3 × 10 - 1 eV 2 for mixing angles down to $$\sin ^2 2\theta _{14} \gtrsim {0.02} $$ sin 2 2 θ 14 ≳ 0.02 . No significant disappearance additionally to the conventional disappearance related to $$\theta _{13} $$ θ 13 is observed and correspondingly exclusion bounds on the sterile mixing parameter $$\theta _{14} $$ θ 14 as a function of $$ \varDelta m^2_{41} $$ Δ m 41 2 are obtained.

Published
2021
Full Text
View/download PDF

3. Reactor rate modulation oscillation analysis with two detectors in Double Chooz

Author

The Double Chooz collaboration, T. Abrahão, H. Almazan, J. C. dos Anjos, S. Appel, J. C. Barriere, I. Bekman, T. J. C. Bezerra, L. Bezrukov, E. Blucher, T. Brugière, C. Buck, J. Busenitz, A. Cabrera, M. Cerrada, E. Chauveau, P. Chimenti, O. Corpace, J. V. Dawson, Z. Djurcic, A. Etenko, H. Furuta, I. Gil-Botella, A. Givaudan, H. Gomez, L. F. G. Gonzalez, M. C. Goodman, T. Hara, J. Haser, D. Hellwig, A. Hourlier, M. Ishitsuka, J. Jochum, C. Jollet, K. Kale, M. Kaneda, M. Karakac, T. Kawasaki, E. Kemp, H. de Kerret, D. Kryn, M. Kuze, T. Lachenmaier, C. E. Lane, T. Lasserre, C. Lastoria, D. Lhuillier, H. P. Lima, M. Lindner, J. M. López-Castaño, J. M. LoSecco, B. Lubsandorzhiev, J. Maeda, C. Mariani, J. Maricic, J. Martino, T. Matsubara, G. Mention, A. Meregaglia, T. Miletic, R. Milincic, A. Minotti, D. Navas-Nicolás, P. Novella, L. Oberauer, M. Obolensky, A. Onillon, A. Oralbaev, C. Palomares, I. M. Pepe, G. Pronost, J. Reichenbacher, B. Reinhold, S. Schönert, S. Schoppmann, L. Scola, R. Sharankova, V. Sibille, V. Sinev, M. Skorokhvatov, P. Soldin, A. Stahl, I. Stancu, L. F. F. Stokes, F. Suekane, S. Sukhotin, T. Sumiyoshi, Y. Sun, C. Veyssiere, B. Viaud, M. Vivier, S. Wagner, C. Wiebusch, G. Yang, and F. Yermia

Subjects
Neutrino Detectors and Telescopes (experiments), Oscillation, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract A θ 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 θ 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 ν ¯ e $$ {\overline{\nu}}_e $$ 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 9Li decays. The background-model-independent determination of the mixing angle yields sin2(2θ 13) = 0.094 ± 0.017, 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 θ 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
2021
Full Text
View/download PDF

4. Theia: an advanced optical neutrino detector

Author

M. Askins, Z. Bagdasarian, N. Barros, E. W. Beier, E. Blucher, R. Bonventre, E. Bourret, E. J. Callaghan, J. Caravaca, M. Diwan, S. T. Dye, J. Eisch, A. Elagin, T. Enqvist, V. Fischer, K. Frankiewicz, C. Grant, D. Guffanti, C. Hagner, A. Hallin, C. M. Jackson, R. Jiang, T. Kaptanoglu, J. R. Klein, Yu. G. Kolomensky, C. Kraus, F. Krennrich, T. Kutter, T. Lachenmaier, B. Land, K. Lande, J. G. Learned, V. Lozza, L. Ludhova, M. Malek, S. Manecki, J. Maneira, J. Maricic, J. Martyn, A. Mastbaum, C. Mauger, F. Moretti, J. Napolitano, B. Naranjo, M. Nieslony, L. Oberauer, G. D. Orebi Gann, J. Ouellet, T. Pershing, S. T. Petcov, L. Pickard, R. Rosero, M. C. Sanchez, J. Sawatzki, S. H. Seo, M. Smiley, M. Smy, A. Stahl, H. Steiger, M. R. Stock, H. Sunej, R. Svoboda, E. Tiras, W. H. Trzaska, M. Tzanov, M. Vagins, C. Vilela, Z. Wang, J. Wang, M. Wetstein, M. J. Wilking, L. Winslow, P. Wittich, B. Wonsak, E. Worcester, M. Wurm, G. Yang, M. Yeh, E. D. Zimmerman, S. Zsoldos, and K. Zuber

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract New developments in liquid scintillators, high-efficiency, fast photon detectors, and chromatic photon sorting have opened up the possibility for building a large-scale detector that can discriminate between Cherenkov and scintillation signals. Such a detector could reconstruct particle direction and species using Cherenkov light while also having the excellent energy resolution and low threshold of a scintillator detector. Situated deep underground, and utilizing new techniques in computing and reconstruction, this detector could achieve unprecedented levels of background rejection, enabling a rich physics program spanning topics in nuclear, high-energy, and astrophysics, and across a dynamic range from hundreds of keV to many GeV. The scientific program would include observations of low- and high-energy solar neutrinos, determination of neutrino mass ordering and measurement of the neutrino CP-violating phase $$\delta $$ δ , observations of diffuse supernova neutrinos and neutrinos from a supernova burst, sensitive searches for nucleon decay and, ultimately, a search for neutrinoless double beta decay, with sensitivity reaching the normal ordering regime of neutrino mass phase space. This paper describes Theia, a detector design that incorporates these new technologies in a practical and affordable way to accomplish the science goals described above.

Published
2020
Full Text
View/download PDF

5. Constraints on flavor-diagonal non-standard neutrino interactions from Borexino Phase-II

Author

The Borexino collaboration, S. K. Agarwalla, M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, D. Bick, G. Bonfini, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, L. Cappelli, P. Cavalcante, F. Cavanna, A. Chepurnov, K. Choi, D. D’Angelo, S. Davini, A. Derbin, A. Di Giacinto, V. Di Marcello, X. F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, K. Fomenko, A. Formozov, D. Franco, F. Gabriele, C. Galbiati, M. Gschwender, C. Ghiano, M. Giammarchi, A. Goretti, M. Gromov, D. Guffanti, C. Hagner, E. Hungerford, Aldo Ianni, Andrea Ianni, A. Jany, D. Jeschke, S. Kumaran, V. Kobychev, G. Korga, T. Lachenmaier, M. Laubenstein, E. Litvinovich, P. Lombardi, L. Ludhova, G. Lukyanchenko, L. Lukyanchenko, I. Machulin, G. Manuzio, S. Marcocci, J. Maricic, J. Martyn, E. Meroni, M. Meyer, L. Miramonti, M. Misiaszek, V. Muratova, B. Neumair, M. Nieslony, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Papp, Ö. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, G. Ranucci, A. Razeto, A. Re, M. Redchuk, A. Romani, N. Rossi, S. Rottenanger, S. Schönert, D. Semenov, M. Skorokhvatov, O. Smirnov, A. Sotnikov, C. Sun, Y. Suvorov, T. Takeuchi, R. Tartaglia, G. Testera, J. Thurn, E. Unzhakov, A. Vishneva, R. B. Vogelaar, F. von Feilitzsch, M. Wojcik, M. Wurm, O. Zaimidoroga, S. Zavatarelli, K. Zuber, and G. Zuzel

Subjects
Neutrino Physics, Beyond Standard Model, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The Borexino detector measures solar neutrino fluxes via neutrino-electron elastic scattering. Observed spectra are determined by the solar-ν e survival probability P ee (E), and the chiral couplings of the neutrino and electron. Some theories of physics beyond the Standard Model postulate the existence of Non-Standard Interactions (NSI’s) which modify the chiral couplings and P ee (E). In this paper, we search for such NSI’s, in particular, flavor-diagonal neutral current interactions that modify the ν e e and ν τ e couplings using Borexino Phase II data. Standard Solar Model predictions of the solar neutrino fluxes for both high- and low-metallicity assumptions are considered. No indication of new physics is found at the level of sensitivity of the detector and constraints on the parameters of the NSI’s are placed. In addition, with the same dataset the value of sin2 θ W is obtained with a precision comparable to that achieved in reactor antineutrino experiments .

Published
2020
Full Text
View/download PDF

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

Author

The Double Chooz collaboration, H. de Kerret, T. Abrahão, H. Almazan, J. C. dos Anjos, S. Appel, J. C. Barriere, I. Bekman, T. J. C. Bezerra, L. Bezrukov, E. Blucher, T. Brugière, C. Buck, J. Busenitz, A. Cabrera, M. Cerrada, E. Chauveau, P. Chimenti, O. Corpace, J. V. Dawson, Z. Djurcic, A. Etenko, D. Franco, H. Furuta, I. Gil-Botella, A. Givaudan, H. Gomez, L. F. G. Gonzalez, M. C. Goodman, T. Hara, J. Haser, D. Hellwig, A. Hourlier, M. Ishitsuka, J. Jochum, C. Jollet, K. Kale, M. Kaneda, M. Karakac, T. Kawasaki, E. Kemp, D. Kryn, M. Kuze, T. Lachenmaier, C. E. Lane, T. Lasserre, C. Lastoria, D. Lhuillier, H. P. Lima, M. Lindner, J. M. López-Castaño, J. M. LoSecco, B. Lubsandorzhiev, J. Maeda, C. Mariani, J. Maricic, J. Martino, T. Matsubara, G. Mention, A. Meregaglia, T. Miletic, R. Milincic, D. Navas-Nicolás, P. Novella, H. Nunokawa, L. Oberauer, M. Obolensky, A. Onillon, A. Oralbaev, C. Palomares, I. M. Pepe, G. Pronost, J. Reichenbacher, B. Reinhold, M. Settimo, S. Schönert, S. Schoppmann, L. Scola, R. Sharankova, V. Sibille, V. Sinev, M. Skorokhvatov, P. Soldin, A. Stahl, I. Stancu, L. F. F. Stokes, F. Suekane, S. Sukhotin, T. Sumiyoshi, Y. Sun, A. Tonazzo, C. Veyssiere, B. Viaud, M. Vivier, S. Wagner, C. Wiebusch, M. Wurm, G. Yang, and F. Yermia

Subjects
Neutrino Detectors and Telescopes (experiments), Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The yields and production rates of the radioisotopes 9Li and 8He created by cosmic muon spallation on 12C, have been measured by the two detectors of the Double Chooz experiment. The identical detectors are located at separate sites and depths, which means that they are subject to different muon spectra. The near (far) detector has an overburden of ∼120 m.w.e. (∼300 m.w.e.) corresponding to a mean muon energy of 32.1 ± 2.0 GeV (63.7 ± 5.5 GeV). Comparing the data to a detailed simulation of the 9Li and 8He decays, the contribution of the 8He radioisotope at both detectors is found to be compatible with zero. The observed 9Li yields in the near and far detectors are 5.51 ± 0.51 and 7.90 ± 0.51, respectively, in units of 10−8 μ −1g−1cm2. 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 9Li yield and the mean muon energy according to the power law Y = Y 0 E μ / 1 GeV α ¯ $$ Y = {Y}_0{\left(\left\langle {E}_{\mu}\right\rangle /1\ GeV\right)}^{\overline{\alpha}} $$ , giving α ¯ = 0.72 ± 0.06 $$ \overline{\alpha} = 0.72 \pm 0.06 $$ and Y 0 = (0.43 ± 0.11) × 10−8 μ −1g−1cm2. This relationship gives future liquid scintillator based experiments the ability to predict their cosmogenic 9Li background rates.

Published
2018
Full Text
View/download PDF

7. Ten years of cosmic muons observation with Borexino

Author

Davide D’Angelo, M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, D. Bick, G. Bonfini, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, L. Cappelli, P. Cavalcante, F. Cavanna, A. Chepurnov, K. Choi, D. D’Angelo, S. Davini, A. Derbin, A. Di Giacinto, V. Di Marcello, X.F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, K. Fomenko, A. Formozov, D. Franco, F. Gabriele, C. Galbiati, M. Gschwender, C. Ghiano, M. Giammarchi, A. Goretti, M. Gromov, D. Guffanti, C. Hagner, E. Hungerford, Aldo Ianni, Andrea Ianni, A. Jany, D. Jeschke, S. Kumaran, V. Kobychev, G. Korga, T. Lachenmaier, M. Laubenstein, E. Litvinovich, P. Lombardi, I. Lomskaya, L. Ludhova, G. Lukyanchenko, L. Lukyanchenko, I. Machulin, G. Manuzio, S. Marcocci, J. Maricic, J. Martyn, E. Meroni, M. Meyer, L. Miramonti, M. Misiaszek, V. Muratova, B. Neumair, M. Nieslony, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Papp, O. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, M.T. Ranalli, G. Ranucci, A. Razeto, A. Re, M. Redchuk, A. Romani, N. Rossi, S. Rottenanger, S. Schönert, D. Semenov, M. Skorokhvatov, O. Smirnov, A. Sotnikov, Y. Suvorov, R. Tartaglia, G. Testera, J. Thurn, E. Unzhakov, A. Vishneva, R.B. Vogelaar, F. von Feilitzsch, M. Wojcik, M. Wurm, O. Zaimidoroga, S. Zavatarelli, K. Zuber, and G. Zuzel

Subjects
Physics, History, Physics::Instrumentation and Detectors, precision measurement, flux [muon], pi, Astronomy, model [atmosphere], solar, Computer Science Applications, Education, Gran Sasso, modulation, correlation, high [energy], High Energy Physics::Experiment, Borexino, Cosmic muons, temperature [atmosphere], Nuclear Experiment
Abstract

The Borexino detector at Gran Sasso has now accumulated over ten years of continuous data which represent a magnificent opportunity to study the cosmic muon flux at a deep underground location. We present here a precision measurement of the flux and of the expected seasonal modulation. We present the correlation with the atmospheric temperature variations from global atmospheric models. We measure the correlation parameters and infer the kaon-to-pion ratio in the production of cosmic muons from high energy primaries. We also find evidence of a long term modulation that is not present in the atmospheric data and we investigate a possible positive correlation with the solar activity. Finally we observe a seasonal modulation of the production rate of cosmogenic neutrons that is in phase with the muon modulation but shows a surprisingly larger amplitude.

Published
2020
Full Text
View/download PDF

8. Updated geoneutrino measurement with Borexino

Author

S. Rottenanger, D. Franco, A. Caminata, B. Caccianiga, E. Unzhakov, I. Lomskaya, Andrea Ianni, L. Oberauer, M. Gschwender, I. Drachnev, K. Zuber, O. Zaimidoroga, V. Atroshchenko, D. Guffanti, O. Smirnov, C. Ghiano, R.B. Vogelaar, F. von Feilitzsch, A. Re, G. Bonfini, M. Wojcik, J. Martyn, G. Zuzel, B. Neumair, X.F. Ding, A. Razeto, K. Altenmüller, G. Manuzio, V. Di Marcello, V. Strati, F. Gabriele, M. Redchuk, D. Semenov, F. Mantovani, V. Orekhov, L. Miramonti, M. Vivier, M. Gromov, M. Nieslony, D. Jeschke, N. Rossi, A. Di Ludovico, D. Bick, A. Onillon, R. Tartaglia, Ö. Penek, C. Hagner, J. Thurn, M. Meyer, L. Cappelli, B. Ricci, S. Zavatarelli, L. Pietrofaccia, M. Montuschi, A. Pocar, E. Hungerford, G. Bellini, T. Lachenmaier, A. Romani, T. Lasserre, L. Papp, A. Goretti, D. Basilico, V. Muratova, A. Sotnikov, J. Maricic, S. Kumaran, C. Galbiati, M. Giammarchi, I. Machulin, Z. Bagdasarian, G. Korga, J. Benziger, M. Agostini, S. Marcocci, A. Derbin, S. Schöinert, M. Pallavicini, Y. Suvorov, F. Ortica, Livia Ludhova, M. Skorokhvatov, M. Misiaszek, G. Ranucci, S. Davini, S. Appel, V. Kobychev, M.T. Ranalli, A. Formozov, P. Lombardi, L. Lukyanchenko, M. Laubenstein, E. Meroni, A. Chepurnov, G. Fiorentini, G. Lukyanchenko, L. Di Noto, N. Pilipenko, E. Litvinovich, A. Di Giacinto, D. D'Angelo, D. Bravo, M. Wurm, Aldo Ianni, A. Vishneva, G. Raikov, F. Calaprice, G. Testera, F. Cavanna, L. Ludhova, P. Cavalcante, A. Jany, and K. Choi

Subjects
data analysis method, History, Particle physics, liquid [scintillation counter], Geoneutrino, Computer Science Applications, Education, geophysics [neutrino], statistics, Environmental science, Borexino, low [background], activity report, experimental results
Abstract

Borexino is a 280-ton liquid scintillator detector located at the Laboratori Nazionali del Gran Sasso (LNGS), Italy and is one of the two detectors that has measured geoneutrinos so far. The unprecedented radio-purity of the scintillator, the shielding with highly purified water, and the placement of the detector at a 3800 m w.e. depth have resulted in very low background levels and has made Borexino an excellent apparatus for geoneutrino measurements. The new update of the Borexino geoneutrino measurement, using the data obtained from December 2007 to April 2019, has been presented. Enhanced analysis techniques, adopted in this measurement, have been also presented (poster presentation #39 by S. Kumaran). The updated statistics and the new elaborate analysis have led to more than a factor two increase in exposure ((1.12 ± 0.05) × 1032 protons × yr) when compared to the latest Borexino result from 2015. The resulting geoneutrino signal of 47.0 − 7.7 + 8.4 ( stat ) − 1.9 + 2.4 ( sys ) TNU has − 17.2 + 18.3 % total precision. The geological interpretations of this measurement have been discussed. In particular, the 99% C.L. observation of the mantle signal by exploiting the relatively well-known lithospheric contribution, the estimation of the radiogenic heat, as well as the comparison of these results to the predictions based on different geological models. The upper limits on the power of a hypothetical georeactor that might be present at different locations inside the Earth have been set.

Published
2020
Full Text
View/download PDF

9. The high precision measurement of the 144Ce activity in the SOX experiment

Author

M Kaiser, Lino Miramonti, A Caminata, O Zaimidoroga, E. Hungerford, M. S. Meyer, G. Korga, S Marcocci, P Mosteiro, C Hagner, F. von Feilitzsch, S Farinon, V. Fischer, M Obolensky, O. Smirnov, A. Razeto, M. Durero, K Fomenko, C Galbiati, M Cribier, E Litvinovich, J. Gaffiot, Paolo Lombardi, M Wurm, M. Vivier, C Veyssière, V. N. Muratova, D. Kryn, M Montuschi, Thierry Lasserre, Matteo Agostini, K Choi, G Bellini, E Unzhakov, N. Rossi, L Perasso, I. S. Drachnev, L Scola, A. V. Derbin, M. Goeger-Neff, R. Tartaglia, H Wang, Jay Burton Benziger, Aldo Romani, T Lachenmaier, P. Cavalcante, N Jonquères, R. Musenich, M. Misiaszek, W Maneschg, L. Di Noto, A. Pocar, K. Althenmüller, N Berton, S. Schönert, D. Bravo Berguño, F. Lombardi, A. Sotnikov, Aldo Ianni, Lothar Oberauer, S. Davini, S. Manecki, J. Thurn, R. Roncin, T. Houdy, G. Testera, T. Lehnert, Gioacchino Ranucci, D Semenov, Andrea Ianni, Matthias Laubenstein, R. Cereseto, G Mention, D DAngelo, Kai Zuber, Marcin Wójcik, Y. Suvorov, M. Skorokhvatov, S. Zavatarelli, Livia Ludhova, V. V. Kobychev, D Bick, A. S. Chepurnov, A Goretti, Marco Pallavicini, S Weinz, F. Gabriele, Denis Korablev, J Link, G. Lukyanchenko, J. Winter, A Etenko, D. Franco, C Ghiano, Marco Giammarchi, G. Zuzel, Z Yokley, J. Maricic, S. Appel, R. B. Vogelaar, L. Papp, C Rossi, B Caccianiga, S. Sukhotin, I. N. Machulin, K Jedrzejczak, Fausto Ortica, M. Gromov, B. Neumair, V.N. Kornoukhov, M Toropova, Alessandra Re, G. Bonfini, Frank Calaprice, Hardy Simgen, E Meroni, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), SOX, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Di Noto, L., Agostini, M., Althenmueller, K., Appel, S., Bellini, G., Benziger, J., Berton, N., Bick, D., Bonfini, G., Bravo-Berguno, D., Caccianiga, B., Calaprice, F., Caminata, A., Cavalcante, P., Cereseto, R., Chepurnov, A., Choi, K., Cribier, M., Dangelo, D., Davini, S., Derbin, A., Drachnev, I., Durero, M., Etenko, A., Farinon, S., Fischer, V., Fomenko, K., Franco, D., Gabriele, F., Gaffiot, J., Galbiati, C., Ghiano, C., Giammarchi, M., Goeeger-Neff, M., Goretti, A., Gromov, M., Hagner, C., Houdy, Th, Hungerford, E., Ianni, Aldo, Ianni, Andrea, Jonqueres, N., Jedrzejczak, K., Kaiser, M., Kobychev, V., Korablev, D., Korga, G., Kornoukhov, V., Kryn, D., Lachenmaier, T., Lasserre, T., Laubenstein, M., Lehnert, T., Link, J., Litvinovich, E., Lombardi, F., Lombardi, P., Ludhova, L., Lukyanchenko, G., Machulin, I., Manecki, S., Maneschg, W., Marcocci, S., Maricic, J., Mention, G., Meroni, E., Meyer, M., Miramonti, L., Misiaszek, M., Montuschi, M., Mosteiro, P., Muratova, V., Musenich, R., Neumair, B., Oberauer, L., Obolensky, M., Ortica, F., Pallavicini, M., Papp, L., Perasso, L., Pocar, A., Ranucci, G., Razeto, A., Re, A., Romani, A., Roncin, R., Rossi, C., Rossi, N., Schoenert, S., Scola, L., Semenov, D., Simgen, H., Skorokhvatov, M., Smirnov, O., Sotnikov, A., Sukhotin, S., Suvorov, Y., Tartaglia, R., Testera, G., Thurn, J., Toropova, M., Veyssiere, C., Vivier, M., Unzhakov, E., Vogelaar, R. B., von Feilitzsch, F., Wang, H., Weinz, S., Winter, J., Wojcik, M., Wurm, M., Yokley, Z., Zaimidoroga, O., Zavatarelli, S., Zuber, K., and Zuzel, G.

Subjects
History, Particle physics, Water flow, Physics::Instrumentation and Detectors, tungsten, water, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Particle detector, Education, Physics::Geophysics, thermal, Nuclear physics, Physics and Astronomy (all), alloy, 0103 physical sciences, ddc:530, 010306 general physics, Neutrino oscillation, Nuclear Experiment, background: radioactivity, Borexino, Physics, 010308 nuclear & particles physics, precision measurement, calorimeter: design, Detector, antineutrino, Computer Science Applications, Gran Sasso, cerium, flow, Measuring instrument, High Energy Physics::Experiment, neutrino: oscillation, Neutrino, Lepton
Abstract

International audience; In order to perform a resolutive measurement to clarify the neutrino anomalies and to observe possible short distance neutrino oscillations, the SOX (Short distance neutrino Oscillations with BoreXino) experiment is under construction. In the first phase, a 100 kCi (144)Ce-(144)Pr antineutrino source will be placed under the Borexino detector at the Laboratori Nazionali del Gran Sasso (LNGS), in center of Italy, and the rate measurement of the antineutrino events, observed by the very low radioactive background Borexino detector, will be compared with the high precision (< 1%) activity measurement performed by two calorimeters. The source will be embedded in a 19 mm thick tungsten alloy shield and both the calorimeters have been conceived for measuring the thermal heat absorbed by a water flow. In this report the design of the calorimeters will be described in detail and very preliminary results will be also shown.

Published
2016
Full Text
View/download PDF

10. Prospects for large-volume neutrino detectors

Author

T. Lachenmaier

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, business.industry, Detector, Volume (computing), Scintillator, Atomic and Molecular Physics, and Optics, Neutrino detector, Liquid argon, High Energy Physics::Experiment, Aerospace engineering, Neutrino, business, Realization (systems), Cherenkov radiation
Abstract

Large-volume neutrino observatories based on monolithic liquid targets are discussed, as they are clearly able to address key issues of particle and astro-particle physics by extrapolating existing neutrino detection technologies. There is a growing effort in the US, Europe and Japan for the realization of such projects. Three detector technologies are under discussion: water Cherenkov detectors, liquid argon Time Projection chambers, and a liquid scintillator-based detector. A general overview on the motivation, some selected examples for the physics potential, and a short discussion of the status of various projects is given.

Published
2011
Full Text
View/download PDF

11. Detectors with Ir/Au-thermometers for high count rate tests in the CRESST experiment

Author

H. R. T. Wulandari, W. Rau, M. Razeti, J. Schnagl, W. Westphal, K. Rottler, T. Lachenmaier, M. Stark, Th. Jagemann, W. Potzel, J. Jochum, J.-C. Lanfranchi, D. Wernicke, Franz von Feilitzsch, and M. E. Huber

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Physics::Instrumentation and Detectors, business.industry, Detector, Electron, Nuclear physics, Cryogenic Rare Event Search with Superconducting Thermometers, Optics, Measuring instrument, Calibration, High Energy Physics::Experiment, Neutron, Transition edge sensor, business, Instrumentation
Abstract

With simultaneous measurement of the temperature signal and the scintillation light of a CaWO4 absorber crystal, it is possible to reject the gamma and electron background in the Cryogenic Rare Event Search with Superconducting Thermometers experiment. In order to understand the different events from various particles correctly a neutron calibration experiment and other tests are necessary. Using an existing accelerator facility these tests will be performed above ground. For such an experiment, a detector with good stability at high count rates is necessary. The detectors used in the Gran Sasso Laboratory are equipped with W-thermometers. They show long decay times and need active stabilisation and therefore are not well suitable for experiments with high count rates. We report on developments and first results on detectors based on Ir/Au-thermometers in electrothermal feedback mode.

Published
2004
Full Text
View/download PDF

12. Neutrino properties and neutrino astronomy: Where do we stand, where are we going? — experiments

Author

M. Spiro and T. Lachenmaier

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, Astronomy, Solar neutrino problem, Atomic and Molecular Physics, and Optics, Neutrino detector, Mikheyev–Smirnov–Wolfenstein effect, Computer Science::Programming Languages, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Neutrino astronomy, Neutrino oscillation
Abstract

We have been witnessing during the “XXth International Conference on Neutrino Physics and Astrophysics (Neutrino 2002)” in Munich a lot of new and exciting results. Neutrino physics is blooming. This paper is only reflecting part of the richness of this expanding field.

Published
2003
Full Text
View/download PDF

13. Direct dark matter search with CRESST and EURECA

Author

M. Kiefer, T. Lachenmaier, A. Bento, I. Usherov, A. Gütlein, S. Scholl, W. Seidel, W. Potzel, D. Hauff, Franz von Feilitzsch, Andreas Erb, C. Coppi, K. Schäffner, Andrew Brown, J. Schmaler, G. Deuter, C. Sailer, F. Pröbst, J. Jochum, S. Ingelby, Martin Hofmann, S. Pfister, K. Rottler, C. Bucci, C. Isaila, R. McGowan, M. Bauer, C. Ciemniak, S. Roth, M. Malek, F. Petricca, H. Kraus, S. Henry, B. Majorovits, W. Westphal, V.B. Mikhailik, I. Bavykina, M. v. Sivers, J. Imber, G. Angloher, M. Kimmerle, Leo Stodolsky, E. Pantic, R. D. Strauss, P. Huff, J.-C. Lanfranchi, A. J. B. Tolhurst, and R. F. Lang

Subjects
Physics, Cryogenic Rare Event Search with Superconducting Thermometers, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Weakly interacting massive particles, European Underground Rare Event Calorimeter Array, Detector, Dark matter, Astrophysics::Instrumentation and Methods for Astrophysics, High Energy Physics::Experiment, Cryogenic Dark Matter Search
Abstract

The current status of the direct Dark Matter experiments CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) and the planned EURECA (European Underground Rare Event Calorimeter Array) is presented. Both experiments are aimed at the direct detection of WIMPs (Weakly Interacting Massive Particles), potential candidates for the Dark Matter in the universe. New design developments of the cryogenic detectors operated at mK temperatures are investigated to optimize detector performance and to simplify mass production. Thus, CRESST is also providing a basis for the EURECA project, aimed at a ton of cryogenic detectors with a multi-material target. © 2010 Elsevier B.V. All rights reserved.

Published
2010
Full Text
View/download PDF

14. Physics with the large liquid-scintillator detector LENA

Author

T. Lachenmaier, J. Peltoniemi, Michael Wurm, Q. Meindl, R. Möllenberg, W. Potzel, M. Göger-Neff, F. von Feilitzsch, T. Lewke, T. Marrodán Undagoitia, M. Tippmann, Lothar Oberauer, and J. Winter

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Neutrino detector, Physics::Instrumentation and Detectors, Proton decay, Physics beyond the Standard Model, Detector, Rare events, High Energy Physics::Experiment, Scintillator, Neutrino astronomy
Abstract

A large liquid-scintillator detector with 50 kt target mass in an underground location of at least 4000 m.w.e. is considered as a unique tool for low-energy neutrino detection and the search for rare events from astrophysical sources and up to now unobserved processes beyond the Standard Model. In this contribution, the physics potential of LENA for selected topics is discussed.

Published
2010
Full Text
View/download PDF

15. Cryogenic detectors – a promising option for GNO?

Author

S. Wänninger, J.-C. Lanfranchi, T. Lachenmaier, M.L. Sarsa, M. Altmann, J. Schnagl, and Franz von Feilitzsch

Subjects
Systematic error, Physics, Nuclear and High Energy Physics, Nuclear engineering, Detector, Nanotechnology, GALLEX, Instrumentation
Abstract

An improvement of the statistical and systematic uncertainty beyond the level achieved in GALLEX is an essential prerequisite for GNO. As major contributions to these errors are associated with the detection of the EC-decay of 71 Ge in miniaturized gas counters, low-temperature calorimetric detectors (LTCs) might provide a promising alternative for a later phase of GNO. We report the status of our R&D project on optimization of LTCs for this application.

Published
2000
Full Text
View/download PDF

16. Quenching factor measurement for by neutron scattering

Author

W. Rau, C. Coppi, J. König, Josef Jochum, D. Wernicke, T. Lachenmaier, W. Westphal, W. Potzel, Th. Jagemann, C. Isaila, M. Stark, J.-C. Lanfranchi, and Franz von Feilitzsch

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Physics::Instrumentation and Detectors, Scattering, Nuclear Theory, Neutron diffraction, Electron, Neutron scattering, Ionizing radiation, Nuclear physics, Neutron source, Neutron, Nuclear Experiment, Instrumentation
Abstract

The CaWO 4 detectors of CRESST are able to distinguish electron recoils as induced by ionizing radiation from nuclear recoils as expected from heavy dark matter particles (WIMPs) thanks to the coincident measurement of the phonon and scintillation light signals produced in an event. For a detailed understanding of the detector response to nuclear recoils, especially the light yield or quenching factor, measurements with different neutron sources have been performed. Standard neutron sources such as Am–Be yield some information but a better separation of the signals from the different nuclei can be obtained by a monoenergetic pulsed neutron source when additionally measuring the scattered neutrons. Such an experiment has been set up at the tandem accelerator at the Maier–Leibnitz Laboratory in Garching. Results from a first series of measurements at room temperature will be presented as well as the status of the experiment towards cryogenic measurements.

Published
2006
Full Text
View/download PDF

17. Detector calibration measurements in CRESST

Author

C. Coppi, Josef Jochum, J. König, W. Westphal, T. Lachenmaier, Th. Jagemann, M. Stark, C. Isaila, W. Potzel, W. Rau, D. Wernicke, Franz von Feilitzsch, and J.-C. Lanfranchi

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Physics::Instrumentation and Detectors, business.industry, Detector, Dark matter, Electron, Crystal, Recoil, Optics, Calibration, Optoelectronics, Transition edge sensor, business, Instrumentation
Abstract

The CRESST dark matter experiment uses the simultaneous measurement of the scintillation light and the heat signal of a CaWO 4 crystal to discriminate between background electron recoil and nuclear recoil events. At the Technical University of Munich calibration measurements have been performed to characterize the detectors. These measurements include the determination of the light output and scintillation time constants of CaWO 4 at temperatures below 50 mK. The setup used in these measurements consist of a CaWO 4 crystal, which is mounted in a reflective housing together with a silicon light detector carrying an Ir/Au transition edge sensor (TES) evaporated directly onto it.

Published
2006
Full Text
View/download PDF

18. Scintillation light detectors with Neganov–Luke amplification

Author

P. Goldstraß, Franz von Feilitzsch, C. Isaila, J. Kemmer, T. Lachenmaier, W. Rau, W. Westphal, M. Stark, A. Pahlke, D. Wernicke, W. Potzel, J.-C. Lanfranchi, C. Coppi, Josef Jochum, O. Boslau, and Th. Jagemann

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Silicon, Physics::Instrumentation and Detectors, business.industry, Detector, chemistry.chemical_element, Noise (electronics), Signal, Monocrystalline silicon, Cryogenic Rare Event Search with Superconducting Thermometers, Optics, chemistry, Optoelectronics, Transition edge sensor, business, Instrumentation
Abstract

For an active suppression of the gamma and electron background in the Cryogenic Rare Event Search with Superconducting Thermometers (CRESST) dark matter experiment both phonons and scintillation light generated in a CaWO 4 crystal are detected simultaneously. The phonon signal is read out by a transition edge sensor (TES) on the CaWO 4 crystal. For light detection a silicon absorber equipped with a TES is employed. An efficient background discrimination requires very sensitive light detectors. The threshold can be improved by applying an electric field to the silicon crystal leading to an amplification of the thermal signal due to the Neganov–Luke effect. Measurements showing the improved sensitivity of the light detectors as well as future steps for reducing the observed extra noise will be presented.

Published
2006
Full Text
View/download PDF

19. Development of a cryogenic detection concept for GNO

Author

W. Potzel, J.-C. Lanfranchi, T. Lachenmaier, and F. von Feilitzsch

Subjects
Physics, Cryostat, Nuclear and High Energy Physics, Solar neutrino, Nuclear engineering, Thermal, Electromagnetic shielding, Measuring instrument, Astrophysics, Neutrino, Instrumentation, Decoupling (electronics), Particle detector
Abstract

The Gallium-Neutrino-Experiment at GNO measures solar neutrinos radiochemically via the reaction 71Ga(ν,e)71Ge. In order to reduce statistical and systematic uncertainties in detecting the decay of 71Ge to 71Ga, a favourable way could be the use of high-resolution cryogenic detectors instead of the presently integrated miniaturized proportional counters. After the successful development of a highly efficient 4π-detector, optimization of thermal Ge-deposition and decoupling of deposition and detection, present activity concentrates on low background considerations, enhancement of external and internal shielding of the cryostat and a long-term run with artificially activated 71Ge to prove the feasibility of ‘cryoGNO’ in our Underground Laboratory in Garching.

Published
2004
Full Text
View/download PDF

20. Indication of reactor ν(e) disappearance in the Double Chooz experiment

Author

Y, Abe, C, Aberle, T, Akiri, J C, dos Anjos, F, Ardellier, A F, Barbosa, A, Baxter, M, Bergevin, A, Bernstein, T J C, Bezerra, L, Bezrukhov, E, Blucher, M, Bongrand, N S, Bowden, C, Buck, J, Busenitz, A, Cabrera, E, Caden, L, Camilleri, R, Carr, M, Cerrada, P-J, Chang, P, Chimenti, T, Classen, A P, Collin, E, Conover, J M, Conrad, S, Cormon, J I, Crespo-Anadón, M, Cribier, K, Crum, A, Cucoanes, M V, D'Agostino, E, Damon, J V, Dawson, S, Dazeley, M, Dierckxsens, D, Dietrich, Z, Djurcic, M, Dracos, V, Durand, Y, Efremenko, M, Elnimr, Y, Endo, A, Etenko, E, Falk, M, Fallot, M, Fechner, F, von Feilitzsch, J, Felde, S M, Fernandes, D, Franco, A J, Franke, M, Franke, H, Furuta, R, Gama, I, Gil-Botella, L, Giot, M, Göger-Neff, L F G, Gonzalez, M C, Goodman, J T M, Goon, D, Greiner, B, Guillon, N, Haag, C, Hagner, T, Hara, F X, Hartmann, J, Hartnell, T, Haruna, J, Haser, A, Hatzikoutelis, T, Hayakawa, M, Hofmann, G A, Horton-Smith, M, Ishitsuka, J, Jochum, C, Jollet, C L, Jones, F, Kaether, L, Kalousis, Y, Kamyshkov, D M, Kaplan, T, Kawasaki, G, Keefer, E, Kemp, H, de Kerret, Y, Kibe, T, Konno, D, Kryn, M, Kuze, T, Lachenmaier, C E, Lane, C, Langbrandtner, T, Lasserre, A, Letourneau, D, Lhuillier, H P, Lima, M, Lindner, Y, Liu, J M, López-Castanõ, J M, LoSecco, B K, Lubsandorzhiev, S, Lucht, D, McKee, J, Maeda, C N, Maesano, C, Mariani, J, Maricic, J, Martino, T, Matsubara, G, Mention, A, Meregaglia, T, Miletic, R, Milincic, A, Milzstajn, H, Miyata, D, Motta, Th A, Mueller, Y, Nagasaka, K, Nakajima, P, Novella, M, Obolensky, L, Oberauer, A, Onillon, A, Osborn, I, Ostrovskiy, C, Palomares, S J M, Peeters, I M, Pepe, S, Perasso, P, Perrin, P, Pfahler, A, Porta, W, Potzel, R, Queval, J, Reichenbacher, B, Reinhold, A, Remoto, D, Reyna, M, Röhling, S, Roth, H A, Rubin, Y, Sakamoto, R, Santorelli, F, Sato, S, Schönert, S, Schoppmann, U, Schwan, T, Schwetz, M H, Shaevitz, D, Shrestha, J-L, Sida, V, Sinev, M, Skorokhvatov, E, Smith, J, Spitz, A, Stahl, I, Stancu, M, Strait, A, Stüken, F, Suekane, S, Sukhotin, T, Sumiyoshi, Y, Sun, Z, Sun, R, Svoboda, H, Tabata, N, Tamura, K, Terao, A, Tonazzo, M, Toups, H H, Trinh Thi, C, Veyssiere, S, Wagner, H, Watanabe, B, White, C, Wiebusch, L, Winslow, M, Worcester, M, Wurm, E, Yanovitch, F, Yermia, K, Zbiri, and V, Zimmer

Abstract

The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio of events of 0.944±0.016(stat)±0.040(syst) was obtained in 101 days of running at the Chooz nuclear power plant in France, with two 4.25 GW(th) reactors. The results were obtained from a single 10 m(3) fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 flux measurement after correction for differences in core composition. The deficit can be interpreted as an indication of a nonzero value of the still unmeasured neutrino mixing parameter sin(2)2θ(13). Analyzing both the rate of the prompt positrons and their energy spectrum, we find sin(2)2θ(13)=0.086±0.041(stat)±0.030(syst), or, at 90% C.L., 0.017sin(2)2θ(13)0.16.

Published
2012

21. Solar and Atmospheric Neutrinos: Background Sources for the Direct Dark Matter Searches

Author

N. Haag, W. Potzel, A. Zöller, F. von Feilitzsch, S. Pfister, Lothar Oberauer, S. Roth, Martin Hofmann, M. von Sivers, J.-C. Lanfranchi, A. Gütlein, C. Ciemniak, R. D. Strauss, C. Isaila, T. Lachenmaier, Physik-Department E15, and Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM)

Subjects
direct dark matter search, Coherent neutrino nucleus scattering, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Physics::Instrumentation and Detectors, Solar neutrino, Dark matter, FOS: Physical sciences, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Nuclear physics, High Energy Physics - Phenomenology (hep-ph), Xenon, WIMP, 0103 physical sciences, 010306 general physics, Light dark matter, Physics, 010308 nuclear & particles physics, Astronomy and Astrophysics, atmospheric neutrinos, High Energy Physics - Phenomenology, chemistry, 13. Climate action, solar neutrinos, Weakly interacting massive particles, Neutrino, Nucleon
Abstract

In experiments for direct dark matter searches, neutrinos coherently scattering off nuclei can produce similar events as Weakly Interacting Massive Particles (WIMPs). The calculated count rate for solar neutrinos in such experiments is a few events per ton-year. This count rate strongly depends on the nuclear recoil energy threshold achieved in the experiments for the WIMP search. We show that solar neutrinos can be a serious background source for direct dark matter search experiments using Ge, Ar, Xe and CaWO_4 as target materials. To reach sensitivities better than approximatly 10^-10 pb for the elastic WIMP nucleon spin-independent cross section in the zero-background limit, energy thresholds for nuclear recoils should be approximatly >2.05 keV for CaWO_4, >4.91 keV for Ge, >2.89 keV for Xe, and >8.62 keV for Ar as target material. Next-generation experiments should not only strive for a reduction of the present energy thresholds but mainly focus on an increase of the target mass. Atmospheric neutrinos limit the achievable sensitivity for the background-free direct dark matter search to approximatly >10^-12 pb., accepted by Astroparticle Physics

Published
2010
Full Text
View/download PDF

22. White paper report on using nuclear reactors to search for a value of theta13

Author

M. Longo, I. Stancu, C. Lendvai, J.J. Grudzinski, L. Mikaelyan, N. Stanton, M. Tanimoto, Jan Conrad, W. Potzel, V. Sinev, C. Mauger, N. Tamura, S. Choubey, G. A. Horton-Smith, E. Yakushev, Y.S. Lu, H. Nunokawa, J. Sims, M. Goger-Neff, J. Klein, B. Roe, R. Stefanski, T. Lasserre, K.T. Knopfle, O. Yasuda, D. Demutrh, P. Kasper, F. Gray, J. Thron, O. Dadoun, T. Lachenmaier, J.C. Anjos, Lothar Oberauer, E. Blucher, C. Buck, W. Hofmann, J. M. Link, R. Kadel, B.E. Berger, J. Beacom, T. Bolton, S. Sukhotin, T. Schwertz, K. M. Heeger, J. Pilcher, R. Shellard, D. Reyna, S. Schonert, H. Jostlein, P. Giusti, M. Selvi, H. Wong, H. Minakata, P. Rapidis, F. von Feilitzsch, J.A. Formaggio, O.L.G. Peres, R. Plunkett, E. von Toerne, V.P. Martemyanov, Y. Sakamoto, Yu. Kozlov, D. Kryn, Y. Efremenko, M. Obolensky, D. Ayres, Patrick Huber, J.P. Meyer, Z. Wang, R. Sidwell, Andre de Gouvea, K. Anderson, B.K. Fujikawa, F. Dessages-Ardellier, C. Grieb, F. Hartmann, V. Kuchler, D. Naples, S. Parke, Robert Svoboda, D. Finley, R. McKeown, G. Mention, F. Seukane, D. Kaplan, J. Li, I. Bediaga, C.G. Yang, D. Vignaud, J. Busenitz, M. Cribier, H. Sugiyama, H. Manghetti, J. Kersten, Y.Q. Ma, R. Shrock, H. de Kerret, R. Talaga, L. Inzhechik, M. Rolinec, V. Kopeikin, C. Wagner, G. Sartorelli, W. Bugg, F. Dalnoki-Veress, S.T. Petcov, G. Raffelt, M. Kuze, J. Jochum, M. H. Shaevitz, K.B. Luk, Caren Hagner, C. Laughton, V.J. Guarino, Manfred Lindner, Yuri Kamyshkov, Y.F. Wang, A. de Bellefon, Maury Goodman, T. Sumiyoshi, M. Decowski, W. Winter, S.J. Freedman, S. Bilenky, and M. Garbini

Subjects
Nuclear physics, Physics, Particle physics, Neutrino detector, Order (ring theory), CP violation, Elementary particle, Weinberg angle, Neutrino, Neutrino oscillation, Mixing (physics)
Abstract

There has been superb progress in understanding the neutrino sector of elementary particle physics in the past few years. It is now widely recognized that the possibility exists for a rich program of measuring CP violation and matter effects in future accelerator {nu} experiments, which has led to intense efforts to consider new programs at neutrino superbeams, off-axis detectors, neutrino factories and beta beams. However, the possibility of measuring CP violation can be fulfilled only if the value of the neutrino mixing parameter {theta}{sub 13} is such that sin{sup 2} (2{theta}{sub 13}) greater than or equal to on the order of 0.01. The authors of this white paper are an International Working Group of physicists who believe that a timely new experiment at a nuclear reactor sensitive to the neutrino mixing parameter {theta}{sub 13} in this range has a great opportunity for an exciting discovery, a non-zero value to {theta}{sub 13}. This would be a compelling next step of this program. We are studying possible new reactor experiments at a variety of sites around the world, and we have collaborated to prepare this document to advocate this idea and describe some of the issues that are involved.

Published
2004
Full Text
View/download PDF

23. Development of cryogenic detectors for GNO

Author

F. v. Feilitzsch, W. Potzel, A. Rüdig, J. Jochum, H. R. T. Wulandari, T. Lachenmaier, J.-C. Lanfranchi, Th. Jagemann, M. Stark, and J. Schnagl

Subjects
Physics, Nuclear physics, Cosmic neutrino background, Particle physics, Neutrino detector, Physics::Instrumentation and Detectors, Solar neutrino, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Solar neutrino problem, Particle detector, Semiconductor detector
Abstract

The neutrino capture reaction 71Ga(νe,e−)71Ge and the reverse EC-decay is used by GNO to monitor the flux of solar neutrinos in a routinely operating neutrino observatory. Low temperature detectors (LTDs) offer a better performance concerning efficiency, energy resolution and threshold than the proportional counters that are used now. We report on measurements with a detector setup with absorption in 4 π and counting efficiency near 100%. Activated germanium has been integrated succesfully in the LTD setup by thermal decomposition of GeH4.

Published
2002
Full Text
View/download PDF

24. Linearity investigations and pulse shape analysis of high resolution STJ X-ray detectors

Author

T. Lachenmaier, M. E. Huber, F. v. Feilitzsch, J. Jochum, J. Schnagl, G. Angloher, A. Rüdig, J.-C. Lanfranchi, M. Stark, Th. Jagemann, H. R. T. Wulandari, and W. Potzel

Subjects
Physics, business.industry, Detector, X-ray detector, Linearity, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Pulse shaping, Particle detector, Tunnel effect, Optics, Condensed Matter::Superconductivity, Superconducting tunnel junction, Absorption (electromagnetic radiation), business
Abstract

A slight deviation from linearity has been detected for single aluminum superconducting tunnel junction (Al-STJ) detectors in the energy range between E=1.74 keV and E=6.49 keV. The nonlinearity can be explained by the escape of recombination phonons into the substrate. Varying the size of the junction shows that the recombination of the quasiparticles takes place after their diffusive propagation across the junction. Pulse shape analysis allows to identify background events that are caused by photo-and Auger-electron propagation. For a detector system based on a Al-STJ with a Pb absorber pulse shape analysis allows to separate events related to absorption in the STJ and in the absorber.

Published
2002
Full Text
View/download PDF

25. Scintillation light and phonon measurement based on Ir/Au-thermometers

Author

J. Schnagl, Th. Jagemann, F. v. Feilitzsch, H. R. T. Wulandari, M. Stark, M. E. Huber, W. Potzel, J.-C. Lanfranchi, A. Rüdig, J. Jochum, T. Lachenmaier, and T. Frank

Subjects
Physics, Scintillation, Physics::Instrumentation and Detectors, Phonon, business.industry, Transition temperature, Detector, Electromagnetic radiation, Particle detector, Crystal, Optics, Condensed Matter::Superconductivity, Thermometer, business
Abstract

With the simultaneous measurement of the temperature signal of a CaWO4 absorber crystal and the scintillation light, it is possible to reject the gamma and electron background in the search for dark matter particles. We report on an alternative new light detector design for the CRESST experiment. For the light detector we use iridium/gold phase transition thermometers with a special circular structure and an Al phonon collector on a silicon substrate. With this detector an energy threshold of 22.3 eV on a 5 σ level was achieved. The light detector was tested in coincidence with a phonon measurement of a 300 g CaWO4 crystal. The phonons from the CaWO4 crystal were measured with an Ir/Au thermometer with a transition temperature of 32 mK.

Published
2002
Full Text
View/download PDF

27. EURECA - The future of cryogenic dark matter detection in Europe

Author

J. Gascon, D. Filosofov, S. Marnieros, K. Schäffner, Philippe Gandit, O. G. Polischuk, M. Stern, B. Paul, Alessandro Monfardini, S. Semikh, A. S. Nikolaiko, M. Kiefer, F. Haug, José Villar, A. Lubashevsky, A. Torrento, O. Crauste, L. Bornschein, M.L. Sarsa, S. Scholl, W. Potzel, Y. Ortigoza, A.A. Smolnikov, W. Seidel, P. Di Stefano, J. Puimedon, E. Garcia, M. Gros, A. Broniatowski, Leo Stodolsky, E. Pantic, M. Chapellier, P. Pari, M. Malek, Philippe Camus, X-F. Navick, E. Yakushev, J. Domange, A. Bento, M. Kimmerle, V. A. Kudryavtsev, P. Huff, S. Pfister, J. Wolf, Lothar Oberauer, M. Bauer, F. Petricca, K. Rottler, C. Coppi, A. Salinas, T. Lachenmaier, Alain Benoit, I. Usherov, V.B. Mikhailik, G. Deuter, Josef Jochum, P. de Marcillac, M. Hannewald, F. von Feilitzsch, G. Burghart, E. Olivieri, R. McGowan, H. Kluck, C. Ciemniak, R.B. Podviyanuk, E. J. Daw, V. V. Kobychev, Lionel Torres, A. Chantelauze, H. Kraus, Henri Godfrin, V. Tomasello, I. Bavykina, Max Robinson, J. Imber, S. Roth, R.F. Lang, C. Isaila, S. Henry, C. Pobes, S. Grohmann, V.M. Kudovbenko, G. Drexlin, C. Sailer, F.A. Danevich, E. Armengaud, J. Blümer, S. V. Rozov, V. Kozlov, A. Juillard, G. Gerbier, F. Pröbst, M.-A. Verdier, X. Defay, T.O. Niinikoski, D. Hauff, P. Loaiza, J. Gironnet, D.V. Poda, S. Ingleby, G. Chardin, V.I. Tretyak, S. Scorza, J.-C. Lanfranchi, V. Sanglard, M. De Jesus, L. Dumoulin, Masahiro Teshima, G. Perinic, K. Eitel, N. Coron, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Hélium : du fondamental aux applications (HELFA), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), Cryogénie (Cryo), Institut Rayonnement Matière de Saclay (IRAMIS), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-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), Ultra-basses températures (UBT), Laboratoire Souterrain de Modane (LSM - UMR 6417), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin, EDELWEISS, Hélium : du fondamental aux applications (NEEL - HELFA), 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), Cryogénie (NEEL - Cryo), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), 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), Ultra-basses températures (NEEL - UBT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), HELFA - Hélium : du fondamental aux applications, Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Cryo - Cryogénie, UBT - Ultra-basses températures, and Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, 010308 nuclear & particles physics, Dark matter, General Engineering, Astronomy and Astrophysics, EDELWEISS, 7. Clean energy, 01 natural sciences, Nuclear physics, Multi target, WIMP, Space and Planetary Science, 0103 physical sciences, European Underground Rare Event Calorimeter Array, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics
Abstract

EURECA (European Underground Rare Event Calorimeter Array) is an astro-particle physics facility aiming to directly detect galactic dark matter. The Laboratoire Souterrain de Modane has been selected as host laboratory. The EURECA collaboration unites CRESST, EDELWEISS and the Spanish-French experiment ROSEBUD, thus concentrating and focussing effort on cryogenic detector research in Europe into a single facility. EURECA will use a target mass of up to one ton, enough to explore WIMP - nucleon scalar scattering cross sections in the region of 10-9 - 10-10 picobarn. A major advantage of EURECA is the planned use of more than just one target material (multi target experiment for WIMP identification). © EAS, EDP Sciences 2009.

Full Text
View/download PDF

28. Solar neutrino physics with Borexino

Author

Andrea Pocar, M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, G. Bonfini, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, L. Cappelli, S. Caprioli, M. Carlini, P. Cavalcante, F. Cavanna, A. Chepurnov, K. Choi, L. Collica, D. D’Angelo, S. Davini, A. Derbin, X. F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, K. Fomenko, A. Formozov, D. Franco, F. Gabriele, C. Galbiati, M. Gschwender, C. Ghiano, M. Giammarchi, A. Goretti, M. Gromov, D. Guffanti, T. Houdy, E. Hungerford, Aldo Ianni, Andrea Ianni, A. Jany, D. Jeschke, S. Kumaran, V. Kobychev, G. Korga, T. Lachenmaier, M. Laubenstein, E. Litvinovich, P. Lombardi, L. Ludhova, G. Lukyanchenko, L. Lukyanchenko, I. Machulin, G. Manuzio, S. Marcocci, J. Maricic, J. Martyn, E. Meroni, M. Meyer, L. Miramonti, M. Misiaszek, V. Muratova, B. Neumair, M. Nieslony, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Papp, Ö. Penek, L. Pietrofaccia, N. Pilipenko, A. Porcelli, G. Raikov, G. Ranucci, A. Razeto, A. Re, M. Redchuk, A. Romani, N. Rossi, S. Rottenanger, S. Schönert, D. Semenov, M. Skorokhvatov, O. Smirnov, A. Sotnikov, L. F. F. Stokes, Y. Suvorov , R. Tartaglia, G. Testera, J. Thurn, E. Unzhakov, A. Vishneva, R. B. Vogelaar, F. von Feilitzsch, S. Weinz, M. Wojcik, M. Wurm, O. Zaimidoroga, S. Zavatarelli, K. Zuber, G. Zuzel

Subjects
Physics, QC1-999
Abstract

We present the most recent solar neutrino results from the Borexino experiment at the Gran Sasso underground laboratory. In particular, refined measurements of all neutrinos produced in the {\it pp} fusion chain have been made. It is the first time that the same detector measures the entire range of solar neutrinos at once. These new data weakly favor a high-metallicity Sun. Prospects for measuring CNO solar neutrinos are also discussed.

Published
2019
Full Text
View/download PDF

29. Indication of reactor ν(e) disappearance in the Double Chooz experiment.

Author

Abe Y, Aberle C, Akiri T, dos Anjos JC, Ardellier F, Barbosa AF, Baxter A, Bergevin M, Bernstein A, Bezerra TJ, Bezrukhov L, Blucher E, Bongrand M, Bowden NS, Buck C, Busenitz J, Cabrera A, Caden E, Camilleri L, Carr R, Cerrada M, Chang PJ, Chimenti P, Classen T, Collin AP, Conover E, Conrad JM, Cormon S, Crespo-Anadón JI, Cribier M, Crum K, Cucoanes A, D'Agostino MV, Damon E, Dawson JV, Dazeley S, Dierckxsens M, Dietrich D, Djurcic Z, Dracos M, Durand V, Efremenko Y, Elnimr M, Endo Y, Etenko A, Falk E, Fallot M, Fechner M, von Feilitzsch F, Felde J, Fernandes SM, Franco D, Franke AJ, Franke M, Furuta H, Gama R, Gil-Botella I, Giot L, Göger-Neff M, Gonzalez LF, Goodman MC, Goon JT, Greiner D, Guillon B, Haag N, Hagner C, Hara T, Hartmann FX, Hartnell J, Haruna T, Haser J, Hatzikoutelis A, Hayakawa T, Hofmann M, Horton-Smith GA, Ishitsuka M, Jochum J, Jollet C, Jones CL, Kaether F, Kalousis L, Kamyshkov Y, Kaplan DM, Kawasaki T, Keefer G, Kemp E, de Kerret H, Kibe Y, Konno T, Kryn D, Kuze M, Lachenmaier T, Lane CE, Langbrandtner C, Lasserre T, Letourneau A, Lhuillier D, Lima HP Jr, Lindner M, Liu Y, López-Castanõ JM, LoSecco JM, Lubsandorzhiev BK, Lucht S, McKee D, Maeda J, Maesano CN, Mariani C, Maricic J, Martino J, Matsubara T, Mention G, Meregaglia A, Miletic T, Milincic R, Milzstajn A, Miyata H, Motta D, Mueller TA, Nagasaka Y, Nakajima K, Novella P, Obolensky M, Oberauer L, Onillon A, Osborn A, Ostrovskiy I, Palomares C, Peeters SJ, Pepe IM, Perasso S, Perrin P, Pfahler P, Porta A, Potzel W, Queval R, Reichenbacher J, Reinhold B, Remoto A, Reyna D, Röhling M, Roth S, Rubin HA, Sakamoto Y, Santorelli R, Sato F, Schönert S, Schoppmann S, Schwan U, Schwetz T, Shaevitz MH, Shrestha D, Sida JL, Sinev V, Skorokhvatov M, Smith E, Spitz J, Stahl A, Stancu I, Strait M, Stüken A, Suekane F, Sukhotin S, Sumiyoshi T, Sun Y, Sun Z, Svoboda R, Tabata H, Tamura N, Terao K, Tonazzo A, Toups M, Trinh Thi HH, Veyssiere C, Wagner S, Watanabe H, White B, Wiebusch C, Winslow L, Worcester M, Wurm M, Yanovitch E, Yermia F, Zbiri K, and Zimmer V

Abstract

The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio of events of 0.944±0.016(stat)±0.040(syst) was obtained in 101 days of running at the Chooz nuclear power plant in France, with two 4.25 GW(th) reactors. The results were obtained from a single 10 m(3) fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 flux measurement after correction for differences in core composition. The deficit can be interpreted as an indication of a nonzero value of the still unmeasured neutrino mixing parameter sin(2)2θ(13). Analyzing both the rate of the prompt positrons and their energy spectrum, we find sin(2)2θ(13)=0.086±0.041(stat)±0.030(syst), or, at 90% C.L., 0.017

Published
2012
Full Text
View/download PDF

30. Optical scattering lengths in large liquid-scintillator neutrino detectors.

Author

Wurm M, von Feilitzsch F, Göger-Neff M, Hofmann M, Lachenmaier T, Lewke T, Marrodán Undagoitia T, Meindl Q, Möllenberg R, Oberauer L, Potzel W, Tippmann M, Todor S, Traunsteiner C, and Winter J

Abstract

For liquid-scintillator neutrino detectors of kiloton scale, the transparency of the organic solvent is of central importance. The present paper reports on laboratory measurements of the optical scattering lengths of the organic solvents phenylxylylethane, linear alkylbenzene (LAB), and dodecane, which are under discussion for next-generation experiments such as SNO+ (Sudbury Neutrino Observatory), HanoHano, or LENA (Low Energy Neutrino Astronomy). Results comprise the wavelength range of 415-440 nm. The contributions from Rayleigh and Mie scattering as well as from absorption/re-emission processes are discussed. Based on the present results, LAB seems to be the preferred solvent for a large-volume detector.

Published
2010
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results