1. Search of Neutrinoless Double Beta Decay with the GERDA Experiment
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Alessandro Bettini, P. Moseev, Allen Caldwell, Luciano Pandola, L. Ioannucci, K. N. Gusev, A. Kirsch, A. A. Klimenko, V. I. Gurentsov, Stefan Schönert, N. Rumyantseva, M. Heisel, D. Palioselitis, A. Lazzaro, Laura Baudis, Gerd Marissens, H. Y. Liao, J. Jochum, Bayarto Lubsandorzhiev, L. V. Inzhechik, V. V. Kazalov, K. von Sturm, O.I. Kochetov, T. Wester, Claudio Gotti, A.A. Smolnikov, S. T. Belyaev, M. Junker, N. Becerici-Schmidt, G. Heusser, A. M. Gangapshev, H. Wilsenach, C. A. Ur, W. Hoffmann, I. Zhitnikov, C. Cattadori, Kai Zuber, H. Seitz, A. Wegmann, Marcin Wójcik, Manfred Lindner, Igor Nemchenok, M. Stepaniuk, C. Macolino, E. Doroshkevich, O. Selivalenko, V. I. Lebedev, P. Grabmayr, Bela Majorovits, M. Walter, H. Strecker, M. Allardt, Oliver Schulz, J. Janicksó Csáthy, M. Balata, Alberto Pullia, W. Hampel, E. V. Demidova, I. V. Kirpichnikov, K. Freund, O. Fedorova, A. Garfagnini, M. Shirchenko, L. Vanhoefer, B. Schwingenheuer, A. Hegai, E. Medinaceli, T. Bode, I. R. Barabanov, W. Maneschg, Cinzia Sada, Matthias Laubenstein, S. V. Zhukov, P. Zavarise, E. A. Yanovich, Stefano Nisi, S. Belogurov, M. Salathe, Christian Bauer, K. Panas, V. Wagner, N. Frodyma, Luca Stanco, V. D'Andrea, V. N. Kornoukhov, K. Pelczar, Giovanni Benato, A. Lubashevskiy, A. A. Vasenko, M. Reissfelder, V. Egorov, K. T. Knöpfle, Guillaume Lutter, A. M. Bakalyarov, R. Brugnera, V. V. Kuzminov, Matteo Agostini, G. Zuzel, R. Falkenstein, C. Gooch, Ivano Lippi, A. V. Veresnikova, C. Schmitt, A. Domula, A. Chernogorov, Stefano Riboldi, V.B. Brudanin, Hardy Simgen, M. Misiaszek, D. Borowicz, B. Lehnert, L. B. Bezrukov, E. Shevchik, G. Pessina, D. Budjáš, E. Bellotti, Thomas Kihm, D. R. Zinatulina, Mikael Hult, S. Hemmer, J. Schreiner, B. Schneider, and C. Wiesinger
- Subjects
Semileptonic decay ,Particle physics ,Nuclear and High Energy Physics ,enriched Ge ,enriched Ge detectors ,chemistry.chemical_element ,Germanium ,01 natural sciences ,76Ge ,Lower limit ,neutrinoless double beta decay ,Nuclear physics ,T-1/2(0 nu) ,Double beta decay ,0103 physical sciences ,010306 general physics ,detectors ,Physics ,Ge-76 ,T1/20ν ,Enriched Ge detectors ,Neutrinoless double beta decay ,010308 nuclear & particles physics ,Semiconductor detector ,MAJORANA ,chemistry ,Neutrino - Abstract
The GERDA (GERmanium Detector Array) is an experiment for the search of neutrinoless double beta decay ( 0 ν β β ) in 76Ge, located at Laboratori Nazionali del Gran Sasso of INFN (Italy). In the first phase of the experiment, a 90% confidence level (C.L.) sensitivity of 2.4 ⋅ 10 25 yr on the 0 ν β β decay half-life was achieved with a 21.6 kg⋅yr exposure and an unprecedented background index in the region of interest of 10−2 counts/(keV⋅kg⋅yr). No excess of signal events was found, and an experimental lower limit on the half-life of 2.1 ⋅ 1025 yr (90% C.L.) was established. Correspondingly, the limit on the effective Majorana neutrino mass is m e e 0.2 – 0.4 eV , depending on the considered nuclear matrix element. The previous claim for evidence of a 0 ν β β decay signal is strongly disfavored, and the field of research is open again.
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