Search of Neutrinoless Double Beta Decay with the GERDA Experiment

Agostini, M.; Allardt, M.; Bakalyarov, A. M.; Balata, M.; Barabanov, I.; Baudis, L.; Bauer, C.; Becerici Schmidt, N.; Bellotti, E.; Belogurov, S.; Belyaev, S. T.; Benato, G; Bettini, Alessandro; Bezrukov, L.; Bode, T.; Borowicz, D.; Brudanin, V.; Brugnera, Riccardo; Budjáš, D.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; D'Andrea, V.; Demidova, E. V.; Domula, A.; Doroshkevich, E.; Egorov, V.; Falkenstein, R.; Fedorova, O.; Freund, K.; Frodyma, N.; Gangapshev, A.; Garfagnini, Alberto; Gooch, C.; Gotti, C.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hampel, W.; Hegai, A.; Heisel, M.; Hemmer, SABINE ELISABETH; Heusser, G.; Hoffmann, W.; Hult, M.; Inzhechik, L. V.; Ioannucci, L.; Janicksó Csáthy, J.; Jochum, J.; Junker, M.; Kazalov, V.; Kihm, T.; Kirpichnikov, I. V.; Kirsch, A.; Klimenko, A.; Knöpfle, K. T.; Kochetov, O.; Kornoukhov, V. N.; Kuzminov, V. V.; Laubenstein, M.; Lazzaro, A.; Lebedev, V. I.; Lehnert, B.; Liao, H. Y.; Lindner, M.; Lippi, Ivano; Lubashevskiy, A.; Lubsandorzhiev, B.; Lutter, G.; Macolino, C.; Majorovits, B.; Maneschg, W.; Marissens, G.; MEDINACELI VILLEGAS, Eduardo; Misiaszek, M.; Moseev, P.; Nemchenok, I.; Nisi, S.; Palioselitis, D.; Panas, K.; Pandola, L.; Pelczar, K.; Pessina, G.; Pullia, A.; Reissfelder, M.; Riboldi, S.; Rumyantseva, N.; Sada, Cinzia; Salathe, M.; Schmitt, C.; Schneider, B.; Schreiner, J.; Schulz, O.; Schwingenheuer, B.; Schönert, S.; Seitz, H.; Selivalenko, O.; Shevchik, E.; Shirchenko, M.; Simgen, H.; Smolnikov, A.; Stanco, Luca; Stepaniuk, M.; Strecker, H.; Ur, CALIN ALEXANDRU; Vanhoefer, L.; Vasenko, A. A.; Veresnikova, A.; VON STURM ZU VEHLINGEN, KATHARINA CACILIE; Wagner, V.; Walter, M.; Wegmann, A.; Wester, T.; Wiesinger, C.; Wilsenach, H.; Wojcik, M.; Yanovich, E.; Zavarise, P.; Zhitnikov, I.; Zhukov, S. V.; Zinatulina, D.; Zuber, K.; Zuzel, G.

doi:10.1016/j.nuclphysbps.2015.09.303

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The GERDA (GERmanium Detector Array) is an experiment for the search of neutrinoless double beta decay (0 nu beta beta) in Ge-76, 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 nu beta beta 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 . 10(25) yr (90% C.L.) was established. Correspondingly, the limit on the effective Majorana neutrino mass is m(ee) < 0.2-0.4 eV, depending on the considered nuclear matrix element. The previous claim for evidence of a 0 nu beta beta decay signal is strongly disfavored, and the field of research is open again.

Titolo:	Search of Neutrinoless Double Beta Decay with the GERDA Experiment
Autori:	Agostini, M. Allardt, M. Bakalyarov, A. M. Balata, M. Barabanov, I. Baudis, L. Bauer, C. Becerici Schmidt, N. Bellotti, E. Belogurov, S. Belyaev, S. T. Benato, G BETTINI, ALESSANDRO Bezrukov, L. Bode, T. Borowicz, D. Brudanin, V. BRUGNERA, RICCARDO Budjáš, D. Caldwell, A. Cattadori, C. Chernogorov, A. D'Andrea, V. Demidova, E. V. Domula, A. Doroshkevich, E. Egorov, V. Falkenstein, R. Fedorova, O. Freund, K. Frodyma, N. Gangapshev, A. GARFAGNINI, ALBERTO Gooch, C. Gotti, C. Grabmayr, P. Gurentsov, V. Gusev, K. Hampel, W. Hegai, A. Heisel, M. HEMMER, SABINE ELISABETH Heusser, G. Hoffmann, W. Hult, M. Inzhechik, L. V. Ioannucci, L. Janicksó Csáthy, J. Jochum, J. Junker, M. Kazalov, V. Kihm, T. Kirpichnikov, I. V. Kirsch, A. Klimenko, A. Knöpfle, K. T. Kochetov, O. Kornoukhov, V. N. Kuzminov, V. V. Laubenstein, M. Lazzaro, A. Lebedev, V. I. Lehnert, B. Liao, H. Y. Lindner, M. LIPPI, IVANO Lubashevskiy, A. Lubsandorzhiev, B. Lutter, G. Macolino, C. Majorovits, B. Maneschg, W. Marissens, G. MEDINACELI VILLEGAS, EDUARDO Misiaszek, M. Moseev, P. Nemchenok, I. Nisi, S. Palioselitis, D. Panas, K. Pandola, L. Pelczar, K. Pessina, G. Pullia, A. Reissfelder, M. Riboldi, S. Rumyantseva, N. SADA, CINZIA Salathe, M. Schmitt, C. Schneider, B. Schreiner, J. Schulz, O. Schwingenheuer, B. Schönert, S. Seitz, H. Selivalenko, O. Shevchik, E. Shirchenko, M. Simgen, H. Smolnikov, A. STANCO, LUCA Stepaniuk, M. Strecker, H. UR, CALIN ALEXANDRU Vanhoefer, L. Vasenko, A. A. Veresnikova, A. VON STURM ZU VEHLINGEN, KATHARINA CACILIE Wagner, V. Walter, M. Wegmann, A. Wester, T. Wiesinger, C. Wilsenach, H. Wojcik, M. Yanovich, E. Zavarise, P. Zhitnikov, I. Zhukov, S. V. Zinatulina, D. Zuber, K. Zuzel, G. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2016
Abstract:	The GERDA (GERmanium Detector Array) is an experiment for the search of neutrinoless double beta decay (0 nu beta beta) in Ge-76, 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 nu beta beta 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 . 10(25) yr (90% C.L.) was established. Correspondingly, the limit on the effective Majorana neutrino mass is m(ee) < 0.2-0.4 eV, depending on the considered nuclear matrix element. The previous claim for evidence of a 0 nu beta beta decay signal is strongly disfavored, and the field of research is open again.
Handle:	http://hdl.handle.net/11577/3221738
Appare nelle tipologie:	02.01 - Contributo in volume (Capitolo o Saggio)

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