Two neutrino double beta decay of 76Ge to excited states of 76Se has been studied using data from Phase I of the GERDA experiment. An array composed of up to 14 germanium detectors including detectors that have been isotopically enriched in 76Ge was deployed in liquid argon. The analysis of various possible transitions to excited final states is based on coincidence events between pairs of detectors where a de-excitation γ ray is detected in one detector and the two electrons in the other. No signal has been observed and an event counting profile likelihood analysis has been used to determine Frequentist 90% C.L. bounds for three transitions: 0+g.s. - 21+: T1 2 2n> 1.6 1023 yr, 0+g.s. - 01+: T1 2 2n> 3.7 1023 yr and 0 2 : g.s. - 2 + + T1 2 2n> 2.3 1023 yr. These bounds are more than two orders of magnitude larger than those reported previously. Bayesian 90% credibility bounds were extracted and used to exclude several models for the 0+g.s. - 01+ transition.
2νββ decay of 76Ge into excited states with GERDA phase i / M. Agostini, M. Allardt, A.M. Bakalyarov, M. Balata, I. Barabanov, N. Barros, L. Baudis, C. Bauer, N. Becerici Schmidt, E. Bellotti, S. Belogurov, S.T. Belyaev, G. Benato, A. Bettini, L. Bezrukov, T. Bode, D. Borowicz, V. Brudanin, R. Brugnera, D. Budjáš, A. Caldwell, C. Cattadori, A. Chernogorov, V. D'Andrea, E.V. Demidova, A.D. Vacri, A. Domula, E. Doroshkevich, V. Egorov, R. Falkenstein, O. Fedorova, K. Freund, N. Frodyma, A. Gangapshev, A. Garfagnini, C. Gooch, P. Grabmayr, V. Gurentsov, K. Gusev, A. Hegai, M. Heisel, S. Hemmer, G. Heusser, W. Hofmann, M. Hult, L.V. Inzhechik, J.J. Csáthy, J. Jochum, M. Junker, V. Kazalov, T. Kihm, I.V. Kirpichnikov, A. Kirsch, A. Klimenko, K.T. Knöpfle, O. Kochetov, V.N. Kornoukhov, V.V. Kuzminov, M. Laubenstein, A. Lazzaro, V.I. Lebedev, B. Lehnert, H.Y. Liao, M. Lindner, I. Lippi, A. Lubashevskiy, B. Lubsandorzhiev, G. Lutter, C. Macolino, B. Majorovits, W. Maneschg, E. Medinaceli, Y. Mi, M. Misiaszek, P. Moseev, I. Nemchenok, D. Palioselitis, K. Panas, L. Pandola, K. Pelczar, A. Pullia, S. Riboldi, N. Rumyantseva, C. Sada, M. Salathe, C. Schmitt, B. Schneider, J. Schreiner, O. Schulz, B. Schwingenheuer, S. Schönert, A. Schütz, O. Selivanenko, M. Shirchenko, H. Simgen, A. Smolnikov, L. Stanco, M. Stepaniuk, C.A. Ur, L. Vanhoefer, A.A. Vasenko, A. Veresnikova, K.V. Sturm, V. Wagner, M. Walter, A. Wegmann, T. Wester, H. Wilsenach, M. Wojcik, E. Yanovich, P. Zavarise, I. Zhitnikov, S.V. Zhukov, D. Zinatulina, K. Zuber, G. Zuzel. - In: JOURNAL OF PHYSICS. G, NUCLEAR AND PARTICLE PHYSICS. - ISSN 0954-3899. - 42:11(2015 Nov), pp. 115201.1-115201.19. [10.1088/0954-3899/42/11/115201]
2νββ decay of 76Ge into excited states with GERDA phase i
A. Pullia;S. Riboldi;
2015
Abstract
Two neutrino double beta decay of 76Ge to excited states of 76Se has been studied using data from Phase I of the GERDA experiment. An array composed of up to 14 germanium detectors including detectors that have been isotopically enriched in 76Ge was deployed in liquid argon. The analysis of various possible transitions to excited final states is based on coincidence events between pairs of detectors where a de-excitation γ ray is detected in one detector and the two electrons in the other. No signal has been observed and an event counting profile likelihood analysis has been used to determine Frequentist 90% C.L. bounds for three transitions: 0+g.s. - 21+: T1 2 2n> 1.6 1023 yr, 0+g.s. - 01+: T1 2 2n> 3.7 1023 yr and 0 2 : g.s. - 2 + + T1 2 2n> 2.3 1023 yr. These bounds are more than two orders of magnitude larger than those reported previously. Bayesian 90% credibility bounds were extracted and used to exclude several models for the 0+g.s. - 01+ transition.
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