A search for neutrinoless ββ decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10<sup>23</sup> yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with <sup>76</sup>Ge. A new result for the half-life of the neutrino-accompanied ββ decay of <sup>76</sup>Ge with significantly reduced uncertainties is also given, resulting in (Formula presented.) yr.
Results on ββ decay with emission of two neutrinos or Majorons in <sup>76</sup>Ge from 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. di Vacri, A. Domula, E. Doroshkevich, V. Egorov, R. Falkenstein, O. Fedorova, K. Freund, N. Frodyma, A. Gangapshev, A. Garfagnini, 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, 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, S. Schönert, J. Schreiner, A.-. Schütz, O. Schulz, B. Schwingenheuer, O. Selivanenko, M. Shirchenko, H. Simgen, A. Smolnikov, L. Stanco, M. Stepaniuk, C.A. Ur, L. Vanhoefer, A.A. Vasenko, A. Veresnikova, K. von 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: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 75:9(2015 Sep 09), pp. 416.1-416.12. [10.1140/epjc/s10052-015-3627-y]
Results on ββ decay with emission of two neutrinos or Majorons in 76Ge from GERDA Phase I
A. Pullia;S. Riboldi;
2015
Abstract
A search for neutrinoless ββ decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 1023 yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with 76Ge. A new result for the half-life of the neutrino-accompanied ββ decay of 76Ge with significantly reduced uncertainties is also given, resulting in (Formula presented.) yr.
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