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Results on ββ decay with emission of two neutrinos or Majorons in 76Ge from GERDA Phase I: GERDA Collaboration

  • Author(s): GERDA Collaboration
  • Agostini, M
  • Allardt, M
  • Bakalyarov, AM
  • Balata, M
  • Barabanov, I
  • Barros, N
  • Baudis, L
  • Bauer, C
  • Becerici-Schmidt, N
  • Bellotti, E
  • Belogurov, S
  • Belyaev, ST
  • Benato, G
  • Bettini, A
  • Bezrukov, L
  • Bode, T
  • Borowicz, D
  • Brudanin, V
  • Brugnera, R
  • Budjáš, D
  • Caldwell, A
  • Cattadori, C
  • Chernogorov, A
  • D’Andrea, V
  • Demidova, EV
  • di Vacri, A
  • Domula, A
  • Doroshkevich, E
  • Egorov, V
  • Falkenstein, R
  • Fedorova, O
  • Freund, K
  • Frodyma, N
  • Gangapshev, A
  • Garfagnini, A
  • Grabmayr, P
  • Gurentsov, V
  • Gusev, K
  • Hegai, A
  • Heisel, M
  • Hemmer, S
  • Heusser, G
  • Hofmann, W
  • Hult, M
  • Inzhechik, LV
  • Csáthy, JJ
  • Jochum, J
  • Junker, M
  • Kazalov, V
  • Kihm, T
  • Kirpichnikov, IV
  • Kirsch, A
  • Klimenko, A
  • Knöpfle, KT
  • Kochetov, O
  • Kornoukhov, VN
  • Kuzminov, VV
  • Laubenstein, M
  • Lazzaro, A
  • Lebedev, VI
  • Lehnert, B
  • Liao, HY
  • Lindner, M
  • Lippi, I
  • Lubashevskiy, A
  • Lubsandorzhiev, B
  • Lutter, G
  • Macolino, C
  • Majorovits, B
  • Maneschg, W
  • Medinaceli, E
  • Misiaszek, M
  • Moseev, P
  • Nemchenok, I
  • Palioselitis, D
  • Panas, K
  • Pandola, L
  • Pelczar, K
  • Pullia, A
  • Riboldi, S
  • Rumyantseva, N
  • Sada, C
  • et al.
Abstract

© 2015, The Author(s). 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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