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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;
  • Salathe, M;
  • Schmitt, C;
  • Schneider, B;
  • Schönert, S;
  • Schreiner, J;
  • Schütz, AK;
  • Schulz, O;
  • Schwingenheuer, B;
  • Selivanenko, O;
  • Shirchenko, M;
  • Simgen, H;
  • Smolnikov, A;
  • Stanco, L;
  • Stepaniuk, M;
  • Ur, CA;
  • Vanhoefer, L;
  • Vasenko, AA
  • et al.
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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