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27 April 2024

» arxiv » 1501.2345

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Results on $etaeta$ decay with emission of two neutrinos or Majorons in $^{76}$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. Janicskó 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 ; J. Schreiner ; O. Schulz ; B. Schwingenheuer ; S. Schönert ; 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 ;
Date:	10 Jan 2015
Abstract:	A search for neutrinoless $etaeta$ 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$^{23}$ yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with $^{76}$Ge. A new result for the half-life of the neutrino-accompanied $etaeta$ decay of $^{76}$Ge with significantly reduced uncertainties is also given, resulting in $T^{2 u}_{1/2} = (1.926 pm 0.095)cdot10^{21}$ yr.
Source:	arXiv, 1501.2345
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