Results on neutrinoless double beta decay of 76Ge from GERDA Phase I
Abstract
Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the Standard Model of particle physics. This Letter reports the results from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope 76Ge. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kgyr. A blind analysis is performed. The background index is about 1.10^{-2} cts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of 76Ge, T_1/2 > 2.1 10^{25} yr (90% C.L.). The combination with the results from the previous experiments with 76Ge yields T_1/2 > 3.0 10^{25} yr (90% C.L.).
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Cite
@article{arxiv.1307.4720,
title = {Results on neutrinoless double beta decay of 76Ge from GERDA Phase I},
author = {M. Agostini and M. Allardt and E. Andreotti and A. M. Bakalyarov and M. Balata and I. Barabanov and M. Barnabé Heider and N. Barros and L. Baudis and C. Bauer and N. Becerici-Schmidt and E. Bellotti and S. Belogurov and S. T. Belyaev and G. Benato and A. Bettini and L. Bezrukov and T. Bode and V. Brudanin and R. Brugnera and D. Budjáš and A. Caldwell and C. Cattadori and A. Chernogorov and F. Cossavella and E. V. Demidova and A. Domula and V. Egorov and R. Falkenstein and A. Ferella and K. Freund and N. Frodyma and A. Gangapshev and A. Garfagnini and C. Gotti and P. Grabmayr and V. Gurentsov and K. Gusev and K. K. Guthikonda and W. Hampel and A. Hegai and M. Heisel and S. Hemmer and G. Heusser and W. Hofmann and M. Hult and L. V. Inzhechik and L. Ioannucci and J. Janicskó Csáthy and J. Jochum and M. Junker and T. Kihm and I. V. Kirpichnikov and A. Kirsch and A. Klimenko and K. T. Knöpfle and O. Kochetov and V. N. Kornoukhov and V. V. Kuzminov and M. Laubenstein and A. Lazzaro and V. I. Lebedev and B. Lehnert and H. Y. Liao and M. Lindner and I. Lippi and X. Liu and A. Lubashevskiy and B. Lubsandorzhiev and G. Lutter and C. Macolino and A. A. Machado and B. Majorovits and W. Maneschg and M. Misiaszek and I. Nemchenok and S. Nisi and C. O'Shaughnessy and L. Pandola and K. Pelczar and G. Pessina and %F. Potenza and A. Pullia and S. Riboldi and N. Rumyantseva and C. Sada and M. Salathe and C. Schmitt and J. Schreiner and O. Schulz and B. Schwingenheuer and S. Schönert and E. Shevchik and M. Shirchenko and H. Simgen and A. Smolnikov and L. Stanco and H. Strecker and M. Tarka and C. A. Ur and A. A. Vasenko and O. Volynets and K. von Sturm and V. Wagner and M. Walter and A. Wegmann and T. Wester and M. Wojcik and E. Yanovich and P. Zavarise and I. Zhitnikov and S. V. Zhukov and D. Zinatulina and K. Zuber and G. Zuzel},
journal= {arXiv preprint arXiv:1307.4720},
year = {2013}
}
Comments
6 pages, 2 figures