Measurement of the half-life of the two-neutrino double beta decay of Ge-76 with the Gerda experiment

M Agostini,R Brugnera,L B Bezrukov,M Tarka,M Allardt,A Chernogorov,V Egorov, S Hemmer,K Freund, F Ritter,A D Ferella,K Gusev, D Budja S,V N Kornoukhov,G Zuzel,H Y Liao,F Froborg,L Stanco, S Kianovsky,H Strecker,S Schonert,L Baudis,H Simgen,A Smolnikov,E Andreotti,C Sada,W Hofmann, K Pelczar,A Domula,A M Gangapshev,O Kochetov,V Gurentsov,I Lippi,A Garfagnini,K K Guthikonda,F Cossavella,A Lubashevskiy, P Zavarise, N Frodyma,C A Ur,M Barnabe Heider,K T Knopfle, S Gazzana,O Volynets,J Jochum,J Janicsko Csathy,M Junker,S Belogurov,W Hampel,M Wojcik,S Riboldi,L V Inzhechik, A S Caldwell,A Wegmann,I Nemchenok,I Zhitnikov, M Balata,N Becericischmidt,A Bettini,E Shevchik,J Schreiner,K Zuber,S V Zhukov,O Schulz,A M Bakalyarov,A Lazzaro,V Kusminov, A A Machado,I V Kirpichnikov, Michael G Walter,P Grabmayr,G Lutter,I R Barabanov,C Cattadori,M Laubenstein,B Schwingenheuer,C Schmitt,D Zinatulina,L Pandola,A Pullia,N Barros,A Denisov,E Bellotti,A Kirsch, L Peraro,B Majorovits,A A Vasenko, M Shirchenko,V B Brudanin,E V Demidova,Xiang Liu,B Lehnert,G Benato,B K Lubsandorzhiev,E Yanovich,S T Belyaev,G Heusser,C Bauer,V I Lebedev, W Maneschg,M Lindner,C Oshaughnessy,M Hult,T Bode,K Von Sturm, M Heisel,A Hegai,R Falkenstein, L Ioannucci,S Nisi,A A Klimenko,M Salathe

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS（2013）

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摘要

The primary goal of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN is the search for the neutrinoless double beta decay of Ge-76. High-purity germanium detectors made from material enriched in Ge-76 are operated directly immersed in liquid argon, allowing for a substantial reduction of the background with respect to predecessor experiments. The first 5.04 kg yr of data collected in Phase I of the experiment have been analyzed to measure the half-life of the neutrino-accompanied double beta decay of Ge-76. The observed spectrum in the energy range between 600 and 1800 keV is dominated by the double beta decay of Ge-76. The half-life extracted from GERDA data is T-1/2(2 nu) = (1.84(-0.10)(+0.14)) x 10(21) yr.

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germanium detector

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