Limit On Neutrinoless Double Beta Decay Of Ge-76 By Gerda

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

13TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS, TAUP 2013（2015）

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摘要

The Gerda experiment at the Laboratori Nazionali del Gran Sasso in Italy uses germanium detectors made from material with an enriched Ge-76 isotope fraction to search for neutrinoless double beta decay of this nucleus. Applying a blind analysis we find no signal after an exposure of 21.6 kg.yr and a background of about 0.01 cts/(keV.kg.yr). A half-life limit of T-1/20(v) > 2.1 . 10(25) yr (90% C.L.) is extracted. The previous claim of a signal for Ge-76 is excluded with 99% probability in a model independent way. (C) 2015 The Authors. Published by Elsevier B.V.

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double beta decay

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