Final Results of GERDA on the Two-Neutrino Double-β Decay Half-Life of ^{76}Ge.
M Agostini,A Alexander,G R Araujo,A M Bakalyarov,M Balata,I Barabanov,L Baudis,C Bauer,S Belogurov,A Bettini,L Bezrukov,V Biancacci,E Bossio,V Bothe,R Brugnera,A Caldwell,S Calgaro,C Cattadori,A Chernogorov,P-J Chiu,T Comellato,V D'Andrea,E V Demidova,A Di Giacinto,N Di Marco,E Doroshkevich,F Fischer,M Fomina,A Gangapshev,A Garfagnini,C Gooch,P Grabmayr,V Gurentsov,K Gusev,S Hackenmüller,S Hemmer,W Hofmann,J Huang,M Hult,L V Inzhechik,J Janicskó Csáthy,J Jochum,M Junker,V Kazalov,Y Kermaïdic,H Khushbakht,T Kihm,K Kilgus,I V Kirpichnikov,A Klimenko,K T Knöpfle,O Kochetov,V N Kornoukhov,P Krause,V V Kuzminov,M Laubenstein,B Lehnert,M Lindner,I Lippi,A Lubashevskiy,B Lubsandorzhiev,G Lutter,C Macolino,B Majorovits,W Maneschg,L Manzanillas,G Marshall,M Miloradovic,R Mingazheva,M Misiaszek,M Morella,Y Müller,I Nemchenok,M Neuberger,L Pandola,K Pelczar,L Pertoldi,P Piseri,A Pullia,C Ransom,L Rauscher,M Redchuk,S Riboldi,N Rumyantseva,C Sada,S Sailer,F Salamida,S Schönert,J Schreiner,M Schütt,A-K Schütz,O Schulz,M Schwarz,B Schwingenheuer,O Selivanenko,E Shevchik,M Shirchenko,L Shtembari,H Simgen,A Smolnikov,D Stukov,S Sullivan,A A Vasenko,A Veresnikova,C Vignoli,K von Sturm,T Wester,C Wiesinger,M Wojcik,E Yanovich,B Zatschler,I Zhitnikov,S V Zhukov,D Zinatulina,A Zschocke,A J Zsigmond,K Zuber,G Zuzel
Physical review letters（2023）
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摘要
We present the measurement of the two-neutrino double-β decay rate of ^{76}Ge performed with the GERDA Phase II experiment. With a subset of the entire GERDA exposure, 11.8 kg yr, the half-life of the process has been determined: T_{1/2}^{2ν}=(2.022±0.018_{stat}±0.038_{syst})×10^{21} yr. This is the most precise determination of the ^{76}Ge two-neutrino double-β decay half-life and one of the most precise measurements of a double-β decay process. The relevant nuclear matrix element can be extracted: M_{eff}^{2ν}=(0.101±0.001).
