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. 2023 Oct 6;131(14):142501.
doi: 10.1103/PhysRevLett.131.142501.

Final Results of GERDA on the Two-Neutrino Double-β Decay Half-Life of ^{76}Ge

M Agostini  1 A Alexander  1 G R Araujo  2 A M Bakalyarov  3 M Balata  4 I Barabanov  5 L Baudis  2 C Bauer  6 S Belogurov  5   7 A Bettini  8   9 L Bezrukov  5 V Biancacci  8   9 E Bossio  10 V Bothe  6 R Brugnera  8   9 A Caldwell  11 S Calgaro  8   9 C Cattadori  12 A Chernogorov  7   3 P-J Chiu  2 T Comellato  10 V D'Andrea  13 E V Demidova  7 A Di Giacinto  4 N Di Marco  14 E Doroshkevich  5 F Fischer  11 M Fomina  15 A Gangapshev  6   5 A Garfagnini  8   9 C Gooch  11 P Grabmayr  16 V Gurentsov  5 K Gusev  15   3   10 S Hackenmüller  6 S Hemmer  9 W Hofmann  6 J Huang  2 M Hult  17 L V Inzhechik  5 J Janicskó Csáthy  10 J Jochum  16 M Junker  4 V Kazalov  5 Y Kermaïdic  6 H Khushbakht  16 T Kihm  6 K Kilgus  16 I V Kirpichnikov  7 A Klimenko  15   6 K T Knöpfle  6 O Kochetov  15 V N Kornoukhov  5 P Krause  10 V V Kuzminov  5 M Laubenstein  4 B Lehnert  18 M Lindner  6 I Lippi  9 A Lubashevskiy  15 B Lubsandorzhiev  5 G Lutter  17 C Macolino  13 B Majorovits  11 W Maneschg  6 L Manzanillas  11 G Marshall  1 M Miloradovic  2 R Mingazheva  2 M Misiaszek  19 M Morella  14 Y Müller  2 I Nemchenok  15 M Neuberger  10 L Pandola  20 K Pelczar  17 L Pertoldi  10   9 P Piseri  21 A Pullia  21 C Ransom  2 L Rauscher  16 M Redchuk  9 S Riboldi  21 N Rumyantseva  15   3 C Sada  8   9 S Sailer  6 F Salamida  13 S Schönert  10 J Schreiner  6 M Schütt  6 A-K Schütz  16 O Schulz  11 M Schwarz  10 B Schwingenheuer  6 O Selivanenko  5 E Shevchik  15 M Shirchenko  15 L Shtembari  11 H Simgen  6 A Smolnikov  15   6 D Stukov  3 S Sullivan  6 A A Vasenko  7 A Veresnikova  5 C Vignoli  4 K von Sturm  8   9 T Wester  18 C Wiesinger  10 M Wojcik  19 E Yanovich  5 B Zatschler  18 I Zhitnikov  15 S V Zhukov  3 D Zinatulina  15 A Zschocke  16 A J Zsigmond  11 K Zuber  18 G Zuzel  19 GERDA Collaboration
Affiliations

Final Results of GERDA on the Two-Neutrino Double-β Decay Half-Life of ^{76}Ge

M Agostini et al. Phys Rev Lett. .

Abstract

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).

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