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; GERDA Collaboration

doi:10.1103/PhysRevLett.131.142501

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

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

Authors

M Agostini¹, A Alexander¹, G R Araujo², A M Bakalyarov³, M Balata⁴, I Barabanov⁵, L Baudis², C Bauer⁶, S Belogurov^{5

7}, A Bettini^{8

9}, L Bezrukov⁵, V Biancacci^{8

9}, E Bossio¹⁰, V Bothe⁶, R Brugnera^{8

9}, A Caldwell¹¹, S Calgaro^{8

9}, C Cattadori¹², A Chernogorov^{7

3}, P-J Chiu², T Comellato¹⁰, V D'Andrea¹³, E V Demidova⁷, A Di Giacinto⁴, N Di Marco¹⁴, E Doroshkevich⁵, F Fischer¹¹, M Fomina¹⁵, A Gangapshev^{6

5}, A Garfagnini^{8

9}, C Gooch¹¹, P Grabmayr¹⁶, V Gurentsov⁵, K Gusev^{15

3

10}, S Hackenmüller⁶, S Hemmer⁹, W Hofmann⁶, J Huang², M Hult¹⁷, L V Inzhechik⁵, J Janicskó Csáthy¹⁰, J Jochum¹⁶, M Junker⁴, V Kazalov⁵, Y Kermaïdic⁶, H Khushbakht¹⁶, T Kihm⁶, K Kilgus¹⁶, I V Kirpichnikov⁷, A Klimenko^{15

6}, K T Knöpfle⁶, O Kochetov¹⁵, V N Kornoukhov⁵, P Krause¹⁰, V V Kuzminov⁵, M Laubenstein⁴, B Lehnert¹⁸, M Lindner⁶, I Lippi⁹, A Lubashevskiy¹⁵, B Lubsandorzhiev⁵, G Lutter¹⁷, C Macolino¹³, B Majorovits¹¹, W Maneschg⁶, L Manzanillas¹¹, G Marshall¹, M Miloradovic², R Mingazheva², M Misiaszek¹⁹, M Morella¹⁴, Y Müller², I Nemchenok¹⁵, M Neuberger¹⁰, L Pandola²⁰, K Pelczar¹⁷, L Pertoldi^{10

9}, P Piseri²¹, A Pullia²¹, C Ransom², L Rauscher¹⁶, M Redchuk⁹, S Riboldi²¹, N Rumyantseva^{15

3}, C Sada^{8

9}, S Sailer⁶, F Salamida¹³, S Schönert¹⁰, J Schreiner⁶, M Schütt⁶, A-K Schütz¹⁶, O Schulz¹¹, M Schwarz¹⁰, B Schwingenheuer⁶, O Selivanenko⁵, E Shevchik¹⁵, M Shirchenko¹⁵, L Shtembari¹¹, H Simgen⁶, A Smolnikov^{15

6}, D Stukov³, S Sullivan⁶, A A Vasenko⁷, A Veresnikova⁵, C Vignoli⁴, K von Sturm^{8

9}, T Wester¹⁸, C Wiesinger¹⁰, M Wojcik¹⁹, E Yanovich⁵, B Zatschler¹⁸, I Zhitnikov¹⁵, S V Zhukov³, D Zinatulina¹⁵, A Zschocke¹⁶, A J Zsigmond¹¹, K Zuber¹⁸, G Zuzel¹⁹; GERDA Collaboration

Affiliations

¹ Department of Physics and Astronomy, University College London, London, United Kingdom.
² Physik-Institut, Universität Zürich, Zurich, Switzerland.
³ National Research Centre "Kurchatov Institute," Moscow, Russia.
⁴ INFN Laboratori Nazionali del Gran Sasso, Assergi, Italy.
⁵ Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia.
⁶ Max-Planck-Institut für Kernphysik, Heidelberg, Germany.
⁷ Institute for Theoretical and Experimental Physics, NRC "Kurchatov Institute," Moscow, Russia.
⁸ Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, Padua, Italy.
⁹ INFN Padova, Padua, Italy.
¹⁰ Physik Department, Technische Universität München, Germany.
¹¹ Max-Planck-Institut für Physik, Munich, Germany.
¹² INFN Milano Bicocca, Milan, Italy.
¹³ INFN Laboratori Nazionali del Gran Sasso and Università degli Studi dell'Aquila, L'Aquila, Italy.
¹⁴ INFN Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Assergi, Italy.
¹⁵ Joint Institute for Nuclear Research, Dubna, Russia.
¹⁶ Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany.
¹⁷ European Commission, JRC-Geel, Geel, Belgium.
¹⁸ Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany.
¹⁹ Institute of Physics, Jagiellonian University, Cracow, Poland.
²⁰ INFN Laboratori Nazionali del Sud, Catania, Italy.
²¹ Dipartimento di Fisica, Università degli Studi di Milano and INFN Milano, Milan, Italy.

PMID: 37862664
DOI: 10.1103/PhysRevLett.131.142501

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).