Final Results of GERDA on the Two-Neutrino Double-\(\beta\) Decay Half-Life of \(^{76}\)Ge

• Published in: arXiv.org
• Main Authors: collaboration, GERDA, Agostini, M, Alexander, A, Araujo, G R, Bakalyarov, A M, Baudis, L, Bauer, C, Belogurov, S, Bettini, A, Bezrukov, L, Biancacci, V, Bossio, E, Bothe, V, Caldwell, A, Calgaro, S, Cattadori, C, Chernogorov, A, P -J Chiu, Comellato, T, D'Andrea, V, Demidova, E V, N Di Marco, Doroshkevich, E, Fischer, F, Fomina, M, Garfagnini, A, Gooch, C, Grabmayr, P, Gurentsov, V, Gusev, K, Hackenmüller, S, Hemmer, S, Huang, J, Inzhechik, L V, Csáthy, J Janicskó, Jochum, J, Kazalov, V, Kermaïdic, Y, Khushbakht, H, Kihm, T, Kilgus, K, Kirpichnikov, I V, Klimenko, A, Knöpfle, K T, Kochetov, O, Kornoukhov, V N, Krause, P, Kuzminov, V V, Laubenstein, M, Lehnert, B, Lindner, M, Lippi, I, Lubsandorzhiev, B, Lutter, G, Macolino, C, Maneschg, W, Manzanillas, L, Marshall, G, Miloradovic, M, Mingazheva, R, Misiaszek, M, Morella, M, Müller, Y, Neuberger, M, Pandola, L, Pelczar, K, Pertoldi, L, Pullia, A, Ransom, C, Rauscher, L, Riboldi, S, Sada, C, Sailer, S, Salamida, F, Schreiner, J, Schütt, M, Schulz, O, Schwingenheuer, B, Selivanenko, O, Shirchenko, M, Shtembari, L, Simgen, H, Smolnikov, A, Stukov, D, Sullivan, S, Vasenko, A A, Veresnikova, A, Vignoli, C, Wester, T, Wiesinger, C, Wojcik, M, Yanovich, E, Zatschler, B, Zhitnikov, I, Zhukov, S V, Zinatulina, D, Zschocke, A, Zsigmond, A J, Zuber, K, Zuzel, G
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 18.08.2023
• Subjects: Beta decay; Decay rate; Half-life; Neutrinos

We present the measurement of the two-neutrino double-\(\beta\) decay rate of \(^{76}\)Ge performed with the GERDA Phase II experiment. With a subset of the entire GERDA exposure, 11.8 kg\(\cdot\)yr, the half-life of the process has been determined: \(T^{2\nu}_{1/2} = (2.022 \pm 0.018_{stat} \pm 0.038_{sys})\times10^{21}\) yr. This is the most precise determination of the \(^{76}\)Ge two-neutrino double-\(\beta\) decay half-life and one of the most precise measurements of a double-\(\beta\) decay process. The relevant nuclear matrix element can be extracted: \(M^{2\nu}_{\text{eff}} = (0.101\pm0.001).\)