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Agostini, M; Araujo, G R; Bakalyarov, A M; Barabanov, I; Baudis, L; Bauer, C; Belogurov, S; Bettini, A; Bezrukov, L; Borowicz, D; Bossio, E; Bothe, V; Brudanin, V; Brugnera, R; Caldwell, A; Cattadori, C; Chernogorov, A; Comellato, T; D'Andrea, V; Demidova, E V; Di Marco, N; Doroshkevich, E; Fischer, F; Fomina, M; Gangapshev, A; Garfagnini, A; Gooch, C; Grabmayr, P; Gurentsov, V; Gusev, K; Hakenmüller, J; Hemmer, S; Hiller, R; Huang, J; Hult, M; Inzhechik, L V; Janicskó Csáthy, J; Jochum, J; Junker, M; Kazalov, V; Kermaïdic, Y; Khushbakht, H; Kihm, T; Kirpichnikov, I V; Kneißl, R; Knöpfle, K T; Kornoukhov, V N; Krause, P; Kuzminov, V V; Laubenstein, M; Lindner, M; Lippi, I; Lubashevskiy, A; Lubsandorzhiev, B; Lutter, G; Macolino, C; Majorovits, B; Maneschg, W; Manzanillas, L; Miloradovic, M; Mingazheva, R; Misiaszek, M; Moseev, P; Müller, Y; Nemchenok, I; Panas, K; Pertoldi, L; Piseri, P; Pullia, A; Ransom, C; Rauscher, L; Riboldi, S; Rumyantseva, N; Sada, C; Salamida, F; Schönert, S; Schütt, M; Schütz, A-K; Schulz, O; Schwarz, M; Schwingenheuer, B; Selivanenko, O; Shevchik, E; Shirchenko, M; Shtembari, L; Simgen, H; Smolnikov, A; Stukov, D; Vasenko, A A; Veresnikova, A; Vignoli, C; von Sturm, K; Wester, T; Wiesinger, C; Wojcik, M; Yanovich, E; Zatschler, B; Zhitnikov, I; Zhukov, S V; Zsigmond, A J
Physical review letters, 2020-Dec-18, Volume: 125, Issue: 25Journal Article
The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-β (0νββ) decay of ^{76}Ge, whose discovery would have far-reaching implications in cosmology and particle physics. By operating bare germanium diodes, enriched in ^{76}Ge, in an active liquid argon shield, GERDA achieved an unprecedently low background index of 5.2×10^{-4} counts/(keV kg yr) in the signal region and met the design goal to collect an exposure of 100 kg yr in a background-free regime. When combined with the result of Phase I, no signal is observed after 127.2 kg yr of total exposure. A limit on the half-life of 0νββ decay in ^{76}Ge is set at T_{1/2}>1.8×10^{26} yr at 90% C.L., which coincides with the sensitivity assuming no signal.
