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  • Search for Majorana Neutrinos with the Complete KamLAND-Zen Dataset
    Abe, S; Araki, T; Chiba, K; Eda, T; Eizuka, M; Funahashi, Y; Furuto, A; Gando, A; Gando, Y; Goto, S; Hachiya, T; Hata, K; Ichimura, K; Ieki, S; Ikeda, H; Inoue, K; Ishidoshiro, K; Kamei, Y; Kawada, N; Kishimoto, Y; Koga, M; Marthe, A; Matsumoto, Y; Mitsui, T; Miyake, H; Morita, D; Nakajima, R; Nakamura, K; Nakamura, R; Nakane, J; Ono, T; Ozaki, H; Saito, K; Sakai, T; Shimizu, I; Shirai, J; Shiraishi, K; Suzuki, A; Tachibana, K; Tamae, K; Watanabe, H; Watanabe, K; Yoshida, S; Umehara, S; Fushimi, K; Kotera, K; Urano, Y; Berger, B E; Fujikawa, B K; Learned, J G; Maricic, J; Z Fu; Ghosh, S; Smolsky, J; Winslow, L A; Efremenko, Y; Karwowski, H J; Markoff, D M; Tornow, W; Dell'Oro, S; O'Donnell, T; Detwiler, J A; Enomoto, S; Decowski, M P; Weerman, K M; Grant, C; Penek, O; Song, H; A Li; Axani, S N; Garcia, M; Sarfraz, M

    arXiv.org, 06/2024
    Paper, Journal Article

    We present a search for neutrinoless double-beta (\(0\nu\beta\beta\)) decay of \(^{136}\)Xe using the full KamLAND-Zen 800 dataset with 745 kg of enriched xenon, corresponding to an exposure of \(2.097\) ton yr of \(^{136}\)Xe. This updated search benefits from a more than twofold increase in exposure, recovery of photo-sensor gain, and reduced background from muon-induced spallation of xenon. Combining with the search in the previous KamLAND-Zen phase, we obtain a lower limit for the \(0\nu\beta\beta\) decay half-life of \(T_{1/2}^{0\nu} > 3.8 \times 10^{26}\) yr at 90% C.L., a factor of 1.7 improvement over the previous limit. The corresponding upper limits on the effective Majorana neutrino mass are in the range 28-122 meV using phenomenological nuclear matrix element calculations.

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