Search for the Majorana nature of neutrinos in the inverted mass ordering region with KamLAND-Zen
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Published version
Date
2023-02-03
Authors
Abe, S.
Asami, S.
Eizuka, M.
Futagi, S.
Gando, A.
Gando, Y.
Gima, T.
Goto, A.
Hachiya, T.
Hata, K.
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Published version
OA Version
Citation
S. Abe, S. Asami, M. Eizuka, S. Futagi, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, S. Hayashida, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, M. Kurasawa, N. Maemura, T. Mitsui, H. Miyake, T. Nakahata, K. Nakamura, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, K. Ueshima, H. Watanabe, Y. Yoshida, S. Obara, A.K. Ichikawa, D. Chernyak, A. Kozlov, K.Z. Nakamura, S. Yoshida, Y. Takemoto, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B.E. Berger, B.K. Fujikawa, J.G. Learned, J. Maricic, S.N. Axani, J. Smolsky, Z. Fu, L.A. Winslow, Y. Efremenko, H.J. Karwowski, D.M. Markoff, W. Tornow, S. Dell'Oro, T. O'Donnell, J.A. Detwiler, S. Enomoto, M.P. Decowski, C. Grant, A. Li, H. Song, KamLAND-Zen Collaboration. 2023. "Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen." Physical Review Letters, Volume 130, Issue 5, pp.051801-. https://doi.org/10.1103/PhysRevLett.130.051801
Abstract
The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta (0νββ) decay half-life in ^136Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of ^136Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the 0νββ decay half-life of T_1/2^0ν>2.3×10^26 yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations.
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Attribution 4.0 International
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP.
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP.