Search for Majorana Neutrinos with the Complete KamLAND-Zen Dataset.
Journal articles
- Journal Article
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; Fu, Z ...
Published in: Physical review letters
December 2025
We present a search for neutrinoless double-beta (0νββ) decay of ^{136}Xe using the full KamLAND-Zen 800 dataset with 745 kg of enriched xenon, corresponding to an exposure of 2.1 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 0νββ decay halflife of T_{1/2}^{0ν}>3.8×10^{26} yr at 90% CL, 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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Published In
Physical review letters
DOI
EISSN
1079-7114
ISSN
0031-9007
Publication Date
December 2025
Volume
135
Issue
26
Start / End Page
262501
Related Subject Headings
- General Physics
- 51 Physical sciences
- 49 Mathematical sciences
- 40 Engineering
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Abe, S., Araki, T., Chiba, K., Eda, T., Eizuka, M., Funahashi, Y., … KamLAND-Zen Collaboration. (2025). Search for Majorana Neutrinos with the Complete KamLAND-Zen Dataset. Physical Review Letters, 135(26), 262501. https://doi.org/10.1103/jkf6-48j8
Abe, S., T. Araki, K. Chiba, T. Eda, M. Eizuka, Y. Funahashi, A. Furuto, et al. “Search for Majorana Neutrinos with the Complete KamLAND-Zen Dataset.” Physical Review Letters 135, no. 26 (December 2025): 262501. https://doi.org/10.1103/jkf6-48j8.
Abe S, Araki T, Chiba K, Eda T, Eizuka M, Funahashi Y, et al. Search for Majorana Neutrinos with the Complete KamLAND-Zen Dataset. Physical review letters. 2025 Dec;135(26):262501.
Abe, S., et al. “Search for Majorana Neutrinos with the Complete KamLAND-Zen Dataset.” Physical Review Letters, vol. 135, no. 26, Dec. 2025, p. 262501. Epmc, doi:10.1103/jkf6-48j8.
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 BE, Fujikawa BK, Learned JG, Maricic J, Fu Z, Ghosh S, Smolsky J, Winslow LA, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, Dell’Oro S, O’Donnell T, Detwiler JA, Enomoto S, Decowski MP, Weerman KM, Grant C, Penek Ö, Song H, Li A, Axani SN, Garcia M, Sarfraz M, KamLAND-Zen Collaboration. Search for Majorana Neutrinos with the Complete KamLAND-Zen Dataset. Physical review letters. 2025 Dec;135(26):262501.
Published In
Physical review letters
DOI
EISSN
1079-7114
ISSN
0031-9007
Publication Date
December 2025
Volume
135
Issue
26
Start / End Page
262501
Related Subject Headings
- General Physics
- 51 Physical sciences
- 49 Mathematical sciences
- 40 Engineering