Precision Analysis of the 136Xe Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements

Gando, A.; Gando, Y.; Hachiya, T.; Minh, M. Ha; Hayashida, S.; Honda, Y.; Hosokawa, K.; Ikeda, H.; Inoue, K.; Ishidoshiro, K.; Kamei, Y.; Kamizawa, K.; Kinoshita, T.; Koga, M.; Matsuda, S.; Mitsui, T.; Nakamura, K.; Ono, A.; Ota, N.; Otsuka, S.; Ozaki, H.; Shibukawa, Y.; Shimizu, I.; Shirahata, Y.; Shirai, J.; Sato, T.; Soma, K.; Suzuki, A.; Takeuchi, A.; Tamae, K.; Ueshima, K.; Watanabe, H.; Chernyak, D.; Kozlov, A.; Obara, S.; Yoshida, S.; Takemoto, Y.; Umehara, S.; Fushimi, Ken-Ichi; Hirata, S.; Berger, B. E.; Fujikawa, B. K.; Learned, J. G.; Maricic, J.; Winslow, L. A.; Efremenko, Y.; Karwowski, H. J.; Markoff, D. M.; Tornow, W.; O’Donnell, T.; Detwiler, J. A.; Enomoto, S.; Decowski, M. P.; Menéndez, J.; Dvornický, R.; Šimkovic, F.

doi:10.1103/PhysRevLett.122.192501

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ID	115687
著者	Gando, A. Tohoku University Gando, Y. Tohoku University Hachiya, T. Tohoku University Minh, M. Ha Tohoku University Hayashida, S. Tohoku University Honda, Y. Tohoku University Hosokawa, K. Tohoku University Ikeda, H. Tohoku University Inoue, K. Tohoku University\|The University of Tokyo Ishidoshiro, K. Tohoku University Kamei, Y. Tohoku University Kamizawa, K. Tohoku University Kinoshita, T. Tohoku University Koga, M. Tohoku University\|The University of Tokyo Matsuda, S. Tohoku University Mitsui, T. Tohoku University Nakamura, K. Tohoku University\|The University of Tokyo Ono, A. Tohoku University Ota, N. Tohoku University Otsuka, S. Tohoku University Ozaki, H. Tohoku University Shibukawa, Y. Tohoku University Shimizu, I. Tohoku University Shirahata, Y. Tohoku University Shirai, J. Tohoku University Sato, T. Tohoku University Soma, K. Tohoku University Suzuki, A. Tohoku University Takeuchi, A. Tohoku University Tamae, K. Tohoku University Ueshima, K. Tohoku University Watanabe, H. Tohoku University Chernyak, D. The University of Tokyo Kozlov, A. The University of Tokyo Obara, S. Kyoto University Yoshida, S. Osaka University Takemoto, Y. Osaka University Umehara, S. Osaka University 伏見, 賢一 Tokushima University 徳島大学教育研究者総覧 KAKEN研究者をさがす Hirata, S. Tokushima University Berger, B. E. The University of Tokyo\|Lawrence Berkeley National Laboratory Fujikawa, B. K. The University of Tokyo\|Lawrence Berkeley National Laboratory Learned, J. G. University of Hawaii at Manoa Maricic, J. University of Hawaii at Manoa Winslow, L. A. Massachusetts Institute of Technology Efremenko, Y. The University of Tokyo\|University of Tennessee Karwowski, H. J. Triangle Universities Nuclear Laboratory\|Duke University\|North Carolina Central University Markoff, D. M. Triangle Universities Nuclear Laboratory\|Duke University\|North Carolina Central University Tornow, W. The University of Tokyo\|Triangle Universities Nuclear Laboratory\|Duke University\|North Carolina Central University O’Donnell, T. Virginia Polytechnic Institute and State University Detwiler, J. A. The University of Tokyo\|University of Washington Enomoto, S. The University of Tokyo\|University of Washington Decowski, M. P. The University of Tokyo\|Nikhef\|The University of Amsterdam Menéndez, J. The University of Tokyo Dvornický, R. Comenius University\|JINR Šimkovic, F. Comenius University\|JINR\|Czech Technical University in Prague
資料タイプ	学術雑誌論文
抄録	We present a precision analysis of the 136Xe two-neutrino ββ electron spectrum above 0.8MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino ββ rate allows us to measure the ratio of the leading and subleading 2νββ nuclear matrix elements (NMEs), ξ2ν31 = −0.26 +0.31−0.25. Theoretical predictions from the nuclear shell model and the majority of the quasiparticle random-phase approximation (QRPA) calculations are consistent with the experimental limit. However, part of the ξ2ν31 range allowed by the QRPA is excluded by the present measurement at the 90% confidence level. Our analysis reveals that predicted ξ2ν31 values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Because these aspects are also at play in neutrinoless ββ decay, ξ2ν31 provides new insights toward reliable neutrinoless ββ NMEs.
掲載誌名	Physical Review Letters
ISSN	00319007 10797114
cat書誌ID	AA00773679 AA11734748
出版者	American Physical Society
巻	122
号	19
開始ページ	192501
発行日	2019-05-13
権利情報	Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license(https://creativecommons.org/licenses/by/4.0/). Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
EDB ID	362807
出版社版DOI	10.1103/PhysRevLett.122.192501
出版社版URL	https://doi.org/10.1103/PhysRevLett.122.192501
フルテキストファイル	prl_122_19_192501.pdf 421 KB
言語	eng
著者版フラグ	出版社版
部局	理工学系