number of access : ?
number of downloads : ?
ID 115687
Author
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
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
Content Type
Journal Article
Description
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.
Journal Title
Physical Review Letters
ISSN
00319007
10797114
NCID
AA00773679
AA11734748
Publisher
American Physical Society
Volume
122
Issue
19
Start Page
192501
Published Date
2019-05-13
Rights
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
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Publisher
departments
Science and Technology