論文

査読有り 本文へのリンクあり
2019年5月13日

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

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

122
19
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevLett.122.192501

© 2019 authors. Published by the American Physical Society. We present a precision analysis of the Xe136 two-neutrino ββ electron spectrum above 0.8 MeV, 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), ζ312ν=-0.26-0.25+0.31. 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 ζ312ν range allowed by the QRPA is excluded by the present measurement at the 90% confidence level. Our analysis reveals that predicted ζ312ν 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, ζ312ν provides new insights toward reliable neutrinoless ββ NMEs.

Web of Science ® 被引用回数 : 4

リンク情報
DOI
https://doi.org/10.1103/PhysRevLett.122.192501
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/31144924
Scopus
https://www.scopus.com/record/display.uri?eid=2-s2.0-85065833472&origin=inward
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000468227800004&DestApp=WOS_CPL
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85065833472&origin=inward 本文へのリンクあり
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