論文

2016年8月

Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen

PHYSICAL REVIEW LETTERS
  • A. Gando
  • ,
  • Y. Gando
  • ,
  • T. Hachiya
  • ,
  • A. Hayashi
  • ,
  • S. Hayashida
  • ,
  • H. Ikeda
  • ,
  • K. Inoue
  • ,
  • K. Ishidoshiro
  • ,
  • Y. Karino
  • ,
  • M. Koga
  • ,
  • S. Matsuda
  • ,
  • T. Mitsui
  • ,
  • K. Nakamura
  • ,
  • S. Obara
  • ,
  • T. Oura
  • ,
  • H. Ozaki
  • ,
  • I. Shimizu
  • ,
  • Y. Shirahata
  • ,
  • J. Shirai
  • ,
  • A. Suzuki
  • ,
  • T. Takai
  • ,
  • K. Tamae
  • ,
  • Y. Teraoka
  • ,
  • K. Ueshima
  • ,
  • H. Watanabe
  • ,
  • A. Kozlov
  • ,
  • Y. Takemoto
  • ,
  • S. Yoshida
  • ,
  • K. Fushimi
  • ,
  • T. I. Banks
  • ,
  • B. E. Berger
  • ,
  • B. K. Fujikawa
  • ,
  • T. O'Donnell
  • ,
  • L. A. Winslow
  • ,
  • Y. Efremenko
  • ,
  • H. J. Karwowski
  • ,
  • D. M. Markoff
  • ,
  • W. Tornow
  • ,
  • J. A. Detwiler
  • ,
  • S. Enomoto
  • ,
  • M. P. Decowski

117
8
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevLett.117.082503
出版者・発行元
AMER PHYSICAL SOC

We present an improved search for neutrinoless double-beta (0 nu beta beta) decay of Xe-136 in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the Ag-110m contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the 0 nu beta beta decay half-life of T-1/2(0 nu) > 1.07 x 10(26) yr at 90% C.L., an almost sixfold improvement over previous limits. Using commonly adopted nuclear matrix element calculations, the corresponding upper limits on the effective Majorana neutrino mass are in the range 61-165 meV. For the most optimistic nuclear matrix elements, this limit reaches the bottom of the quasidegenerate neutrino mass region.

Web of Science ® 被引用回数 : 373

リンク情報
DOI
https://doi.org/10.1103/PhysRevLett.117.082503
Scopus
https://www.scopus.com/record/display.uri?eid=2-s2.0-84985032715&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:000381495900001&DestApp=WOS_CPL
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84985032715&origin=inward

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