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ID 115700
Author
Abe, K The University of Tokyo
Hiraide, K The University of Tokyo
Ichimura, K The University of Tokyo
Kishimoto, Y The University of Tokyo
Kobayashi, K The University of Tokyo
Kobayashi, M The University of Tokyo
Moriyama, S The University of Tokyo
Nakahata, M The University of Tokyo
Norita, T The University of Tokyo
Ogawa, H The University of Tokyo
Sato, K The University of Tokyo
Sekiya, H The University of Tokyo
Takachio, O The University of Tokyo
Takeda, A The University of Tokyo
Tasaka, S The University of Tokyo
Yamashita, M The University of Tokyo
Yang, B S The University of Tokyo
Kim, N Y Institute for Basic Science
Kim, Y D Institute for Basic Science
Itow, Y Nagoya University
Kanzawa, K Nagoya University
Kegasa, R Nagoya University
Masuda, K Nagoya University
Takiya, H Nagoya University
Kanzaki, G The University of Tokushima
Martens, K The University of Tokyo
Suzuki, Y The University of Tokyo
Xu, B D The University of Tokyo
Fujita, R Kobe University
Hosokawa, K Kobe University|Tohoku University
Miuchi, K Kobe University
Oka, N Kobe University
Takeuchi, Y Kobe University|The University of Tokyo
Kim, Y H Korea Research Institute of Standards and Science|Institute for Basic Science
Lee, K B Korea Research Institute of Standards and Science
Lee, M K Korea Research Institute of Standards and Science
Fukuda, Y Miyagi University of Education
Miyasaka, M Tokai University
Nishijima, K Tokai University
Nakamura, S Yokohama National University
Content Type
Journal Article
Description
We conducted an improved search for the simultaneous capture of two K-shell electrons on the 124Xe and 126Xe nuclei with emission of two neutrinos using 800.0 days of data from the XMASS-I detector. A novel method to discriminate γ-ray/X-ray or double electron capture signals from β-ray background using scintillation time profiles was developed for this search. No significant signal was found when fitting the observed energy spectra with the expected signal and background. Therefore, we set the most stringent lower limits on the half-lives at 2.1×1022 and 1.9×1022 years for 124Xe and 126Xe, respectively, with 90% confidence level. These limits improve upon previously reported values by a factor of 4.5.
Journal Title
Progress of Theoretical and Experimental Physics
ISSN
20503911
Publisher
The Physical Society of Japan|Oxford University Press
Volume
2018
Issue
5
Start Page
053D03
Published Date
2018-05-30
Rights
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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DOI (Published Version)
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language
eng
TextVersion
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departments
Science and Technology