Search for two-neutrino double electron capture on 124Xe with the XMASS-I detector

XMASS Collaboration

研究成果: Article査読

8 被引用数 (Scopus)

抄録

Double electron capture is a rare nuclear decay process in which two orbital electrons are captured simultaneously in the same nucleus. Measurement of its two-neutrino mode would provide a new reference for the calculation of nuclear matrix elements whereas observation of its neutrinoless mode would demonstrate lepton number violation. A search for two-neutrino double electron capture on 124Xe is performed using 165.9 days of data collected with the XMASS-I liquid xenon detector. No significant excess above background was observed and we set a lower limit on the half-life as 4.7×1021 years at 90% confidence level. The obtained limit has ruled out parts of some theoretical expectations. We obtain a lower limit on the 126Xe two-neutrino double electron capture half-life of 4.3×1021 years at 90% confidence level as well.

本文言語English
ページ(範囲)64-68
ページ数5
ジャーナルPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
759
DOI
出版ステータスPublished - 2016 8月 10
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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