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

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Title
Search for two-neutrino double electron capture on 124Xe with the XMASS-I detector
Author(s)
Abea K.; Hiraide K.; Ichimura K.; Kishimoto Y.; Kobayashi K.; Kobayashi, Moriyama S.; Nakagawa K.; Nakahata M.; Norita T.; Ogawa H.; Sekiya H.; Takachio O.; Takeda A.; Yamashita M.; Yang B.S.; N.Y. Kim; Y.D. Kim; Tasaka S.; Liud J.; Martens K.; Suzuki Y.; Fujita R.; Hosokawa K.; Miuchi K.; Oka N.; Onishi Y.; Takeuchi Y.; Y.H. Kim; J.S. Lee; Lee K.B.; Lee M.K.; Fukuda Y.; Itow Y.; Kegasa R.; Kobayashi K.; Masuda K.; Takiya H.; Uchidai H.; Nishijima K.; Fujii K.; Murayama I.; Nakamura S.
Publication Date
2016-08
Journal
PHYSICS LETTERS B, v.759, no., pp.64 - 68
Publisher
ELSEVIER SCIENCE BV
Abstract
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. © 2016 The Author(s)
URI
http://pr.ibs.re.kr/handle/8788114/2597
DOI
10.1016/j.physletb.2016.05.039
ISSN
0370-2693
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > Journal Papers (저널논문)
Files in This Item:
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