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Search for two-neutrino double electron capture on 124Xe with the XMASS-I detector
- Source :
- Physics Letters B, Vol 759, Iss C, Pp 64-68 (2016)
- Publication Year :
- 2016
- Publisher :
- Elsevier, 2016.
-
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.
- Subjects :
- Double electron capture
Neutrino
Liquid xenon
Physics
QC1-999
Subjects
Details
- Language :
- English
- ISSN :
- 03702693 and 18732445
- Volume :
- 759
- Issue :
- C
- Database :
- Directory of Open Access Journals
- Journal :
- Physics Letters B
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.32062a5795a342f5a21e7df0327148d5
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.physletb.2016.05.039