Search for two-neutrino double electron capture of Xe124 with XENON100

E. Aprile et al. (XENON Collaboration)
Phys. Rev. C 95, 024605 – Published 13 February 2017

Abstract

Two-neutrino double electron capture is a rare nuclear decay where two electrons are simultaneously captured from the atomic shell. For Xe124 this process has not yet been observed and its detection would provide a new reference for nuclear matrix element calculations. We have conducted a search for two-neutrino double electron capture from the K shell of Xe124 using 7636 kgd of data from the XENON100 dark matter detector. Using a Bayesian analysis we observed no significant excess above background, leading to a lower 90% credibility limit on the half-life T1/2>6.5×1020 yr. We have also evaluated the sensitivity of the XENON1T experiment, which is currently being commissioned, and found a sensitivity of T1/2>6.1×1022 yr after an exposure of 2 tyr.

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  • Received 12 September 2016

DOI:https://doi.org/10.1103/PhysRevC.95.024605

©2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

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Vol. 95, Iss. 2 — February 2017

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