Search for two neutrino double electron capture of ${}^{124}$Xe and ${}^{126}$Xe in the full exposure of the LUX detector

Abstract

Two-neutrino double electron capture is a process allowed in the Standard Model of Particle Physics. This rare decay has been observed in ${}^{78}$Kr, ${}^{130}$Ba and more recently in ${}^{124}$Xe. In this publication we report on the search for this process in ${}^{124}$Xe and ${}^{126}$Xe using the full exposure of the Large Underground Xenon (LUX) experiment, in a total of of 27769.5~kg-days. No evidence of a signal was observed, allowing us to set 90\% C.L. lower limits for the half-lives of these decays of $2.0\times 10^{21}$~years for ${}^{124}$Xe and $1.9\times 10^{21}$~years for ${}^{126}$Xe.

8 pages, 3 figures

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Cited by in corpus (5)

• Direct Detection of Dark Matter -- APPEC Committee Report
• Two-neutrino double electron capture of ${}^{124}$Xe in the first LUX-ZEPLIN exposure
• Theoretical analysis and predictions for the double electron capture of ${}^{124}$Xe
• Large-scale shell-model study of 2$\nu$ECEC process in ${}^{78}$Kr
• A measurement of the mean electronic excitation energy of liquid xenon