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.

Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F., Anthony, M., et al. (2017). Search for two-neutrino double electron capture of Xe 124 with XENON100. PHYSICAL REVIEW C, 95(2), 1-6 [10.1103/PhysRevC.95.024605].

Search for two-neutrino double electron capture of Xe 124 with XENON100

DI GANGI, PIETRO;Garbini, M.;MASSOLI, FABIO VALERIO;SARTORELLI, GABRIELLA;SELVI, MARCO;
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.
2017
Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F., Anthony, M., et al. (2017). Search for two-neutrino double electron capture of Xe 124 with XENON100. PHYSICAL REVIEW C, 95(2), 1-6 [10.1103/PhysRevC.95.024605].
Aprile, E.; Aalbers, J.; Agostini, F.; Alfonsi, M.; Amaro, F.D.; Anthony, M.; Arneodo, F.; Barrow, P.; Baudis, L.; Bauermeister, B.; Benabderrahmane, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/599406
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