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

LUX Collaboration, Akerib D. S.,Alsum S.,Araújo H. M.,Bai X., Balajthy J.,Baxter A., Bernard E. P.,Bernstein A., Biesiadzinski T. P., Boulton E. M., Boxer B.,Brás P.,Burdin S., Byram D.,Carmona-Benitez M. C.,Chan C., Cutter J. E.,de Viveiros L.,Druszkiewicz E.,Fan A.,Fiorucci S.,Gaitskell R. J.,Ghag C.,Gilchriese M. G. D., Gwilliam C.,Hall C. R., Haselschwardt S. J., Hertel S. A., Hogan D. P.,Horn M., Huang D. Q., Ignarra C. M., Jacobsen R. G., Jahangir O., Ji W., Kamdin K.,Kazkaz K., Khaitan D.,Korolkova E. V., Kravits S., Kudryavtsev V. A., Leason E.,Lenardo B. G.,Lesko K. T.,Liao J.,Lin J.,Lindote A.,Lopes M. I., Manalaysay A., Mannino R. L., Marangou N., Marzioni M. F.,McKinsey D. N.,Mei D. -M., Moongweluwan M., Morad J. A.,Murphy A. St. J.,Naylor A.,Nehrkorn C., Nelson H. N.,Neves F.,Nilima A.,Oliver-Mallory K. C., Palladino K. J., Pease E. K.,Riffard Q., Rischbieter G. R. C., Rhyne C., Rossiter P.,Shaw S., Shutt T. A.,Silva C., Solmaz M.,Solovov V. N.,Sorensen P.,Sumner T. J., Szydagis M.,Taylor D. J.,Taylor R., Taylor W. C., Tennyson B. P.,Terman P. A.,Tiedt D. R., To W. H.,Tripathi M.,Tvrznikova L., Utku U., Uvarov S., Vacheret A.,Velan V.,Webb R. C.,White J. T., Whitis T. J.,Witherell M. S.,Wolfs F. L. H.,Woodward D.,Xu J.,Zhang C.

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS（2020）

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摘要

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,Ba-130 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 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 x 10(21)years for(124)Xe and 1.9 x 10(21)years for(126)Xe.

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关键词

rare decays,double electron capture,dark matter detectors,xenon detectors

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