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arxiv: 1912.02742 · v2 · pith:NWBY452Xnew · submitted 2019-12-05 · ⚛️ nucl-ex · physics.ins-det

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

LUX Collaboration: D. S. Akerib , S. Alsum , H. M. Ara\'ujo , X. Bai , J. Balajthy , A. Baxter , E. P. Bernard , A. Bernstein
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T. P. Biesiadzinski E. M. Boulton B. Boxer P. Br\'as S. Burdin D. Byram M. C. Carmona-Benitez C. Chan J. E. Cutter L. de Viveiros E. Druszkiewicz A. Fan S. Fiorucci R. J. Gaitskell C. Ghag M. G. D. Gilchriese C. Gwilliam C. R. Hall S. J. Haselschwardt S. A. Hertel D. P. Hogan M. Horn D. Q. Huang C. M. Ignarra R. G. Jacobsen O. Jahangir W. Ji K. Kamdin K. Kazkaz D. Khaitan E. V. Korolkova S. Kravits V. A. Kudryavtsev E. Leason B. G. Lenardo K. T. Lesko J. Liao J. Lin A. Lindote M. I. Lopes A. Manalaysay R. L. Mannino N. Marangou M. F. Marzioni D. N. McKinsey D. -M. Mei M. Moongweluwan J. A. Morad A. St. J. Murphy A. Naylor C. Nehrkorn H. N. Nelson F. Neves A. Nilima K. C. Oliver-Mallory K. J. Palladino E. K. Pease Q. Riffard G. R. C. Rischbieter C. Rhyne P. Rossiter S. Shaw T. A. Shutt C. Silva M. Solmaz V. N. Solovov P. Sorensen T. J. Sumner M. Szydagis D. J. Taylor R. Taylor W. C. Taylor B. P. Tennyson P. A. Terman D. R. Tiedt W. H. To M. Tripathi L. Tvrznikova U. Utku S. Uvarov A. Vacheret V. Velan R. C. Webb J. T. White T. J. Whitis M. S. Witherell F. L. H. Wolfs D. Woodward J. Xu C. Zhang
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classification ⚛️ nucl-ex physics.ins-det
keywords capturedoubleelectronexposurefullobservedprocesssearch
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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 $2.0\times10^{21}$~years for $^{124}$Xe and $1.9\times10^{21}$~years for $^{126}$Xe.

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