Search for Two-Neutrino Double Electron Capture of ¹²⁴Xe with XENON100

The XENON Collaboration: E. Aprile , J. Aalbers , F. Agostini , M. Alfonsi , F. D. Amaro , M. Anthony , F. Arneodo , P. Barrow

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L. Baudis B. Bauermeister M. L. Benabderrahmane T. Berger P. A. Breur A. Brown E. Brown S. Bruenner G. Bruno R. Budnik L. B\"utikofer J. Calv\'en J. M. R. Cardoso M. Cervantes D. Cichon D. Coderre A. P. Colijn J. Conrad J. P. Cussonneau M. P. Decowski P. de Perio P. Di Gangi A. Di Giovanni S. Diglio E. Duchovni J. Fei A. D. Ferella A. Fieguth D. Franco W. Fulgione A. Gallo Rosso M. Galloway F. Gao M. Garbini C. Geis L. W. Goetzke Z. Greene C. Grignon C. Hasterok E. Hogenbirk R. Itay B. Kaminsky G. Kessler A. Kish H. Landsman R. F. Lang D. Lellouch L. Levinson M. Le Calloch C. Levy Q. Lin S. Lindemann M. Lindner J. A. M. Lopes A. Manfredini T. Marrod\'an Undagoitia J. Masbou F. V. Massoli D. Masson D. Mayani Y. Meng M. Messina K. Micheneau B. Miguez A. Molinario M. Murra J. Naganoma K. Ni U. Oberlack S. E. A. Orrigo P. Pakarha B. Pelssers R. Persiani F. Piastra J. Pienaar M.-C. Piro G. Plante N. Priel L. Rauch S. Reichard C. Reuter A. Rizzo S. Rosendahl N. Rupp J. M. F. dos Santos G. Sartorelli M. Scheibelhut S. Schindler J. Schreiner M. Schumann L. Scotto Lavina M. Selvi P. Shagin M. Silva H. Simgen M. v. Sivers A. Stein D. Thers A. Tiseni G. Trinchero C. D. Tunnell R. Wall H. Wang M. Weber Y. Wei C. Weinheimer J. Wulf Y. Zhang

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classification ⚛️ nucl-ex physics.ins-det

keywords capturedoubleelectrontwo-neutrinocdotnuclearobservedsearch

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Two-neutrino double electron capture is a rare nuclear decay where two electrons are simultaneously captured from the atomic shell. For $^{124}$Xe 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 $^{124}$Xe using 7636 kg$\cdot$d 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 $T_{1/2}>6.5\times10^{20}$ yr. We also evaluated the sensitivity of the XENON1T experiment, which is currently being commissioned, and find a sensitivity of $T_{1/2}>6.1\times10^{22}$ yr after an exposure of 2 t$\cdot$yr.

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Search for Two-Neutrino Double Electron Capture of ¹²⁴Xe with XENON100

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