Searches for double beta decay of Xe134 with EXO-200

J. B. Albert,G. Anton,I. Badhrees,P. S. Barbeau, R. Bayerlein,D. Beck,V. Belov,M. Breidenbach,T. Brunner,G. F. Cao,W.R. Cen,C. Chambers,B. Cleveland,M. Coon,A. Craycraft, W. Cree,T. Daniels,M. Danilov,S. J. Daugherty, J. Daughhetee,J. Davis,S. Delaquis,A. Der Mesrobian-Kabakian,R. DeVoe, T. Didberidze,J. Dilling,A. Dolgolenko,M. J. Dolinski, W. Fairbank,J. Farine,S. Feyzbakhsh, P. Fierlinger,D. Fudenberg, R. Gornea,K. Graham,G. Gratta,C. Hall,J. Hoessl,P. Hufschmidt, M. Hughes,A. Jamil,M. J. Jewell, A. S. Johnson,S. Johnston,A. Karelin,L. J. Kaufman,T. Koffas,S. Kravitz,R. Krücken,A. Kuchenkov,K.S. Kumar,Y. Lan,D.S. Leonard,S. Li,C. Licciardi,Y. H. Lin,R. MacLellan,M. Marino,Thilo Michel,B. Mong,David C. Moore,K. Murray,R. Nelson,O. Njoya,A. Odian,I. Ostrovskiy,A. Piepke,A. Pocar,F. Retiere,P. C. Rowson, J. J. Russell,A. Schubert,David A. Sinclair,E. Smith,V. Stekhanov,M. Tarka,T. Tolba,R. Tsang,P. Vogel,J. L. Vuilleumier, M. Wagenpfeil, A. P. Waite,J. Walton,T. Walton,Michael A. Weber,L. Wen,U. Wichoski,L. Yang,Y. R. Yen,O. Ya. Zeldovich,J. Zettlemoyer,T. Ziegler

PHYSICAL REVIEW D（2017）

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摘要

Searches for double beta decay of Xe-134 were performed with EXO-200, a single-phase liquid xenon detector designed to search for neutrinoless double beta decay of Xe-136. Using an exposure of 29.6 kg center dot yr, the lower limits of T-1/2(2 nu beta beta) > 8.7 x 10(20) yr and T-1/2(0 nu beta beta) > 1.1 x 10(23) yr at 90% confidence level were derived, with corresponding half-life sensitivities of 1.2 x 10(21) yr and 1.9 x 10(23) yr. These limits exceed those in the literature for Xe-134, improving by factors of nearly 10(5) and 2 for the two antineutrino and neutrinoless modes, respectively.

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