Improved Measurement Of The 2 Nu Beta Beta Half-Life Of Xe-136 With The Exo-200 Detector

Justin B. Albert,Maria A. Auger,D. J. Auty,P. S. Barbeau,E. Beauchamp,Douglas H. Beck,V. A. Belov,C. Benitez-Medina,J. Bonatt,Martin Breidenbach,Thomas A. Brunner,A. A. Burenkov,G. F. Cao,Chris M. Chambers,J. Chaves, Bruce T. Cleveland,S. Cook,A. Craycraft,Tim Daniels,M. V. Danilov,S. J. Daugherty,C. G. Davis,James H. Davis,Ralph G. Devoe,S. C. Delaquis,A. Dobi,A. G. Dolgolenko,Michelle J. Dolinski,Monica A. Dunford,William M. Fairbank,Jacques Farine,W. Feldmeier,Peter Fierlinger,D. Franco,D. Fudenberg,G. Giroux,Razvan S. Gornea,Kenneth L. Graham,Giorgio Gratta,Christopher C. Hall,Kimberley C. Hall,Cliff K. Hargrove,S. Herrin,Marcus Dauth Hughes,X. S. Jiang,A. Johnson,Teresa N. Johnson,S. Johnston,A. K. Karelin,Lisa J. Kaufman,Ryan Killick,S. Kravitz,A. V. Kuchenkov,Kunal S. Kumar,Dauphinee S. L��onard,Fran?ois L��onard,C. Licciardi,Ryan F. MacLellan,M. G. Marino,B. Mong,M. Montero D��ez,David J. Moore,R. O. Nelson,Kevin O'Sullivan,Allen C. Odian,Igor Ostrovskiy,Christian V. Ouellet,Andreas G. Piepke,Andrea Pocar,C. Y. Prescott,A. Rivas,PC C. Rowson,M. P. Rozo,John J. Russell,A. L. Sabourov,D. Sinclair,Knut Skarpaas,S. Slutsky,V. N. Stekhanov,V. Strickland,M. Tarka,Tamer Tolba,D. Tosi,Karl Twelker,Petr Vogel,Jean Luc Vuilleumier,A. P. Waite,J. P. Walton,Thomas C. Walton,Marc S. Weber,L. J. Wen,Ubi F. Wichoski,Jesse Wodin,Jack D. Wright,L. Yang,Y. R. Yen,Olga Ya Zeldovich,Y. B. Zhao

PHYSICAL REVIEW C（2014）

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摘要

We report on an improved measurement of the 2 nu beta beta half-life of Xe-136 performed by EXO-200. The use of a large and homogeneous time-projection chamber allows for the precise estimate of the fiducial mass used for the measurement, resulting in a small systematic uncertainty. We also discuss in detail the data-analysis methods used for double-beta decay searches with EXO-200, while emphasizing those directly related to the present measurement. The Xe-136 2 nu beta beta half-life is found to be T-1/2(2 nu beta beta) = 2.165 +/- 0.016(stat) +/- 0.059(sys) x 10(21) yr. This is the most precisely measured half-life of any 2 nu beta beta decay to date.

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