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An improved measurement of the 2 u eta eta half-life of Xe-136 with EXO-200
J.B. Albert ; M. Auger ; D.J. Auty ; P.S. Barbeau ; E. Beauchamp ; D. Beck ; V. Belov ; C. Benitez-Medina ; J. Bonatt ; M. Breidenbach ; T. Brunner ; A. Burenkov ; G.F. Cao ; C. Chambers ; J. Chaves ; B. Cleveland ; S. Cook ; T. Daniels ; M. Danilov ; S.J. Daugherty ; C.G. Davis ; J. Davis ; S. Delaquis ; R. DeVoe ; A. Dobi ; M.J. Dolinski ; A. Dolgolenko ; M. Dunford ; W. Fairbank Jr. ; J. Farine ; W. Feldmeier ; P. Fierlinger ; D. Franco ; D. Fudenberg ; G. Giroux ; R. Gornea ; K. Graham ; G. Gratta ; C. Hall ; K. Hall ; C. Hargrove ; S. Herrin ; M. Hughes ; X.S. Jiang ; A. Johnson ; T.N. Johnson ; S. Johnston ; A. Karelin ; L.J. Kaufman ; R. Killick ; S. Kravitz ; A. Kuchenkov ; K.S. Kumar ; D.S. Leonard ; F. Leonard ; C. Licciardi ; R. MacLellan ; M.G. Marino ; B. Mong ; M. Montero Díez ; D. Moore ; R. Nelson ; A. Odian ; I. Ostrovskiy ; K. O'Sullivan ; C. Ouellet ; A. Piepke ; A. Pocar ; C.Y. Prescott ; A. Rivas ; P.C. Rowson ; M.P. Rozo ; J.J. Russell ; A. Sabourov ; D. Sinclair ; K. Skarpaas ; S. Slutsky ; V. Stekhanov ; V. Strickland ; M. Tarka ; T. Tolba ; D. Tosi ; K. Twelker ; P. Vogel ; J.-L. Vuilleumier ; A. Waite ; J. Walton ; T. Walton ; M. Weber ; L.J. Wen ; U. Wichoski ; J. Wodin ; J.D. Wright ; L. Yang ; Y.-R. Yen ; O.Ya. Zeldovich ; Y.B. Zhao ;
Date:	26 Jun 2013
Abstract:	We report on an improved measurement of the 2 u eta eta 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 u eta eta half-life is found to be 2.172 +- 0.017 (stat) +- 0.060 (sys) x 10^21 years. This is the most precisely measured half-life of any 2 u eta eta decay to date.
Source:	arXiv, 1306.6106
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