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An improved measurement of the 2ν β β\ half-life of Xe-136 with EXO-200

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arxiv 1306.6106 v4 pith:PWDJYSSQ submitted 2013-06-25 nucl-ex hep-exphysics.ins-det

An improved measurement of the 2ν β β\ 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
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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 D\'iez 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
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classification nucl-ex hep-exphysics.ins-det
keywords betahalf-lifemeasurementexo-200xe-136decayimprovedused
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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 2.165 +- 0.016 (stat) +- 0.059 (sys) x 10^21 years. This is the most precisely measured half-life of any 2\nu \beta \beta\ decay to date.

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