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Observation of Two-Neutrino Double-Beta Decay in Xe-136 with EXO-200
N. Ackerman ; B. Aharmim ; M. Auger ; D.J. Auty ; P.S. Barbeau ; K. Barry ; L. Bartoszek ; E. Beauchamp ; V. Belov ; C. Benitez-Medina ; M. Breidenbach ; A. Burenkov ; B. Cleveland ; R. Conley ; E. Conti ; J. Cook ; S. Cook ; A. Coppens ; I. Counts ; W. Craddock ; T. Daniels ; M.V. Danilov ; C.G. Davis ; J. Davis ; R. deVoe ; Z. Djurcic ; A. Dobi ; A.G. Dolgolenko ; M.J. Dolinski ; K. Donato ; W. Fairbank Jr. ; J. Farine ; P. Fierlinger ; D. Franco ; D. Freytag ; G. Giroux ; R. Gornea ; K. Graham ; G. Gratta ; M.P. Green ; C. Hagemann ; C. Hall ; K. Hall ; G. Haller ; C. Hargrove ; R. Herbst ; S. Herrin ; J. Hodgson ; M. Hughes ; A. Johnson ; A. Karelin ; L.J. Kaufman ; T. Koffas ; A. Kuchenkov ; A. Kumar ; K.S. Kumar ; D.S. Leonard ; F. Leonard ; F. LePort ; D. Mackay ; R. MacLellan ; M. Marino ; Y. Martin ; B. Mong ; M. Montero Diez ; P. Morgan ; A.R. Muller ; R. Neilson ; R. Nelson ; A. Odian ; K. O'Sullivan ; C. Ouellet ; A. Piepke ; A. Pocar ; C.Y. Prescott ; K. Pushkin ; A. Rivas ; E. Rollin ; P.C. Rowson ; J.J. Russell ; A. Sabourov ; D. Sinclair ; K. Skarpaas ; S. Slutsky ; V. Stekhanov ; V. Strickland ; M. Swift ; D. Tosi ; K. Twelker ; P. Vogel ; J.-L. Vuilleumier ; J.-M. Vuilleumier ; A. Waite ; S. Waldman ; T. Walton ; K. Wamba ; M. Weber ; U. Wichoski ; J. Wodin ; J.D. Wright ; L. Yang ; Y.-R. Yen ; O.Ya. Zeldovich ;
Date:	21 Aug 2011
Abstract:	We report the observation of two-neutrino double-beta decay in Xe-136 with T_1/2 = 2.11 +- 0.04 (stat.) +- 0.21 (sys.) x 10^21 yr. This second order process, predicted by the Standard Model, has been observed for several nuclei but not for Xe-136. The observed decay rate provides new input to matrix element calculations and to the search for the more interesting neutrino-less double-beta decay, the most sensitive probe for the existence of Majorana particles and the measurement of the neutrino mass scale.
Source:	arXiv, 1108.4193
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