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Observation of Two-Neutrino Double-Beta Decay in Xe-136 with EXO-200

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arxiv 1108.4193 v2 pith:QY4RI7PR submitted 2011-08-21 nucl-ex hep-exphysics.ins-det

N. Ackerman , B. Aharmim , M. Auger , D. J. Auty , P. S. Barbeau , K. Barry , L. Bartoszek , E. Beauchamp
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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
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classification nucl-exhep-exphysics.ins-det
keywords decaydouble-betaxe-136observationobservedtwo-neutrinobeencalculations
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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