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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

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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Cited by 1 Pith paper

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  1. Canadian Contributions to the Search for Neutrinoless Double Beta Decay

    nucl-ex 2025-06 unverdicted

    A review article that details past and present Canadian contributions to neutrinoless double beta decay searches and their theoretical interpretation.

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