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, 107 (21), 212501

Observation of Two-Neutrino Double-Beta Decay in 136Xe With the EXO-200 Detector

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Observation of Two-Neutrino Double-Beta Decay in 136Xe With the EXO-200 Detector

N Ackerman et al. Phys Rev Lett.

Abstract

We report the observation of two-neutrino double-beta decay in (136)Xe with T(1/2) = 2.11 ± 0.04(stat) ± 0.21(syst) × 10(21) yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for (136)Xe. The observed decay rate provides new input to matrix element calculations and to the search for the more interesting neutrinoless 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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