Observation of Two-Neutrino Double-Beta Decay in [superscript 136]Xe with the EXO-200 Detector
We report the observation of two-neutrino double-beta decay in [superscript 136]Xe with T[subscript 1/2]=2.11±0.04(stat)±0.21(syst)×10[superscript 21] yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for [superscript 136]Xe. The observed d...
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society,
2012-05-18T18:41:55Z.
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| Online Access: | Get fulltext |
| Summary: | We report the observation of two-neutrino double-beta decay in [superscript 136]Xe with T[subscript 1/2]=2.11±0.04(stat)±0.21(syst)×10[superscript 21] yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for [superscript 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. National Science Foundation (U.S.) United States. Dept. of Energy Natural Sciences and Engineering Research Council of Canada (NSERC) Swiss National Science Foundation Russian Foundation for Basic Research |
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