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Search for $2\nu\beta\beta$ decay of $^136$Xe to the 0$_1^+$ excited state of $^136$Ba with EXO-200

Submit Time: 2016-09-12
Author: Albert, J. B. and others 1 ;
Institute: 1.EXO-200 Collaboration;

Abstracts

EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of?136Xe to the ground state of?136Ba. We report here on a search for the two-neutrino double-beta decay of?136Xe to the first?0+?excited state,?0+1, of?136Ba based on a 100 kg?yr exposure of?136Xe. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of?1.7×1024?yr. We find no statistically significant evidence for the?2νββ?decay to the excited state resulting in a lower limit of?T2ν1/2?(0+→0+1)?>6.9×1023?yr at 90% CL. This observed limit is consistent with the estimated half-life of?2.5×1025?yr.
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Keywords: EXO-200;
Recommended references: Albert, J. B. and others.(2016).Search for $2\nu\beta\beta$ decay of $^136$Xe to the 0$_1^+$ excited state of $^136$Ba with EXO-200.[ChinaXiv:201609.00793] (Click&Copy)
Version History
[V1] 2016-09-12 09:01:30 chinaXiv:201609.00793V1 Download
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