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Search for 2 nu beta beta decay of Xe-136 to the 0(1)(+) excited state of Ba-136 with the EXO-200 liquid xenon detector
Journal article   Open access   Peer reviewed

Search for 2 nu beta beta decay of Xe-136 to the 0(1)(+) excited state of Ba-136 with the EXO-200 liquid xenon detector

J. B. Albert, D. J. Auty, P. S. Barbeau, D. Beck, V. Belov, M. Breidenbach, T. Brunner, A. Burenkov, G. F. Cao, C. Chambers, …
Physical review. C, v 93(3)
08 Mar 2016
DOI: https://doi.org/10.1103/PhysRevC.93.035501
url
https://doi.org/10.1103/physrevc.93.035501View
Accepted (AM)Open Access (Publisher-Specific),  Open
url
https://doi.org/10.1103/PhysRevC.93.035501View
Published, Version of Record (VoR) Open

Abstract

Physical Sciences Physics Physics, Nuclear Science & Technology
EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless pp decay of Xe-136 to the ground state of Ba-136. We report here on a search for the two -neutrino pp decay of Xe-136 to the first 0+ excited state, 0(1)(+), of Ba-136 based on a 100 kg yr exposure of Xe-136. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7 x 10(24) yr. We find no statistically significant evidence for the 20P decay to the excited state resulting in a lower limit of Ti-1/2(7 nu) (0(+) -> 0(1)(+)) > 6.9 x10(23) yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5 x 10(25) yr.

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Domestic collaboration
International collaboration
Web of Science research areas
Physics, Nuclear
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