Published March 2016
| Published
Journal Article
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Search for 2νββ decay of ^(136)Xe to the 0^+^1 excited state of ^(136)Ba with the EXO-200 liquid xenon detector
Abstract
EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of ^(136)Xe to the ground state of ^(136)Ba. We report here on a search for the two-neutrino ββ decay of 136Xe to the first 0+ excited state, 0^+_1, of ^(136)Ba based on a 100 kg yr exposure of ^(136)Xe. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7 × 10^(24) yr. We find no statistically significant evidence for the 2νββ decay to the excited state resulting in a lower limit of T^(2ν)_(1/2)(0^+ → 0^+_1) > 6.9 ×10^(23) yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5 × 10^(25) yr.
Additional Information
© 2016 American Physical Society. Received 16 November 2015; published 8 March 2016. The collaboration gratefully acknowledges Thilo Michel for valuable discussions, the KARMEN collaboration for supplying the cosmic-ray veto detectors, and the WIPP for their hospitality. EXO-200 is supported by DOE and NSF in the United States, NSERC in Canada, SNF in Switzerland, IBS in Korea, RFBR-14-02-00675 in Russia, DFG Cluster of Excellence "Universe" in Germany, and CAS-IHEP Fund and ISTCP (2015DFG02000) in China. EXO-200 data analysis and simulation uses resources of the National Energy Research Scientific Computing Center (NERSC), which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.Attached Files
Published - PhysRevC.93.035501.pdf
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PhysRevC.93.035501.pdf
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Additional details
- Eprint ID
- 65916
- Resolver ID
- CaltechAUTHORS:20160405-082002655
- Department of Energy (DOE)
- NSF
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Swiss National Fund (SNF)
- Institute for Basic Science (Korea)
- Russian Foundation for Basic Research
- RFBR-14-02-00675
- Deutsche Forschungsgemeinschaft (DFG)
- Chinese Academy of Sciences
- Institute of High Energy Physics (China)
- International Science and Technology Cooperation Association (ISTCP), China
- 2015DFG02000
- Department of Energy (DOE)
- DE-AC02-05CH11231
- Created
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2016-04-05Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field