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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

Albert, J. B. and Cleveland, B. and Der Mesrobian-Kabakian, A. and Farine, J. and Mong, B. and Wichoski, U. (2016) Search for 2νββ decay of ^(136)Xe to the 0^+^1 excited state of ^(136)Ba with the EXO-200 liquid xenon detector. Physical Review C, 93 (3). Art. No. 035501 . ISSN 0556-2813.

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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.

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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.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Swiss National Fund (SNF)UNSPECIFIED
Institute for Basic Science (Korea)UNSPECIFIED
Russian Foundation for Basic ResearchRFBR-14-02-00675
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Chinese Academy of SciencesUNSPECIFIED
Institute of High Energy Physics (China)UNSPECIFIED
International Science and Technology Cooperation Association (ISTCP), China2015DFG02000
Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:3
Record Number:CaltechAUTHORS:20160405-082002655
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Official Citation:Search for 2νββ decay of Xe136 to the 0+1 excited state of Ba136 with the EXO-200 liquid xenon detector J. B. Albert et al. (EXO-200 Collaboration) Phys. Rev. C 93, 035501 (2016) – Published 8 March 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65916
Deposited By: Ruth Sustaita
Deposited On:05 Apr 2016 16:09
Last Modified:03 Oct 2019 09:51

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