Search for double-β decay of 76Ge to excited states of 76Se with the Majorana Demonstrator

Arnquist, Isaac J.; Avignone, F. T.; Barabash, A. S.; Barton, C. J.; Bertrand, F. E.; Blalock, E.; Bos, B.; Busch, M.; Buuck, M.; Caldwell, T. S.; Chan, Y-D; Christofferson, C. D.; Chu, P. -H.; Clark, M. L.; Cuesta, C.; Detwiler, J. A.; Drobizhev, A.; Edwards, T. R.; Edwins, D. W.; Efremenko, Yu; Ejiri, H.; Elliott, S. R.; Gilliss, T.; Giovanetti, G. K.; Green, M. P.; Gruszko, J.; Guinn, I. S.; Guiseppe, V. E.; Haufe, C. R.; Henning, R.; Hervas Aguilar, D.; Hoppe, Eric W.; Hostiuc, A.; Kidd, M. F.; Kim, I.; Kouzes, Richard T.; Lopez, A. M.; López-Castaño, J. M.; Martin, E. L.; Martin, R. D.; Massarczyk, R.; Meijer, S. J.; Mertens, S.; Myslik, J.; Oli, T. K.; Othman, G.; Paudel, L. S.; Pettus, W.; Poon, A. P.; Radford, D. C.; Reine, A. L.; Rielage, K.; Ruof, N. W.; Saykı, B.; Stortini, M. J.; Tedeschi, D.; Varner, R. L.; Vasilyev, S.; Wilkerson, J. F.; Wiseman, C.; Xu, W.; Yu, C. -H.; Zhu, B. X.

doi:10.1103/physrevc.103.015501

Title: Search for double-β decay of ⁷⁶Ge to excited states of ⁷⁶Se with the Majorana Demonstrator

Journal Article · Wed Jan 06 00:00:00 EST 2021 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.103.015501· OSTI ID:1768875

Arnquist, Isaac J. ^[1]; Avignone, F. T.; Barabash, A. S.; Barton, C. J.; Bertrand, F. E.; Blalock, E.; Bos, B.; Busch, M.; Buuck, M.; Caldwell, T. S.; Chan, Y-D; Christofferson, C. D.; Chu, P. -H.; Clark, M. L.; Cuesta, C.; Detwiler, J. A.; Drobizhev, A.; Edwards, T. R.; Edwins, D. W.; Efremenko, Yu more »

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

The MAJORANA DEMONSTRATOR is a neutrinoless double-β decay search consisting of a low-background modular array of high-purity germanium detectors, ~2/3 of which are enriched to 88% in ⁷⁶Ge. The experiment is also searching for double-beta decay of ⁷⁶Ge to excited states (e.s.) in ⁷⁶Se. ⁷⁶Ge can decay into three daughter states of ⁷⁶Se, with clear event signatures consisting of a ββ-decay followed by the prompt emission of one or two γ rays. This results with high probability in multi-detector coincidences. In this work, the granularity of the DEMONSTRATOR detector array enables powerful discrimination of this event signature from backgrounds. Using 41.9 kg yr of isotopic exposure, the DEMONSTRATOR has set world leading limits for each e.s. decay of ⁷⁶Ge, with 90% CL lower half-life limits in the range of (0.75–4.0) × 10²⁴ yr. In particular, for the 2ν transition to the first 0⁺ e.s. of ⁷⁶Se, a lower half-life limit of 7.5 × 10²³ yr at 90% CL was achieved.

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Research Organization:: University of North Carolina, Chapel Hill, NC (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Laboratory Directed Research and Development (LDRD) Program

Contributing Organization:: MAJORANA Collaboration; Majorana Collaboration

Grant/Contract Number:: FG02-97ER41041; AC05-00OR22725; AC02-05CH11231; AC05-76RL01830; FG02-97ER41020; FG02-97ER41033; SC0012612; SC0014445; SC0018060

OSTI ID:: 1768875

Alternate ID(s):: OSTI ID: 1772859; OSTI ID: 1827917; OSTI ID: 1834080; OSTI ID: 1834206; OSTI ID: 1957791

Report Number(s):: PNNL-SA-170284; TRN: US2206675

Journal Information:: Physical Review. C, Vol. 103, Issue 1; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Search for double-β decay of ⁷⁶Ge to excited states of ⁷⁶Se with the Majorana Demonstrator