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Guinn, I.S.; Arnquist, I.J.; Avignone, F.T.; Barabash, A.S.; Barton, C. J.; Bertrand, F.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.; Edwins, D. W.; Efremenko, Yu; Ejiri, H.; Elliott, S.R.; Gilliss, T.; Giovanetti, G.K.; Green, M.P.; Gruszko, J.; Guiseppe, V.E.; Haufe, C.R.; Hegedus, R.J.; Henning, R.; Hervas Aguilar, D.; Hoppe, E.W.; Hostiuc, A.; Kidd, M.F.; Kim, I.; Kouzes, R.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.; Pettus, W.; Poon, A.W.P.; Radford, D.C.; Rager, J.; Reine, A.L.; Rielage, K.; Ruof, N.W.; Stortini, M.J.; Tedeschi, D.; Varner, R.L.; Wilkerson, J.F.; Wiseman, C.; Xu, W.; Yu, C.-H.; Zhu, B.X.
Journal of physics. Conference series, 02/2020, Letnik: 1468, Številka: 1Journal Article
The MAJORANA DEMONSTRATOR is searching for double-beta decay of 76Ge to excited states (E.S.) in 76Se using a modular array of high purity Germanium detectors. 76Ge can decay into three E.S.s of 76Se. The E.S. decays have a clear event signature consisting of a ββ-decay with the prompt emission of one or two γ-rays, resulting in with high probability in a multi-site event. The granularity of the DEMONSTRATOR detector array enables powerful discrimination of this event signature from backgrounds. Using 21.3 kg-y of isotopic exposure, the DEMONSTRATOR has set world leading limits for each E.S. decay, with 90% CL lower half-life limits in the range of (0.56 ‒ 2.1) ⋅ 1024 y. In particular, for the 2v transition to the first 0+ E.S. of 76Se, a lower half-life limit of 0.68 ⋅ 1024 at 90% CL was achieved.
