Results of the MAJORANA DEMONSTRATOR’s Search for Double-Beta Decay of 76Ge to Excited States of 76Se

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ID: 114365
2020
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Abstract
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.
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Authors I.S. Guinn, I.J. Arnquist, F.T. Avignone, A.S. Barabash, C. J. Barton, F.E. Bertrand, B. Bos, M. Busch, M. Buuck, T.S. Caldwell, Y-D. Chan, C.D. Christofferson, P-H. Chu, M.L. Clark, C. Cuesta, J.A. Detwiler, A. Drobizhev, D. W. Edwins, Yu. Efremenko, H. Ejiri, S.R. Elliott, T. Gilliss, G.K. Giovanetti, M.P. Green, J. Gruszko, V.E. Guiseppe, C.R. Haufe, R.J. Hegedus, R. Henning, D. Hervas Aguilar, E.W. Hoppe, A. Hostiuc, M.F. Kidd, I. Kim, R.T. Kouzes, A.M. Lopez, J.M. López-Castaño, E. L. Martin, R.D. Martin, R. Massarczyk, S.J. Meijer, S. Mertens, J. Myslik, T.K. Oli, G. Othman, W. Pettus, A.w.p. Poon, D.C. Radford, J. Rager, A.L. Reine, K. Rielage, N.W. Ruof, M.J. Stortini, D. Tedeschi, R.L. Varner, J.F. Wilkerson, C. Wiseman, W. Xu, C.-H. Yu, B.X. Zhu
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Journal journal of physics: conference series
Year 2020
DOI
10.1088/1742-6596/1468/1/012115
URL
https://sciprofiles.com/publication/view/75896f27063698c3d5376881f1ed2f67
Keywords
beta double majorana excited e.s 76se decay of 76ge

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