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

  • Author(s): Guinn, IS
  • Arnquist, IJ
  • Avignone, FT
  • Barabash, AS
  • Barton, CJ
  • Bertrand, FE
  • Bos, B
  • Busch, M
  • Buuck, M
  • Caldwell, TS
  • Chan, YD
  • Christofferson, CD
  • Chu, PH
  • Clark, ML
  • Cuesta, C
  • Detwiler, JA
  • Drobizhev, A
  • Edwins, DW
  • Efremenko, Y
  • Ejiri, H
  • Elliott, SR
  • Gilliss, T
  • Giovanetti, GK
  • Green, MP
  • Gruszko, J
  • Guiseppe, VE
  • Haufe, CR
  • Hegedus, RJ
  • Henning, R
  • Hervas Aguilar, D
  • Hoppe, EW
  • Hostiuc, A
  • Kidd, MF
  • Kim, I
  • Kouzes, RT
  • Lopez, AM
  • López-Castano, JM
  • Martin, EL
  • Martin, RD
  • Massarczyk, R
  • Meijer, SJ
  • Mertens, S
  • Myslik, J
  • Oli, TK
  • Othman, G
  • Pettus, W
  • Poon, AWP
  • Radford, DC
  • Rager, J
  • Reine, AL
  • Rielage, K
  • Ruof, NW
  • Stortini, MJ
  • Tedeschi, D
  • Varner, RL
  • Wilkerson, JF
  • Wiseman, C
  • Xu, W
  • Yu, CH
  • Zhu, BX
  • et al.
Abstract

The MAJORANA DEMONSTRATOR is searching for double-beta decay of Ge to excited states (E.S.) in Se using a modular array of high purity Germanium detectors. Ge can decay into three E.S.s of Se. 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) ⋅ 10 y. In particular, for the 2v transition to the first 0 E.S. of Se, a lower half-life limit of 0.68 ⋅ 10 at 90% CL was achieved. 76 76 76 76 24 + 76 24

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