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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.; [...]

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

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  • Medientyp: E-Artikel
  • Titel: Results of the MAJORANA DEMONSTRATOR’s Search for Double-Beta Decay of 76Ge to Excited States of 76Se
  • Beteiligte: 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.; [...]
  • Erschienen: IOP Publishing, 2020
  • Erschienen in: Journal of Physics: Conference Series
  • Sprache: Nicht zu entscheiden
  • DOI: 10.1088/1742-6596/1468/1/012115
  • ISSN: 1742-6588; 1742-6596
  • Schlagwörter: General Physics and Astronomy
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:title>Abstract</jats:title> <jats:p>The MAJORANA DEMONSTRATOR is searching for double-beta decay of <jats:sup>76</jats:sup>Ge to excited states (E.S.) in <jats:sup>76</jats:sup>Se using a modular array of high purity Germanium detectors. <jats:sup>76</jats:sup>Ge can decay into three E.S.s of <jats:sup>76</jats:sup>Se. The E.S. decays have a clear event signature consisting of a <jats:italic>ββ</jats:italic>-decay with the prompt emission of one or two <jats:italic>γ</jats:italic>-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<jats:sup>24</jats:sup> y. In particular, for the 2<jats:italic>v</jats:italic> transition to the first 0<jats:sup>+</jats:sup> E.S. of <jats:sup>76</jats:sup>Se, a lower half-life limit of 0.68 ⋅ 10<jats:sup>24</jats:sup> at 90% CL was achieved.</jats:p>
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