In:
Journal of Physics: Conference Series, IOP Publishing, Vol. 1468, No. 1 ( 2020-02-01), p. 012115-
Abstract:
The MAJORANA DEMONSTRATOR is searching for double-beta decay of 76 Ge to excited states (E.S.) in 76 Se using a modular array of high purity Germanium detectors. 76 Ge can decay into three E.S.s of 76 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 24 y. In particular, for the 2 v transition to the first 0 + E.S. of 76 Se, a lower half-life limit of 0.68 ⋅ 10 24 at 90% CL was achieved.
Type of Medium:
Online Resource
ISSN:
1742-6588
,
1742-6596
DOI:
10.1088/1742-6596/1468/1/012115
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2020
detail.hit.zdb_id:
2166409-2
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