Double Beta Decay of 100Mo to Excited Final States
Abstract
A systematic study of the inclusive (0+2) double beta (ββ) decay of 100Mo to various excited final states of 100Ru was performed. Utilizing two large HPGe detectors operated in coincidence, a search for the subsequent deexcitation gamma-gamma cascades was conducted. A 1.05-kg sample of isotopically enriched (98.4%) 100Mo was investigated for 455 days, yielding an unambiguous observation of the double beta decay of 100Mo to the 01+ state (1130.3 keV) of 100Ru. This excited final state decays via the 01+ 21+ 0gs+ sequence (with Eγ1 = 590.8 keV and Eγ2 = 539.5 keV), and 22 such coincidence events were detected, with a continuous background estimated to be 2.5 events. This counting rate corresponds to a decay half-life for the ββ(0+ rightarrow 01+) transition of T1/2(0+2) = [ 6.0+1.9-1.1 (stat) 0.6(syst)] × 1020$ years. Lower limits on decay half-lives were achieved for higher excited final states.
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