Abstract
Double-beta decay from the ground state of 100 Mo to the 0 + excited state at 1130.29 keV in 100 Ru has been observed. A 956 g sample of molybdenum metal powder isotopically enriched to 98.468% 100 Mo was counted in a Marinelli geometry with a well-shielded, ultralow-background germanium detector. The cascade gamma-rays at 539.53 and 590.76 keV in 100 Ru were observed at the 99.998% confidence limit. The systematic errors have not yet been evaluated, but the data support a half-life of ∼10 21 y.
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