Abstract

The excited level scheme of189Os as populated by the decay of 23.4-h189Re has been studied by use of Ge(Li) and Si(Li) detectors in the γ-ray singles and coincidence mode. The data confirm the presence of excited levels in189Os at 30.8 (Jπ=9/2−), 36.2 (1/2−), 69.5 (5/2−), 95.2 (3/2−), 216.7 (7/2−), 219.4 (7/2−), 233.6 (3/2−), 275.8 (5/2−), 496.8 (1/2−, 3/2+) and 599.8 (1/2−, 3/2+) keV. The spin and parity assignments are based on multipolarities determined by internal conversion coefficient measurements and decay systematics. A decay scheme is established for189Re which accommodates 98% of the electromagnetic transition intensity. No evidence for the 150-d189Re isomer was found in this study.

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