DECAY OF 18.6-MIN 81GSE AND 57.3-MIN 81MSE

The rays following the decay of the Se81 isomers have been studied using Ge(Li) detectors and coincidence techniques. rays of 260.2, 492.4, and 767.3 keV were found to follow the decay of Se81m and rays of 178.3, 275.9, 290.1, 538.2, 552.4, 566.0, 649.8, and 827.3 keV to follow the decay of Se81g. Levels were established at 275.9, 536.1, 538.2, 566.0, 649.8, 767.3, and 828.3 keV. No evidence was observed for levels at 815 or 1146 keV nor was definite feeding observed to known levels at 836.4, 1122, and 1203 keV. The logft values are discussed and comparisons of the levels made with those of Br79 and Br83. © 1969 The American Physical Society.