STUDY OF Ir191m

Abstract
Using the McGill 100-Mev proton synchro-cyclotron, the half-life of Ir191m has been redetermined and the value 4.53 ± 0.18 s obtained from 55 trials. The mass assignment is here based on the study of the excitation curves for both osmium and iridium targets. The measured αk = 2.0 ± 0.3 for the observed 126 ± 6 kev gamma ray is consistent with the M1 + E2 assignment previously made. No 42-kev gamma ray could be detected.
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