Abstract
Theβ-decays of172–175Ir have been studied using a Hejet system through32S induced reactions,β half-lives have been measured and compared with those given fromα decays. The level schemes of osmium nuclei are deduced and for172Os and174Os, the 22 + level is possibly located. The observedβ-decay half-lives clearly indicate an isomerism phenomenon occuring in light Ir isotopes.
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The authors wish to thank Dr. I.N. Isosimov and Dr. I.V. Shirokovsky (JINR Dubna) for their help and fruitful suggestions during part of experiments carried out in the framework of the DUBNA-IN2P3 collaboration.