Abstract
Nuclear structure of 181 Os was investigated by in-beam gamma ray spectroscopy through the excitation function and beam-gamma timing measurements. The low-lying level scheme of 181 Os was proposed and the half-life of the first excited state was obtained to be 316±18 ns. The dependence of the intensity ratio of the crossover to cascade transitions on the Nilsson orbit is discussed by taking into account the cancellation of g-factor. The hindrance factor of the E1 transition between the first excited state (9/2+[624]) and the ground state (7/2-[514]) was estimated to be 3.7×10 2 in terms of the Nilsson estimate.
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