Abstract
Energies and relative intensities of gamma transitions following the decay of 150 Pm were measured with Ge(Li) detectors and 94 gamma rays were observed. The half-life of 150 Pm was determined to be 161.9±0.9 min. Gamma-gamma coincidence and gamma-gamma anticoincidence measurements were performed. From these measurements the 1670 keV, 2371 keV and 2700 keV levels are proposed and the 2679 keV level is excluded. From beta-gamma coincidence measurements the beta-ray feeding to the ground state was found. By using a \(\sqrt{2}\pi\) beta-ray spectrometer, the beta-ray maximum energy of the transition to the first excited state was determined to be 3120±20 keV and the intensity ratio of the ground-state transition to this transition was 0.0858±0.0043. From gamma-gamma angular correlation measurements E2/M1 or M2/E1 mixing ratios of several gamma rays were obtained.
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