Energy levels and γ-ray transitions in 147Pm

Gamma rays emitted in the decay of 147Nd have been studied using Ge(Li) detectors as singles and coincidence spectrometers. Four new γ-rays of 53.1, 81.15, 149.4 and 191.24 keV have been detected and all incorporated into the decay scheme. Angular correlation measurements for the 275-319, 275-411 and 272-408 keV cascades have yielded the following result: A2(275-319) = 0.006(2), A4(275-319) = 0.005(5), A2(275-411) = -0.013(17), A4(275-411) = -0.008(30), A2(272-408) = -0.283(10) and A4(272-408) = 0.015(18). From these coefficients the E2/M1 mixing ratios of the 272 and 275 keV γ-transitions have been determined to be 0.10(3) and 0.107(7), respectively, and the spin of the 680.43 keV level to be 7/2. Theoretical calculations on the intermediate coupling model for harmonic and anharmonic potential functions have been carried out and better agreement with experiment has been obtained for the anharmonic potential functions. (Auth.)