Multipole mixing ratios of electromagnetic transitions in 152Sm

Using gamma gamma ( theta ) and eK gamma ( theta ) directional correlation techniques, the authors have determined: (a) the multipole character of some transitions connecting the quadrupole and octupole vibrational bands to the ground state rotational band in 152Sm following the decay of 152Eu; and (b) the K-shell particle parameter of the 121.8 keV transition which de-excites the lowest energy level of the same nucleus. The results show that transitions from the beta and gamma vibrational bands are predominantly E2, with a large E0 admixture in the former case, while such a contribution is almost absent in the transition from the gamma band. These results are compared with Kumar's theoretical predictions and with previously reported experimental values. The investigation on the 121.8 keV K-shell particle parameter yields a value which is smaller than theoretically predicted by (8.5+or-2.1)%.