Internal conversion studies in the decay of84mRb

Abstract

The relative gamma intensities of the 216, 248 and 464 keV transitions in the decay of 84mRb were determined. The K-conversion coefficients of the 216 and 248 keV transitions were obtained as 0.74(4) and 0.033(3), respectively, using coincidence methods. These values of alpha K are consistent with assigning the 248 keV transition as pure E2 and the 216 keV transition as M3+E4. From the relative gamma intensities of the 216-248 keV cascade, the total conversion coefficient of the 216 keV transition was evaluated as 0.93(6), assuming that alpha T for the 248 keV transition was 0.038(3). The average adopted values of the M3 and E4 contributions to the 216 keV transition were obtained a 0.58(9) and 0.42(9), respectively. The transition probability for the 248 keV transition showed an E2 enhancement of 86(17) over the Weisskopf estimate. In addition, the reduced transition probability of this transition was found to be of the same order of magnitude as the 2+ to 0+ transitions in the neighbouring even-even nuclei, suggesting the possibility of core excitation in 84Rb.