Systematic Compilation/Evaluation of Reduced B(E3) Transition Probabilities and Configurations of Octupole (∆I=3) Isomers in Mass A~200 Region

Abstract

Background: Strong octupole correlations are observed in mass  region giving rise to a number of isomeric states decaying via  type of transition involving  interacting orbitals. Theoretically, the  and  neutron orbitals or the  and  proton orbitals are predicted to be involved in these enhanced  decays. Purpose: This work reports on the systematics of reduced transition probabilities and configurations of octupole isomers in order to compare them based on their structures such as even-even, even-odd, odd-even and odd-odd. Methods: The data for a total of  isomers is collected from the ENSDF/XUNDL Database of NNDC. The reduced  transition probabilities are evaluated and compiled using the available data on half-life and branching ratios of the isomeric states having pure  decay. In about  cases, we have also evaluated the half-lives to get their adopted value to obtain the  transition probability by RULER program. Results:  A systematic variation in the reduced  transition strength is discussed as a function of neutron and proton number to see the contribution/effect from the core particles. An enhancement is observed experimentally for the isomeric states involving the  and  neutron orbitals or the  and  proton orbitals Conclusions: The enhanced  transitions rates are observed in nuclei having configurations with octupole effects.