Quasiparticle phonon model description of low-energy states in Pr-152

Abstract

Delayed gamma-ray and conversion-electron spectroscopy is performed on A = 152 fission fragments, at the Lohengrin spectrometer of the Institut Laue-Langevin, providing a new decay scheme for Pr-152. The quasiparticle phonon model, combined with the particle-rotor model, which allows octupole correlations and Coriolis mixing to be taken into account, is applied to analyze its low-energy structure. The main configurations are found to be (pi 3/2[422] circle times nu 5/2[642])1(+) for the isomer and (pi 3/2[541] circle times nu 3/2[521])3(+) for the ground state.