Quasiparticle phonon model description of low-energy states in Pr152

Abstract

Delayed $\ensuremath{\gamma}$-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 $^{152}\mathrm{Pr}$. 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 $(\ensuremath{\pi}3/2[422]\ensuremath{\bigotimes}\ensuremath{\nu}5/2[642]){1}^{+}$ for the isomer and $(\ensuremath{\pi}3/2[541]\ensuremath{\bigotimes}\ensuremath{\nu}3/2[521]){3}^{+}$ for the ground state.