Quasiparticle-phonon model and quadrupole mixed-symmetry states of⁹⁶Ru

Abstract

Abstract. The structure of low-lying quadrupole states of 96 Ru was calculated within the Quasiparticle-Phonon Model. It is shown that symmetric and mixed-symmetry properties manifest themselves via the structure of the excited states. The first 2 + state is collective and neutron and proton transition matrix elements M n and M p are in-phase, while the neutron and proton transition matrix elements M n and M p have opposite signs for the third 2 + state. This property of the third 2 + state leads to a large M1 transition between the first and third 2 + states. It is an unambigous demonstration of the mixed-symmetry nature of the third 2 + state. The structure of the first 1 + state is calculated. The state is a member of the two-phonon multiplet generated by the coupling of the