Application of the intermediate-coupling unified nuclear model to the odd-mass Ag isotopes

Abstract

In recent years a large amount of data has been accumulated on the characteristics of the excited states of Ag isotopes by the ~and v-ray spectroscopic studies (l-a), multiple Coulomb excitation experiments (4,5) and scattering experiments (6,7). In all these references the origin of the low-lying odd-parity states in l~176 have been qualitatively explained by assuming a simple model in which the 9 89 odd-particle state is weakly coupled to a doubly even vibrating core. In the observed spectra of l~ and l~ there are indications of Pt hole excitations (3,a). However, as yet no detailed calculations have been performed to check the validity of core-particle coupling model for these isotopes. The aim of the present studies is to investigate the properties of the odd-parity levels in x~176 using the intermediate-coupling approach of the unified model and then to compare the results with the experimental data. The formalism of the intermediate-coupling model has already been described in several places, e.g. see ref. (s,s). As usual the Hamiltonian is given by