Generalized neutron particle-hole states in an extended unified model

Abstract

Negative-parity levels in the doubly even N = 82, Z nuclei, with 3.0 MeV Ex 6.0 MeV are described in an extended unified-model approach, where neutron hole states in the Z = 50, N = 82 closed shell core, (i.e. ) are coupled to the low-lying levels (Ex 2.0 MeV) of the odd-neutron N = 83, Z nuclei. This particular configuration space of generalized neutron particle-hole states (GNPH) is particularly suited for describing negative-parity levels obtained in proton inelastic scattering through isobaric analogue resonances (IAR), corresponding to the N = 83, Z low-lying nuclear levels. Level schemes as well as partial decay widths and angular distributions are calculated and compared extensively with the available experimental data. Also spectroscopic factors, as well as wave functions, deduced from the experimental results are studied in detail. Thus in the cases of 136Xe, 138Ba, 140Ce, 142Nd and 144Sm, some of the important neutron particle-hole configurations can uniquely be determined in the energy region 3.0 MeV Ex 6.0 MeV.