Abstract
Abstract Negative-parity levels in the doubly even N = 82, Z nuclei, with 3.0 MeV ⪅ E x ⪅ 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. 2 d 3 2 −1 ,3 s S 1 2 −1 ,2 d 5 2 −1 ,1 g 7 2 −1 ) are coupled to the low-lying levels ( E x ⪅ 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 136 Xe, 138 Ba, 140 Ce, 142 Nd and 144 Sm, some of the important neutron particle-hole configurations can uniquely be determined in the energy region 3.0 MeV ⪅ E x ⪅ 6.0 MeV.
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