Abstract
Shell model calculations are carried out for the spectra of nuclei with in the model space in which the valence protons occupy the and orbitals, and valence neutrons occupy and orbitals using a partition truncation method. We first select partitions that are big enough to describe the spectra of nuclei with Then we combine all possible valence neutron partitions with the selected valence proton partitions of the corresponding nuclei with to diagonalize the Hamiltonians for the nuclei with The weak-coupling scheme is used to analyze the experimental data and the calculated results. The concepts of independent nucleon-pair motion in even-even nuclei and the homologous state structure in even-odd nuclei are held in this mass region. The spectra of and share a special similar structure; i.e., the low-lying states of up to 2.5 MeV can be obtained by replacing the last odd proton in and vice versa.
- Received 14 December 1998
DOI:https://doi.org/10.1103/PhysRevC.60.054316
©1999 American Physical Society