Full-fledged shell-model calculations have been performed for neutron-rich Se, As, Ge, and Ga isotopes using a valence space made up from nucleons occupying the $g_{9/2},p_{1/2},p_{3/2}$, and $f_{5/2}$ orbitals. The calculated energies and electromagnetic transitions are compared with the experimental data which is available on these nuclei. Pair-truncated shell model calculations have also been carried out to investigate the structure of the high-spin states, with particular focus on the effect of the alignment of neutrons in the $g_{9/2}$ orbital.

• Received 17 June 2008

DOI:https://doi.org/10.1103/PhysRevC.78.044320