Consequences of omitting spin-orbit partner configurations for B(E2) values and quadrupole moments in nuclei

Shell-model calculations of B(E2)'s and quadrupole moments in the even-even nuclei in the g9/2 shell region below Sn100 are hampered by the fact that the inclusion of the g7/2 configuration will lead to model spaces that are too large to handle. Understanding the impact of specific orbit wave functions in large-scale shell-model (LSSM) calculations helps to shed light on the validity of the results that are obtained. We therefore examine lighter nuclei in the beginning of the fp region where one can normally include all the orbitals, f7/2,p3/2,p1/2, and f5/2, for both protons and neutrons. We perform such calculations but then take a step back and exclude the f5/2 orbital. By comparing the results of the two calculations we can hope to get insight into the importance of the missing spin-orbital partner in other regions.