This study explores the electric quadrupole and magnetic dipole moments of neutron-rich osmium isotopes ( 182–192 Os) using the Hartree–Fock–Bogoliubov (HFB) method within the nuclear density functional theory (DFT) framework. The SLy4 Skyrme interaction was employed, and calculations were performed using the HFODD and HFBRAD solvers. Theoretical results were benchmarked against experimental data from the IAEA/INDC nuclear moment databases. A systematic evolution in nuclear shape is observed from prolate (elongated) to oblate (flattened) deformation as neutron number increases, consistent with macroscopic–microscopic predictions. The HFB approach successfully captures the trend in even-even isotopes. However, for transitional and odd-mass nuclei, discrepancies emerge, largely due to the sensitivity of these systems to quasiparticle blocking configurations and time-odd components in the energy density functional, which are often poorly constrained. These results highlight the importance of pairing correlations and time-odd mean-field effects and point toward the need for beyond-mean-field methods to improve the description of odd-A and shape-coexisting systems.
Hasan et al. (2026) studied this question.