Speaker
Description
Density functionals based on density functional theory have been widely applied to nuclei over a broad mass range within self-consistent mean-field approaches. A hybrid approach combining density functionals with the shell-model framework has been developed, in which configuration mixing is explicitly incorporated. Although this approach successfully reproduces various observables of the $sd$-shell and $pf$-shell nuclei, it fails to describe the low-lying energy spectra of some nuclei with neutron magic numbers. This deficiency is likely attributed to the large shell gaps at the magic numbers and to the weak contributions from cross-shell correlations. Since spin-dependent forces, such spin-orbit and tensor forces, play a crucial role in the evolution of shell gaps, modifying their strengths is expected to enhance cross-shell correlations and then improve the description of nuclear structure.
In this presentation, we investigate how the calculated results are improved by varying the spin–dependent parameters of the Gogny-D1S, Gogny-GT2, M3Y-P6 interactions.