Matter distribution and spin-orbit force in spherical nuclei

Abstract

We investigate the possibility that some nuclei show density distributions with a depletion in the center, a semi-bubble structure, by using a Hartree-Fock plus Bardeen-Cooper-Schrieffer approach. We separately study the proton, neutron and matter distributions in 37 spherical nuclei mainly in the $s-d$ shell region. We found a relation between the semi-bubble structure and the energy splitting of spin-orbit partner single particle levels. The presence of semi-bubble structure reduces this splitting, and we study its consequences on the excitation spectrum of the nuclei under investigation by using a quasi-particle random-phase-approximation approach. The excitation energies of the low-lying $4^{+}$ states can be related to the presence of semi-bubble structure in nuclei.

15 pages, 7 tables, 11 figures. Version accepted for publication in Phys. Rev. C; the number of nuclei analysed has been reduced; some figure have bee redrawn, and a new figure and some references have been added

References in corpus (8)

• A proton density bubble in the doubly magic ${}^{34}$Si nucleus
• Ab initio calculation of the potential bubble nucleus ${}^{34}$Si
• Detecting bubbles in exotic nuclei
• Central depression in nucleonic densities: Trend analysis in nuclear density-functional-theory approach
• Tensor effective interaction in self-consistent Random Phase Approximation calculations
• Beyond-mean-field study of the possible "bubble" structure of 34Si
• Spin-orbit splittings of neutron states in $N=20$ isotones from covariant density functionals and their extensions
• Pairing in spherical nuclei: quasi-particle random phase approximation calculations with the Gogny interaction

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• Shell closure at $N=34$ and the ${}^{48}$Si nucleus