Abstract
The magic nature of the nucleus is investigated in light of recent experimental results. We employ both Hartree-Fock-Bogoliubov and Hartree-Fock (HF)+BCS methods using Skyrme-type SLy5, SLy5+T, and T44 interactions. The evolution of the single-particle spectra is studied for the isotones: , , , and . An increase is obtained in the neutron spin-orbit splittings of and states due to the effect of the tensor force which also makes a magic nucleus candidate. Quasiparticle random-phase approximation calculations on top of HF+BCS are performed to investigate the first states of the calcium isotopic chain. A good agreement for excitation energies is obtained when we include the tensor force in the mean-field part of the calculations. The first states indicate a subshell closure for both and nuclei. We confirm that the tensor part of the interaction is quite essential in explaining the neutron subshell closure in and nuclei.
- Received 2 April 2014
DOI:https://doi.org/10.1103/PhysRevC.89.064322
©2014 American Physical Society