Shell gaps and pn pairing interaction in N = Z nuclei
arXiv:0811.4093 · doi:10.1016/j.physletb.2008.11.072
Abstract
We analyze the observed shell gaps in N=Z nuclei determined from the binding energy differences. It is found that the shell gaps can be described by the combined contributions from the single-particle level spacing, the like-nucleon pairing, and the proton-neutron pairing interaction. This conclusion is consistent with that of Chasman in Phys. Rev. Lett. 99 (2007) 082501. For the double-closed shell N=Z nuclei, the single-particle level spacings calculated with Woods-Saxon potential are very close to those obtained by subtracting the nn pairing interaction from the observed shell gap. For the sub-closed or non-closed shell N=Z nuclei, the pn pairing interaction is shown to be important for the observed shell gaps.
9 pages, 5 figures
References in corpus (12)
- The realistic collective nuclear Hamiltonian
- Odd-Even Staggering of Nuclear Masses: Pairing or Shape Effect?
- Pairing correlations. Part 2: Microscopic analysis of odd-even mass staggering in nuclei
- Spin-orbit and tensor mean-field effects on spin-orbit splitting including self-consistent core polarizations
- Odd-even staggering of binding energies as a consequence of pairing and mean-field effects
- Microscopic structure of fundamental excitations in N=Z nuclei
- Rotations in isospace: a doorway to the understanding of neutron-proton superfluidity in N=Z nuclei
- Quadrupole and octupole softness in the N=Z nucleus 64Ge
- Improvement of the extended P+QQ interaction by modifying the monopole field
- Proton-neutron interactions in N \approx Z nuclei
- Competition between isoscalar and isovector pairing correlations in N=Z nuclei
- Global features of proton-neutron interactions and symmetry energy