High-spin intruder states in the fp shell nuclei and isoscalar proton-neutron correlations

Abstract

We perform a systematic shell-model and mean-field study of fully-aligned, high-spin f_{7/2}^{n} seniority isomers and d_{3/2}^{-1} f_{7/2}^{n+1} intruder states in the A~44 nuclei from the lower-fp shell. The shell-model calculations are performed in the full sdfp configuration space allowing 1p-1h cross-shell excitations. The self-consistent mean-field calculations are based on the Hartree-Fock approach with the Skyrme energy density functional that reproduces empirical Landau parameters. While there is a nice agreement between experimental and theoretical relative energies of fully-aligned states in N>Z nuclei, this is no longer the case for the N=Z systems. The remaining deviation from the data is attributed to the isoscalar proton-neutron correlations. It is also demonstrated that the Coulomb corrections at high spins noticeably depend on the choice of the energy density functional.

arXiv comment4 pages. submitted to Phys. Rev. Lett

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• Shell Model and Mean-Field Description of Band Termination
• Contradicting effective mass scalings within the Skyrme energy density functional method
• Isoscalar and isovector neutron-proton pairing
• Probing effective nucleon-nucleon interaction at band termination