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.

4 pages. submitted to Phys. Rev. Lett

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• Overview of Neutron-Proton Pairing
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• Isospin-symmetry restoration within the nuclear density functional theory: formalism and applications
• Additivity of effective quadrupole moments and angular momentum alignments in the A~130 nuclei
• 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