Spin-aligned neutron-proton pairs in $N=Z$ nuclei

Abstract

A study is carried out of the role of the aligned neutron-proton pair with angular momentum J=9 and isospin T=0 in the low-energy spectroscopy of the $N=Z$ nuclei ${}^{96}$Cd, ${}^{94}$Ag, and ${}^{92}$Pd. Shell-model wave functions resulting from realistic interactions are analyzed in terms of a variety of two-nucleon pairs corresponding to different choices of their coupled angular momentum $J$ and isospin $T$. The analysis is performed exactly for four holes (${}^{96}$Cd) and carried further for six and eight holes (${}^{94}$Ag and ${}^{92}$Pd) by means of a mapping to an appropriate version of the interacting boson model. The study allows the identification of the strengths and deficiencies of the aligned-pair approximation.

5 figures, 7 tables, accepted for publication in Physical Review C

References in corpus (3)

• Nuclear magic numbers: new features far from stability
• Evidence for a spin-aligned neutron-proton paired phase from the level structure of ${}^{92}$Pd
• Solvability of eigenvalues in jn configurations

Cited by in corpus (20)

• Overview of Neutron-Proton Pairing
• Nilsson-SU3 selfconsistency in heavy N=Z nuclei
• Shape coexistence in even-even nuclei: A theoretical overview
• Multistep shell model description of spin-aligned neutron-proton pair coupling
• $N=Z$ nuclei: A laboratory for neutron-proton collective mode
• g9/2 nuclei and neutron-proton interaction
• Neutron-proton pairs in nuclei
• Odd- J Pairing in Nuclei
• Importance of static quadrupole moments for determining collective aspects of nuclear structure: N=Z calculations with four and eight valence particles
• Deformation effects on the coexistence between neutron-proton and particle like pairing in N=Z medium mass nuclei
• Symplectic group structure of the 48Cr, 88Ru, and 92Pd ground states
• Cooperation of anti-aligning and aligning shell-model forces for N=Z
• Coherence features of the spin-aligned neutron-proton pair coupling scheme
• Proton and neutron correlations in ${}^{10}$B
• High-spin structure in ${}^{40}$K
• Generic features of the neutron-proton interaction
• Aligned neutron--proton pairs in $N\sim Z$ nuclei
• Symmetries in the \bm{g_{9/2}} shell
• Partial conservation of seniority in semi-magic nuclei
• Boson Models with Interactions of Arbitrary Order