# 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.
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http://hal.in2p3.fr/in2p3-00578172
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Submitted on : Friday, March 18, 2011 - 3:18:11 PM
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Long-term archiving on: : Sunday, June 19, 2011 - 2:44:48 AM

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### Citation

S. Zerguine, P. van Isacker. Spin-aligned neutron-proton pairs in $N=Z$ nuclei. Physical Review C, American Physical Society, 2011, 83, pp.064314. ⟨10.1103/PhysRevC.83.064314⟩. ⟨in2p3-00578172⟩

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