Three-body model for an isoscalar spin-triplet neutron-proton pair in Sb102

Abstract : We discuss the effect of a neutron-proton pair in the T=0,S=1 channel in the low-lying states of the Sb102=Sn100+p+n nucleus. To this end, we construct a core+p+n three-body model with a model space based on Skyrme and relativistic mean-field calculations. The latter model is found to be more realistic for the present case due to the pseudospin symmetry. It turns out that the (L,S,T)=(0,1,0) coupling scheme of valence nucleons is strongly hindered in Sb102 with the relativistic model because of the near degeneracy of the g7/2 and d5/2 orbitals in the valence space. The effect of this neutron-proton coupling is clearly seen in the charge-exchange Gamow-Teller-type transitions rather than in the binding energies of T=0 and T=1 states.
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Submitted on : Monday, July 11, 2016 - 1:47:39 PM
Last modification on : Thursday, January 11, 2018 - 6:12:41 AM

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Y. Tanimura, H. Sagawa. Three-body model for an isoscalar spin-triplet neutron-proton pair in Sb102. Physical Review C, American Physical Society, 2016, 93 (6), pp.064319. ⟨10.1103/PhysRevC.93.064319⟩. ⟨in2p3-01344139⟩

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