Role of T=0 pairing in Gamow-Teller states in N=Z nuclei

Abstract

Gamow-Teller (GT) states in N=Z nuclei with the mass number A from 48 to 64 are studied by using Hartree-Fock-Bogoliubov + quasi-particle random phase approximation (HFB+QRPA) with Skyrme interactions. The isoscalar spin-triplet (T=0,S=1) pairing interaction is taken into account in QRPA calculations. It is found in the context of SU(4) symmetry in the spin-isospin space that the GT strength of lower energy excitations is largely enhanced by the T=0 pairing interaction which works cooperatively with the T=1 pairing interaction in the ground state. A two-peaked structure observed recently in $(p,n)$ reaction on ${}^{56}$Ni can be considered as a manifestation of the role of T=0 pairing in the GT collective states.

5 pages, 3 figures

References in corpus (5)

• BCS-BEC crossover of neutron pairs in symmetric and asymmetric nuclear matter
• Effective pairing interactions with isospin density dependence
• The Gamow-Teller response within Skyrme random-phase approximation plus particle-vibration coupling
• Spin-isospin nuclear response using the existing microscopic Skyrme functionals
• T=0 effective interaction in 14N and 10B

Cited by in corpus (25)

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