Quenching factor of Gamow-Teller and spin dipole giant resonances

Abstract

Gamow-Teller (GT) and spin-dipole (SD) strength distributions of four doubly magic nuclei ${}^{48}$Ca, ${}^{90}$Zr, ${}^{132}$Sn and ${}^{208}$Pb are studied by the self-consistent Hartree-Fock plus random phase approximation (RPA) method. The Skyrme forces SAMi and SAMi-T without/with tensor interactions are adopted in our calculations. The calculated strengths are compared with available experimental data. The RPA results of GT and SD strengths of all four nuclei show fine agreement with observed GT and SD resonances in energy. A small GT peak below the main GT resonance is better described by the Skyrme interaction SAMi-T with the tensor terms. The quenching factors for GT and SD are extracted from the comparisons between RPA results and experimental strengths. It is pointed out that the quenching effect on experimental SD peaks is somewhat modest compared with that on GT peaks in the four nuclei.

7 pages, 8 figures, published in PRC

References in corpus (5)

• Current Status of r-Process Nucleosynthesis
• A new Skyrme interaction with improved spin-isospin properties
• Neutrino Nucleus Reactions based on New Shell Model Hamiltonians
• Neutron Skin Thickness of 90Zr Determined By Charge Exchange Reactions
• Charge Exchange Spin-Dipole Excitations of 90Zr and 208Pb and Neutron Matter Equation of State

Cited by in corpus (3)

• Quenching of Gamow-Teller strengths and two particle -- two hole configurations
• New quantification of symmetry energy from neutron skin thicknesses of ${}^{48}$Ca and ${}^{208}$Pb
• Recent applications of the subtracted second RPA method