Charge Exchange Spin-Dipole Excitations of 90Zr and 208Pb and Neutron Matter Equation of State
Abstract
Charge exchange spin-dipole (SD) excitations of 90Zr and 208Pb are studied by using a Skyrme Hartree-Fock(HF) + Random Phase approximation (RPA). The calculated spin-dipole strength distributions are compared with experimental data obtained by 90Zr (p,n) 90Nb and 90Zr (n,p) 90 Nb reactions. The model-independent SD sum rule values of various Skyrme interactions are studied in comparison with the experimental values in order to determine the neutron skin thickness of 90Zr. The pressure of the neutron matter equation of state (EOS) and the nuclear matter symmetry energy are discussed in terms of the neutron skin thickness and peak energies of SD strength distributions.
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