Isovector dipole-resonance structure within the effective surface approximation

摘要

The nuclear isovector-dipole strength structure is analyzed in terms of themain and satellite (pygmy) peaks within the Fermi-liquid droplet model. Such astructure is sensitive to the value of the surface symmetry-energy constantobtained analytically for different Skyrme forces in the leptodermous effectivesurface approximation. Energies, sum rules and transition densities of the mainand satellite peaks for specific Skyrme forces are qualitatively in agreementwith the experimental data and other theoretical calculations.