Microscopic description of excitation of nuclear isoscalar giant resonances by inelastic scattering of 240 MeV alpha particles - art. no. 034312

A microscopic description of the excitation of isoscalar giant monopole res onance (ISGMR) and quadrupole resonance (ISGQR) in Si-28, Ca-40, Ni-58, and Sn-116 by 240 MeV bombarding energy alpha particles is provided based on s elf-consistent Hartree-Fock- (HF-) random-phase-approximation (RPA) approac h and the distorted-wave Born approximation (DWBA). The folding model is us ed to obtain optical potentials from the HF ground-state density and a dens ity dependent Gaussian nucleon-alpha interaction (V-alpha n). The parameter s of V-alpha n are determined by fitting experimentally measured angular di stributions for the case of elastic scattering. Angular distributions of in elastically scattered alpha particles for ISGMR and ISGQR excitations of th e target nucleus are obtained using the folding model DWBA and both microsc opic (RPA) and hydrodynamical (collective model) transition densities (foun d from HF ground state densities). A possible overestimation of the energy weighted sum rules and shifts of centroid energies due to the collective-mo del-based DWBA reaction description is reported.