ELECTRON-SCATTERING FORM-FACTORS FOR THE GIANT-DIPOLE RESONANCE

Using a previously developed formalism based on the generator coordina te method, the longitudinal- and transverse-excitation form factors fo r the giant dipole resonance are obtained. Although microscopically es tablished, that approach can provide analytic and compact expressions for some selected closed-shell nuclei. Our calculations are then compa red with the phenomenological Goldhaber-Teller isospin-mode result and the experimental data. From our method, we derive restricted RPA resu lts (quadratic approximation) which are analysed.