Transition densities and electroexcitation of nuclear dipole states

The transition densities for the 1-dipole excitations of spherical nuclei are calculated in the framework of self-consistent microscopic approach. It is found that in intermediate-mass and heavy nuclei the transition density for the giant-resonance states varies from volume oscillations to the surface shape with increasing the excitation energy. The deep volume oscillations are characteristic for the transition density of high-energy excitations. The form factors for the inelastic electron scattering were calculated in DWBA. It is shown that the variation of transition density affects essentially the calculated form factors. The volume transition density is the characteristic of the spectrum of nuclear excitation below the E1 resonance maximum. Volume oscillations of the transition density is characteristic of the high-energy region of the spectrum. It is found that the multipole analysis can't be used in considering the whole spectrum by means of one of the same transition density. The results obtained are consistent with the qualitative features of the giant dipole resonance in the droplet model