The electroexcitation of 32S in the region of the dipole resonance

Abstract

The C1 + E1 and M2 form factors for inelastic scattering of high-energy electrons by 32S in the region of the dipole giant resonance have been calculated. The used wave functions of excited states were obtained in terms of a microscopic “particle-hole” approach of the shell model taking into account the configurational splitting and coupling of the particle-hole excitations to one- and two-phonon states. A reasonable fit with the experimental data of Afanasyev and coworkers for the 32S excitation curve at different momentum transfers q ≦ 1 fm ≈1 was obtained though the agreement of theγ-quanta absorption cross sections and the (γ, n) reaction with the experiment is not satisfactory. It is emphasized that the cross sections (γ, γ), (γ, Po) and (p, γo), the photonucleon spectra and the transverse electron scattering form factors are particularly sensitive to the configurational composition of wave functions in different regions of the 32S excitation curve.