Single-particle quadrupole electromagnetic transitions in p-shell and sd-shell nuclei

Abstract

Electron scattering Coulomb form factors for the single-particle quadrupole transitions in p-shell and sd-shell nuclei have been studied. Core polarization effects are included through a microscopic theory that includes excitations from the core orbits up to higher orbits with 2ω excitations. The modified surface delta interaction is adopted as a residual interaction. The results are discussed for the ( 1p1/2-1↦1p3/2-1) proton transition in 15N, ( 1d5/2↦2s1/2) neutron transition in 17O and ( 1d3/2-1↦2s1/2-1) proton transition in 39K. The inclusion of core polarization effects modifies the form factors markedly and describes the experimental data very well in both the absolute strength and the momentum transfer dependence.