Quasifree Proton-Proton and Proton-Deuteron Scattering onHe3

Quasifree proton scattering from ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ is examined on the basis of available data. Cross sections are given in the pole-dominance approximation for either two protons or a proton and deuteron detected in coincidence. The cross sections are evaluated for a constant ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ vertex and a separable-potential model of the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ vertex amplitude. Both two- and three-body breakup of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ are considered, with final-state rescattering included between the spectator nucleons in three-body breakup. It is shown that the asymptotic form of the coordinate-space ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ wave function governs the shape of these low-momentum-transfer cross sections and that final-state rescattering between the spectator pair in ${}_{}{}^3{}_{}{}^{}\mathrm{He}\mathrm{}(p,2p)\mathrm{pn}$ mainly affects the magnitude of this cross section.