A model developed previously to treat p${+\mathrm{}}^4$He scattering at intermediate energies is applied to the case of p${+\mathrm{}}^3$He scattering. The scattering amplitude is written as a sum of direct and exchange terms. The direct-plus-knockout exchange terms are approximated by a phenomenological optical potential scattering amplitude. The heavy particle stripping term, representing the exchange of a neutron-proton cluster between projectile and target, is calculated using a modified distorted-wave Born approximation approach. The point-nucleon wave function for the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ target is determined from a fit to the charge form factor, after subtraction of recently calculated meson exchange current contributions. The back-angle rise in the differential cross section in the energy range 150–600 MeV is reproduced qualitatively when the heavy particle stripping term is included. In addition, a slight improvement in the large angle analyzing power is obtained at 300 and 515 MeV.

• Received 2 March 1987

DOI:https://doi.org/10.1103/PhysRevC.36.1900