Ps - He scattering using a static-exchange model

Abstract

The static-exchange model has been employed to investigate Ps - He atom scattering at low and intermediate energies using Hylleraas and Hartree - Fock wavefunctions for the He atom. The total elastic cross sections and s-, p- and d-wave phase shifts are reported and our present phase shifts are compared with those existing predictions. The effect of electron exchange is found to be significant at low and medium energies and the scattering parameters are found to be sensitive to the choice of wavefunction.