A QUASI-FREE MODEL FOR THE ABSORPTION EFFECTS IN POSITRON SCATTERING BY ATOMS

We present a model absorption potential for the calculation of cross s ections for the scattering of positrons from various atomic targets. O ur model, which is free of any adjustable parameters, is analogous to the quasifree scattering model which has been used by other investigat ors for the scattering of electrons from rare gases. As a test of the proposed model we use it to calculate total and differential cross sec tions for positrons scattered from various rare gas targets.