Abstract
Theoretical results for differential cross sections for the elastic scattering of electrons and positrons from xenon atoms are presented. For electrons two full relativistic calculations are shown where exchange effects are treated (i) by completely antisymmetrised wavefunctions and (ii) by an approximate local exchange potential; for positrons full and semi-relativistic results are compared. In general the agreement between the different approaches is quite satisfactory, however, the inclusion of a complex absorption potential further improves significantly the agreement with the available experimental data. Furthermore a simple semiclassical model for the local minimum in the differential cross section for positrons at small scattering angles is proposed.
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