ELASTIC SCATTERING OF SLOW POSITRONS ON ATOMS
Amusia M.Ya., Cherepkov N.A., Chernysheva L.V.

Received: August 19, 2002

PACS: 34.50.Fa, 34.80.Dp, 34.10.+x, 34.85.+x

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The results of calculations of the elastic scattering cross section of positrons on noble gas and alkali atoms are presented. The calculations are performed within the one-electron Hartree-Fock approximation with multi-electron correlations in the so-called random phase approximation with exchange taken into account. Virtual positronium formation is taken into account and proved to be very important. Arguments are presented that the positron polarization potential is repulsive for alkali atoms. The results obtained are in a reasonable agreement with experiment and with some previously reported calculations.