ELASTIC  SCATTERING  OF  SLOW  POSITRONS  BY  ATOMS

M.Ya.Amusia*#, N.A.Cherepkov+ and L.V.Chernysheva*

*A.F.Ioffe Physico-Technical Institute, Russian Academy of Sciences,
194021 St.Petersburg, Russia
#The Racah Institute of Physics, Hebrew University, Jerusalem 91904,
Israel
+State University of Aerospace Instrumentation, 190000 St.Petersburg,
Russia

The elastic scattering cross section of slow positrons on some closed
shell and alkali atoms is calculated in the simplified version of the
random phase approximation with semi-quantitative account of the virtual

positronium formation. The results of calculations are compared with the

experimental measurements where available.