ELASTIC POSITRON SCATTERING FROM KRYPTON AND XENON IN THE RELATIVISTIC POLARIZED ORBITAL APPROXIMATION

We present results of ab initio relativistic calculations on the elast ic positron scattering from Kr and Xe atoms in the energy region below 10 eV. The approach employed ws the relativistic polarized orbital ap proximation in which we tried to keep correctly orders of various cont ributions to positron-atom interaction potentials. In view of the seri ous disagreement between the present results and experimental data we conclude that the polarized orbital approximation, even in its relativ istic version, is not able to provide reliable values of positron scat tering cross-sections.