INTERMEDIATE-ENERGY TO HIGH-ENERGY POSITRONS SCATTERED BY ALKALI-METAL ATOMS

We present calculations of the differential, integrated elastic, and t otal cross sections for positrons scattered from alkali-metal atoms. T he energy of the positrons ranges from 10 eV to 1000 eV. In the calcul ations we use parameter-free model potentials for the correlation-pola rization and absorption interactions. The absorption potential used fo r positron scattering is based on a quasifree model that we recently p roposed and tested for the noble-gas targets. For positron-alkali-meta l scattering the model potentials have produced reliable scattering cr oss sections over the extended range of impact energies when compared against the available experimental data.