Elastic scattering of positrons from hydrogen atoms with exponential cosine-screened Coulomb potentials

We have investigated the elastic scattering of positrons from the ground state of hydrogen atoms interacting with exponential cosine-screened Coulomb potential (ECSCP). A simple expression for partial-wave scattering amplitude, derived within the framework of the second-order distorted wave Born approximation, has been used to calculate the scattering parameters. A detailed study has been made on differential and total cross sections in the energy range 20-300 eV. To the best of our knowledge, this study on the differential and total cross sections for elastic positron-hydrogen collisions in ECSCP is reported for the first time.