Various scattering cross sections such as differential, integrated-elastic, momentum-transfer, and total cross sections, and the spin-polarization parameters for both the elastic and the total scatterings of electrons and positrons from cadmium atoms in the impact-energy range of 6.4–300 eV, have been calculated relativistically by solving the Dirac equation. For the pure elastic-scattering case, the projectile-target interaction is represented by a real model potential that includes the static potential (attractive), a parameter-free polarization potential (attractive) and an electron-exchange potential for the electrons scattering, and the static potential (repulsive) and a parameter-free polarization potential (attractive) different from that of electrons scattering for the positrons scattering from cadmium. For the total scattering, which includes both the elastic-scattering and the inelastic-scattering processes, the total interaction is represented by a complex potential by adding a model absorption potential as its imaginary part. It has been observed that the agreement of the calculated differential cross section (DCS) curves for the elastic scattering of electrons from cadmium is reasonable with the previously measured values of DCS while the agreement is good with the recently measured values of DCS.

• Received 17 October 1990

DOI:https://doi.org/10.1103/PhysRevA.43.2223