Backscattering coefficients for low energy positrons and electrons impinging on bulk solid targets

The backscattering coefficients (BSCs) for semi-infinite solids of normally incident 1-4 keV electrons and positrons are stochastically modeled and calculated by the Monte Carlo method. This paper aims at discussing the differences observed between the properties of electrons and positrons impinging on solid targets based on the use of the differential elastic scattering cross-section which has been obtained using the Bentabet and Bouarissa approximation (2006 Phys. Lett. A 355 390). A new mathematical equation was developed for the adjustable parameter β of the Bentabet et al approximation and seems to be valid for other elements. Both electron and positron BSC simulated results show good agreement with the experimental or computed data reported by other authors.