Allowance for multiple scattering in proton energy spectra

The energy spectra of 6.3 MeV energy protons backscattered by a thick Au target are studied experimentally for a broad range of varying backscattering angle. It has been shown in what manner the deviations of the forms of the energy spectra from the spectral forms calculated in the single-scattering approximation increase with decreasing scattering angle. It has been shown also that at not too high proton energy loss in the target the deviations may be described by a correction function which takes into account the contribution to the energy spectra of multiple particle scattering in the target.