ENERGY-LOSS EFFECTS IN MULTIPLE-SCATTERING ANGULAR-DISTRIBUTIONS OF IONS IN MATTER

The standard theory of multiple scattering of ions traversing matter a ssumes that the energy loss of a particle, during transit through a me dium, is very small compared with its initial energy. Here we consider the effect of finite-energy losses on the multiple-scattering angular distributions, by taking into account the variation of the energy-dep endent scattering cross section as a function of the depth penetrated into the material. The theory is generalized to account for a continuo us slowing down of the beam particles. We study in particular, for the case of slow ions, the increased spread of the angular distributions due to the energy-loss effect.