Range calculations at high ion energy-part I

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Abstract
An approximation method is developed for ion angular flux and range calculations in amorphous matter. The approximation is based on the smallness of probability of large energy transfer in ion-atom collisions. A numerical technique is presented for the solution of the approximate equations at high incident energy (above the electronic stopping power maximum). Numerical solutions are given for 100 MeV B ion in a Ni target and for proton and He ions in an Al target at different incident energies. The results are compared with calculations of the mean penetration depth and of the longitudinal straggling performed by the moment method and with experimental data, and good agreements are obtained.