Abstract

The stopping power for hydrogen- and heliumlike heavy ions penetrating matter at energies of 100–1000 MeV/u is calculated. For hydrogenlike ions the difference in d E/d x for an extended and a collapsed electron distribution is at the level of 1% and nonperturbative effects easily account for half of the difference. Differences of this magnitude have drastic effects on charge-exchange straggling. The theoretical results lead to good agreement with experimental values when applied in simulations.

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