Abstract
The statistical distribution of the number of emitted electrons induced by MeV ${\mathrm{H}}^{+}$ and ${\mathrm{He}}^{2+}$ impact on aluminum, copper, and gold targets was measured. The obtained results are very well represented by a P\'olya distribution. Based on a simplified theoretical picture the appearance of a P\'olya distribution in this context can be explained by cascade processes, which permits a quantitative estimation of the distributions in good agreement with the experiments for all investigated projectile-target combinations. The deviation from a Poisson distribution is given by the relative importance of cascade processes compared to projectile-induced processes.
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