Abstract
A calibrated silicon detector provided range-energy data for ${\mathrm{Cf}}^{252}$ fission fragments in ${\mathrm{H}}_{2}$, ${\mathrm{D}}_{2}$, ${\mathrm{N}}_{2}$ and Mylar. Bohr's classical stopping-power theory and Lindhard's more recent Thomas-Fermi model both underestimate the measured energy losses. For both theories, the discrepancy with experiment is a monotonic function of the atomic number of the stopping material, at least for the limited range of materials studied.
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