Range-Energy Relation and Energy Loss of Fission Fragments in Solids

The energies of fission fragments transmitted through Al, Ni, Ag, Au, and U-Pd have been measured with surface-barrier detectors. The results, converted to the Lindhard-Scharff-Schiott (LSS) dimensionless parameters $k\rho$ (range) and $\epsilon$ (energy), were found to fit the empirical equation $k\rho =1.158\mathrm{}{\epsilon }^{\frac{1}{2}}[1-\exp (0.0987\mathrm{}\epsilon \left)\right]+0.01939\mathrm{}\epsilon$ in the region $12\le \epsilon \le 348$. These results are 10-20% lower than those predicted by the LSS theory. A description is given of the effect of relatively simple modifications to this theory, and suggestions are presented for a more rigorous theoretical approach.