Analysis of Energy-Loss Data for 0.2-0.5 MeV/amup,α, andNin Se

Abstract

The analysis of experimental energy-loss data for 0.2-0.5 MeV/amu $p$, $\alpha$, and $N$ in Se has been made to obtain certain quantities. Data of standard media are also shown for comparison. The results tell us that the effective-charge parameter for $N$ is quite different from unity. The variation of the relative mean excitation energy measured by $\alpha$ particles is not linear in terms of $Z_2$. The parameter $\xi$ for $N$ is slightly larger than the theoretical value ($Z_1^{\frac{1}{6}}$). The electronic stopping cross section for $N$, which lies between two theoretical values, is not exactly proportional to the projectile velocity, suggesting that nitrogen as a projectile shows a peculiar behavior particularly unlike other light-heavy ions.