Effective charge parametrization in Bethe-Bloch theory of stopping powers of solid targets for heavy ions

A recent study by the author of effective charge parameterization of electronic stopping powers for heavy ions has indicated a necessity for two such parameters. The behavior of each of the selected parameters as a function of projectile atomic number (z) for a fixed target atomic number (Z) suggests structure, with a dominant maximum occurring near z = 14 and a lesser maximum appearing near z = 26 in the cases of C, Al, and Cu targets. This trend is not apparent for the case of Ag targets, however. The consequence of this structure on the effective charge is investigated. The results are related to those of previous studies of z-oscillations in the stopping power of a given target. Conjectural interpretation of parameter structure in terms of atomic shell configurations is advanced. 9 refs., 17 figs