The Role of Charge Changing Cross-Sections in Cosmic Ray Propagation

Variations of cosmic ray nuclear abundance at the top of the atmosphere is studied using different available partial cross-sections e.g. semi empirical formulations of Tsao et al., Garrard et al. and theoretical formulation of Wilson et al., based on the abrasion-ablation model. The Andersand Ebihara solar abundance is taken as a standard source spectrum in a Monte Carlo simulation of cosmic ray propagation through ISM. A Comparative study of the sub Fe/Fe ratios obtained using different cross-sections has been made.