Cross sections of 197Au at 10 A GeV and of 207Pb at 158 A GeV

Abstract

We have measured total and elemental charge changing cross sections fro the fragmentation of 10 AGeV 197Au- and 158 AgeV 207Pb-beams interacting with different targets (C, CH 2, Al, Cu, Ag, and Pb) using stacks of CR-39 and of BP-1 nuclear track detectors. Electromagnetic dissociation (ED) significantly contributes to these interactions besides nuclear fragmentation. Based on the factorization of elemental cross sections it is possible to separate electromagnetic dissociation cross sections from the measured data. The analysis of the Au 10 AGeV experiment is completed. For the Pb-beam the analysis is in progress. First results will be reported.