Total charge-changing and partial cross-section measurements in the reaction of 110 MeV/u 12C with paraffin

We have measured the total and partial charge-changing cross-sections (Z = 5) after the passage of a 110 MeV/u C-12 beam through an assembly consisting of CR-39 thin detectors and paraffin targets. These experimental cross-sections were compared to the predictions of known models. It was found that the measured total cross-sections agree with the model calculations to within about 8% or even less, while, depending on a model, discrepancies of up to a factor 1.2 higher and up to a factor 2.7 lower values of cross-sections for the production of fragment with Z = 5 were observed. (C) 2001 Elsevier Science Ltd. All rights reserved.