Total Charge-Changing And Partial Cross-Section Measurements In The Reactions Of Similar To 110-250 Mev/Nucleon C-12 In Carbon, Paraffin, And Water

Total charge-changing cross sections and cross sections for the production of B and Be fragments were directly measured for reactions induced by similar to110-250 MeV/nucleon C-12 ions in C, CH2, and H2O targets. Etched track detector (CR-3) was used, together with an automatic track measuring system and a track matching algorithm, to count and to identify the primary and secondary particles. A comparison of the present data and of previously measured cross sections with model predictions is carried out. For the total charge-changing cross section, a model developed at NASA gives the best agreement with the present results (about 3% on the average). However, for the production of fragments, the results of models deviate on average for all systems studied by 9-58 % from the data presented in this work for Z=5 and by 5-47 % for Z=4. The model known as NUCFRG2 is the most reliable in giving the closest values for fragmentation cross sections, 9 and 5% for B and Be fragments, respectively, for the systems studied in this work.