Total charge-changing cross sections and cross sections for the production of B and Be fragments were directly measured for reactions induced by $\sim 110–250\hspace{0.5em}\mathrm{M}\mathrm{e}\mathrm{V}/\mathrm{n}\mathrm{u}\mathrm{c}\mathrm{l}\mathrm{e}\mathrm{o}\mathrm{n}{\hspace{0.5em}}^{12}\mathrm{C}$ ions in C, ${\mathrm{CH}}_2,$ and ${\mathrm{H}}_2\mathrm{O}$ 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 $Z=5\mathrm{}$ and by 5–47 % for $Z=4.\mathrm{}$ 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.

• Received 26 February 2002

DOI:https://doi.org/10.1103/PhysRevC.66.014609