Cross sections for the production ofC11in C targets byNe20andFe56at relativistic energies

Cross sections for the reactions ${}_{}{}^{12}{}_{}{}^{}\mathrm{Ne}$,X${)\mathrm{}}^{11}$C and ${}_{}{}^{12}{}_{}{}^{}\mathrm{Fe}$,X${)\mathrm{}}^{11}$C were measured using 1.05 GeV/nucleon ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ and 1.7 GeV/nucleon ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}$ ions. Annihilation radiation from ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ was counted using a large volume NaI(Tl) detector. Values of 80.4±1.9 mb and 99.5±1.1 mb were obtained for ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ and ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}$, respectively. The results are compared with earlier measurements of ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ production from C targets using relativistic p, ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, and ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ projectiles. The ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(RHI,X${)\mathrm{}}^{11}$C cross sections are well described by a linear transport model, but are not in agreement with the predictions of strong factorization.