Cross section for theC12(139La,X)11C reaction at relativistic energies

The cross section for the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ ${(}^{139}$La,X${)}^{11}$C reaction was measured using 1.26-GeV/nucleon ${}_{}{}^{139}{}_{}{}^{}\mathrm{La}$ ions. Annihilation radiation from the decay of ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ was counted using a large volume NaI(Tl) detector. The resulting cross section for ${}_{}{}^{139}{}_{}{}^{}\mathrm{La}$ was 147.9±2.0 mb. The results are compared with similar measurements using relativistic ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$, and ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}$ projectiles and the predictions of a linear transport model.