Fragmentation of stable and neutron-rich C12-16 into boron fragments at approximately 240 MeV/nucleon *

The elemental fragmentation cross sections of boron fragments produced by stable and neutron-rich C12-16 beams with a carbon target were systematically measured at an incident beam energy of approximately 240 MeV/nucleon. The measured cross sections were found to increase as the projectile mass number increases. The observed feature is explained qualitatively based on the abrasion-ablation two-stage reaction model and is compared quantitatively with predictions from various reaction models, including empirical and statistical models. All models agree with the measured cross sections within a factor of 2.