Energy-dependent fragmentation cross sections of relativisticC12

Abstract

The fragment production excitation functions of $^{12}\mathrm{C}$ interacting with carbon nuclei were measured in the energy range of 100--400 MeV/u. To measure cross sections as excitation functions, fragments produced from a thick carbon target bombarded with a monoenergetic $^{12}\mathrm{C}$ ion beam were detected by a telescope detector placed behind the target. By this measurement, eight isotopes---$^{11}\mathrm{B},^{10}\mathrm{B},^{10}\mathrm{Be},^{9}\mathrm{Be},^{7}\mathrm{Be},^{8}\mathrm{Li},^{7}\mathrm{Li}$, and $^{6}\mathrm{Li}$---were identified, and the energy dependence of their production cross sections in the few 100 MeV/u range was obtained. Based on the measured cross sections, the JAERI quantum molecular dynamics model was updated to incorporate the mechanisms particularly important for peripheral collisions. The improved version of the model coupled with a statistical decay model reproduces the measured data typically within a few 10% of difference.