Fragmentation Of ¹²C On CH₂ Target At 290 A MeV

Study of intermediate energy nucleus-nucleus collision affects many important areas, the heavy ion therapy and tumor treatment is one of them. The total and partial charge-changing cross section and the angular distribution of secondary particles in heavy ion induced target nuclear reaction can help us to understand nuclear fragmentation mechanism, to improve the nucleus-nucleus reaction model, and to provide some experimental information for radiation protection and tumor therapy with heavy ions.The total charge-changing cross sections, the partial cross sections of the production of projectile fragments, the scattering angles of beam particles and the emission angles of projectile fragments of carbon ion induced CH₂ target interactions are investigated by using CR-39 plastic track detector. The experiment was performed at Heavy Ion Medical Accelerator at Chiba?HIMAC?, National Institute Radiological Sciences?NIRS?, Japan. It is found that the total charge-changing cross sections are in good agreement with the results from other experimental results at the nearly same energies and the prediction of Bradt-Peters semi-empirical formula within the experimental errors. The mean emission angle of projectile fragments is greater than the mean scattering angle of beam ions, and the distribution is broadened.