Projectile Dependency of Radioactivities of Spallation Products Induced in Copper

Abstract

The radioactivities of spallation products in a Cu target were obtained by bombarding 230 and 100 MeV/nucleon Ne, C, He, p ions. Irradiation experiments were performed at the HIMAC (Heavy Ion Medical Accelerator in Chiba) facility, National Institute of Radiological Sciences. The gamma-ray spectra from irradiated samples were measured with a HPGe detector. From the gamma-ray spectra, we obtained the variation of radioactivities of nuclides produced in Cu sample with Cu target thickness and the mass-yield distribution of nuclides produced in Cu sample on the surface of Cu target. The results showed that the dependence of the cross sections on the projectile mass strongly depends on the mass number difference between Cu and produced nuclide.