X ray emission for 20 MeV to 55 MeV C4+ ions impacting on Cu target

The ionization of the Cu K shell by collisions of C4+ ions at energies ranging from 20 MeV to 50 MeV is studied, and the K x-ray spectra of Cu are measured using an HPGe detector. The relationship between the relative intensity ratio of Kβ and Kα x rays emitted from Cu and the kinetic energy of incident ions is investigatedand compared with data for singly ionized atoms. The results show that the relative intensity ratio of Kβ to Kα x ray of Cu target decreases with the increase of incident ion kinetic energy, and the ratio is larger than the data of singly ionized atoms. The K x- ray production cross section of target atom is calculated by using the thick target cross-section formula, and compared with the results obtained from different theoretical models. The results show that the total production cross sections of Kβ and Kα x ray with the increasing incident ion kinetic energy are in close agreement withthe BEA modified model which takes multiple ionization into account.