K X-ray emission induced by 12C4+ and 16O5+ ion impact on selected lanthanoids

Abstract: Measurements of K-shell X-ray production cross sections by 12C4+ (beam energies between 12MeV and 14MeV), and 16O5+ ions (with energies between 12.5MeV and 15MeV) are presented. The target elements were selected lanthanoids (Ce, Gd, Dy, Ho and Er). The resulting measurements are evaluated through comparisons with the eECPSShsR-UA theory, the MECPSSR model and the adiabatic perturbation (also known as direct molecular orbital, MO) theory, using a scaling based on the reduced velocity parameter . Consideration is given to multiple ionization effects and electron capture contribution to K-shell ionization. An evaluation with previously published values is also given. It is shown that the behavior of the ratios of experimental to theoretical cross sections is different for both ions. The models do not seem to be accurate to predict the X-ray production cross sections for 12C4+ ions, while the MECPSSR theory predicts much better the experimental data for 16O5+ than the eECPSShsR-UA. [Copyright &y& Elsevier]