K X-ray emission induced by 12C 4+ and 16O 5+ ion impact on selected lanthanoids

Abstract

Measurements of K-shell X-ray production cross sections by 12C 4+ (beam energies between 12 MeV and 14 MeV), and 16O 5+ ions (with energies between 12.5 MeV and 15 MeV) 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 ξ K R . 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 12C 4+ ions, while the MECPSSR theory predicts much better the experimental data for 16O 5+ than the eECPSShsR-UA.