Proton-induced L x-ray production cross sections and intensity ratios for Gd and Tb in the energy range 250-400 keV

The L x-ray production cross sections for Gd and Tb obtained by proton impact in the energy range 250-400 keV have been measured. The theoretical calculations for these x-ray production cross sections have been performed by perturbed stationary state theory with relativistic, energy loss and Coulomb deflection corrections using the theoretical values for x-ray emission rates, subshell fluorescence yields and Coster-Kronig transition probabilities. Due to the lack of other experimental data, the present results have been compared with the theoretical predictions and are found to be in reasonable agreement. The intensity ratios are also presented. (author)