CuKαKβX-Ray Production from Proton and Oxygen Bombardment

Abstract

$K_{\alpha }$ and $K_{\beta }$ x rays produced in the bombardment of Cu with protons of 6- to 10-MeV incident energy and with ${\mathrm{O}}^{4+}$ ions of 15- to 19-MeV incident energy have been measured using a 4-mm-thick cooled Si(Li) detector with an instrumental resolution of 280 eV. The $\frac{K_{\alpha }}{K_{\beta }}$ transition ratios are observed to be constant over the energy range studied with a value of 7.8±0.1 for proton excitation and 7.0±0.1 for the oxygen excitation, compared to a previous experimental value of 7.33 for electron excitation and a calculated value of 8.2. The cross section for x-ray production at 90° to the beam direction for 7-MeV protons on Cu is 23.9±3.6 b/sr and for 15-MeV oxygen on Cu is 0.88±0.27 b/sr. The $K_{\beta }$ peak produced by oxygen bombardments is observed to shift upwards in energy by 97±15 eV relative to the $K_{\beta }$ peak produced in proton bombardments.