K-shell ionization cross sections for Ti, Cr, Co, Ni, Cu, and Zn targets induced by protons in the energy range 300 — 2400 keV

Abstract

Absolute $K$-shell x-ray-production cross sections have been measured for thin-foil targets of Ti, Cr, Co, Ni, Cu, and Zn at incident proton beam energies from 300 to 2400 keV. Particular care was necessary in the control of experimental conditions in order to determine the x-ray-production cross sections with high precision (\ensuremath{\sim}5%). The x-ray-production cross sections were determined from x-ray yields normalized to simultaneous measurements of particle scattering yields at 90\ifmmode^\circ\else\textdegree\fi{}. The values of $K$-shell vacancy-production cross sections were determined to range from 0.133 b for 300-keV protons on Zn to 1230 b for 2400-keV protons on Ti. The overall agreement of these total cross sections with recent data obtained by other workers generally is to within 10% and frequently is to within the 5% accuracy of our results. The $K$-shell ionization cross sections inferred from these results are compared with the predictions of energy-loss Coulomb-deflection perturbed-stationary-state relativistic theory which reproduces the data with good accuracy. In addition, these results also show good agreement when compared with a more fundamental formulation based on perturbed-stationary-state theory.