Lx-ray-production cross sections for (120-400)-keV proton bombardment of indium

Abstract

The $L$-shell x-ray production in indium due to proton bombardment was studied using thin indium targets (19 \ensuremath{\mu}g/${\mathrm{cm}}^{2}$) over the proton energy range 120-400 keV. The total x-ray cross sections and five subshell cross sections were determined at 20-keV intervals in the energy range. The x rays were observed with a high-purity Ge low-energy-photon spectroscopy detector. The experimental cross sections were compared to the perturbed stationary-state theory with relativistic and Coulomb deflection corrections (CPSSR). The total $L$-shell x-ray cross sections were found to be in good agreement with the CPSSR theory. For the $L{\ensuremath{\alpha}}_{1,2}$ and $L{\ensuremath{\beta}}_{2,15}$ x-ray cross sections there was also reasonable agreement with the CPSSR theory. For the $L\ensuremath{\beta}$, $L{\ensuremath{\gamma}}_{1}$, and $L{\ensuremath{\gamma}}_{2,3}$ x-ray cross sections there is an effect that depends upon the proton energy. The ratios of these experimental and theoretical cross sections vary from about 1 at higher proton energies to near 2 for the lowest proton energies.