L-shell x-ray production cross sections for light ions on Sm, Yb, and Pb

Abstract

$L$-shell x-ray production cross sections for the $\mathrm{Ll}$, $L{\alpha }_{1,2}$, $L{\gamma }_1$, and $L{\gamma }_{2,3,\left(6\right)\mathrm{}}$ have been measured for ${}_{}{}^1{}_{}{}^{}\mathrm{H}$, ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, and ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ on Yb and Pb and for ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ on Sm. The energy ranges for the incident-ion species were 0.3 to 2.4 MeV/amu for ${}_{}{}^1{}_{}{}^{}\mathrm{H}$, 0.15 to 4.4 MeV/amu for ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, and 0.9 to 3.0 MeV/amu for ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$. Comparisons of the $L{\alpha }_{1,2}$, $L{\gamma }_1$, and $L{\gamma }_{2,3,\left(6\right)\mathrm{}}$ x-ray production cross-section data have been made to the predictions of the plane-wave Born approximation (PWBA) and the PWBA with corrections for Coulomb deflection and/or binding-energy effects. The comparisons show that for the individual x-ray production cross sections, there are problems associated with the binding-energy correction calculations for the $L{\gamma }_1$ and $L{\gamma }_{2,3}$ x-ray data. Furthermore, measurements of the ratio of $L{\alpha }_{1,2}$ to $L{\gamma }_{2,3}$ x-ray intensities do not support the use of an increased effective binding energy in the PWBA formulation.