X-ray production cross sections, intensity ratios, and centroid energy shifts ofandandx rays produced bybeams of 12-50 MeV
- 1 December 1974
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 10 (6) , 1932-1937
- https://doi.org/10.1103/physreva.10.1932
Abstract
The 12-50-MeV beam-induced and x rays of Ag and the x rays of Au from thin targets were studied with a Si(Li) detector. Absolute and x-ray production cross sections were derived from measured x-ray yields and compared to available theoretical calculations for inner-shell Coulomb ionization cross sections. Inclusion of Coulomb repulsion, binding, and effects in the plane-wave Born-approximation calculations gives good agreement with experimental values of for Ag. The agreement between theory and experiment for -shell ionization is not as good, possibly owing to the effects of multiple ionization on the fluorescence yield, although the energy dependence of for Au is well reproduced. The energies of the and and , , and lines were observed to change with beam energy as did the intensity ratios of these lines. HFS calculations for the and lines indicate that the observed shifts are probably associated with multiple -, not -, shell ionization.
Keywords
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