Universal empirical fit to L-shell X-ray production cross sections in ionization by protons

Abstract

Abstract A compilation published in 2014, with a recent 2017 update, contains 5730 experimental total L-shell X-ray production cross sections (XRPCS). The database covers an energy range from 10 keV to 1 GeV, and targets from 18 Ar to 95 Am. With only two adjustable parameters, universal fit to these data normalized to XRPCS calculated at proton velocity v 1 equal to the electron velocity in the L-shell v 2L , is obtained in terms of a single ratio of v 1 / v 2L . This fit reproduces 97% of the compiled XRPCS to within a factor of 2.