Physical Review Letters
We have made an absolute measurement of the Cu K-shell impact ionization cross section by 5.1-GeV electrons, which demonstrates directly a density effect predicted by Fermi in 1940. By determining the ratio of the K x-ray yield from a thin front and back layer of the target by a novel grazing emission method, we have verified the effect of transition radiation on the x-ray production, suggested by Sorensen and reported by Bak et al.
Original Publication Citation
Meyerhof, W. E., Jensen, D. G., Kawall, D. M., Kuhn, S. E., Spooner, D. W., Meziani, Z. E., & Faust, D. N. (1992). Density effect in Cu K-shell ionization by 5.1-GeV electrons. Physical Review Letters, 68(15), 2293-2296. https://doi.org/10.1103/PhysRevLett.68.2293
Meyerhof, W. E.; Jensen, D. G.; Kawall, D. M.; Kuhn, S. E.; Spooner, D. W.; Meziani, Z. E.; and Faust, D.. N., "Density effect in Cu K-shell ionization by 5.1-GeV electrons" (1992). Physics Faculty Publications. 473.