Density effect in Cu K-shell ionization by 5.1-GeV electrons
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- April 1992
- DOI:
- 10.1103/PhysRevLett.68.2293
- Bibcode:
- 1992PhRvL..68.2293M
- Keywords:
-
- 34.80.Dp;
- Atomic excitation and ionization by electron impact