Density Effect in Relativistic K-shell Ionization
- D. W. Spooner
- W. E. Meyerhof
- J. J. Kuffner
- E. C. Montenegro
- K. Ishii
- S. E. Kuhn
- D. M. Kawall
- D. G. Jensen
- Z.-E. Meziani
Abstract
Using a grazing emission method, we have made measurements of 22.6-GeV
electron impact ionization cross sections at the front and back faces
of ~70-micrometer thick Al and Cu foils. these give, respectively the
cross sections without and with a density effect predicted by Fermi.
For Cu, the back cross section ratio at 22.6 and 5.1 GeV (previously
measured) is 1.00 +- 0.04, confirming the predicted energy independece
of this cross section. The absolute cross sections agree overall with
theoretical calculations.
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