Ionization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Au</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mn>8</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>and electron capture by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Au</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mn>9</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>at 10.8 GeV/nucleon

We have measured the cross sections for ionizating one-electron ${\mathrm{Au}}^{78+}$ and the total cross sections for electron capture by bare ${\mathrm{Au}}^{79+}$ at 10.8 GeV/nucleon in C, Al, Cu, Ag, and Au targets. We made the measurement by magnetically separating the charge states and measuring the fraction of ${\mathrm{Au}}^{78+}$ as a function of target thickness for each element. In contrast to the results reported by Westphal and He [Phys. Rev. Lett. 71, 1160 (1993)], our ionization measurements agree with the calculation of Anholt and Becker [Phys. Rev. A 36, 4628 (1987)]. Our capture cross-section measurements are in agreement with theory for those targets where radiative electron capture is the dominant capture process.

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