32.80.Hd Auger effect (including Coster-Kronig transitions); Mechanical effects of light on atoms, molecules, and ions, see 37.10.Vz; Atom cooling methods, traps and guides, see 37.10.De and 37.10.Gh; Atoms in optical lattices, see 37.10.Jk
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We present calculations for the impact-parameter dependence of K-shell ionization rates in p¯-Cu and in p¯-Ag collisions at various projectile energies. We show that the effect of the attractive Coulomb potential on the Rutherford trajectory and the antibinding effect caused by the negative charge of the antiproton result in a considerable increase of the ionization probability. Total ionization cross sections for proton and antiproton projectiles are compared with each other and with experimental ionization cross sections for protons.