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Collisions of antiprotons with He-, Ne-, Ni-like, bare, and neutral uraniumare studied theoretically for scattering angles close to 180$^{\circ}$ andantiproton energies with the interval 100 eV -- 10 keV. We investigate theCoulomb glory effect which is caused by a screening of the Coulomb potential ofthe nucleus and results in a prominent maximum of the differential crosssection in the backward direction at some energies of the incident particle. Wefound that for larger numbers of electrons in the ion the effect becomes morepronounced and shifts to higher energies of the antiproton. On the other hand,a maximum of the differential cross section in the backward direction can alsobe found in the scattering of antiprotons on a bare uranium nucleus. The lattercase can be regarded as a manifestation of the screening property of thevacuum-polarization potential in non-relativistic collisions of heavyparticles.

Backward scattering of low-energy antiprotons by highly charged and neutral uranium: Coulomb glory