Scattering of Antiprotons by Nuclei (Atoms) in the Range of Low Energies   $E\lesssim 10^5$ eV. Mirror Reflection, Diffraction, and Channeling of   Antiprotons in Crystals
  Studying antiproton scattering by nuclei (atoms) in the range of low energies, we found out that the increase in the antiproton-nucleus scattering amplitude through Coulomb interaction provides the possibility to investigate spin-dependent processes accompanying the interaction of antiprotons with nuclei (polarized or unpolarized) by means of mirror reflection of antiprotons from the vacuum-matter boundary, diffraction and channeling (surface diffraction and channeling) of antiprotons in crystals. 
V.G. Baryshevsky
nucl-th hep-ph