Growth of Interaction Between Antiprotons (Negative Hyperons) and Nuclei   in Polarized Matter: The Possibility to Study the Spin-Dependent Part of the   Forward Scattering Amplitude in the Range of Low-Energies
  The influence of Coulomb interaction on the phenomenon of "optical" spin rotation of negatively charged particles (antiprotons, etc.) moving in matter with polarized nuclei is considered. It is shown that because the density of the antiproton (negative hyperon) wave function on the nucleus increases, the spin precession frequency grows as the particle decelerates. As a result, spin rotation of negatively charged particles becomes observable despite their rapid deceleration. This provides information about the spin--dependent part of the amplitude of coherent elastic zero--angle scattering in the range of low energies, where scattering experiments are practically impossible to perform. 
V.G. Baryshevsky
nucl-th hep-ph