Low energy antiproton-nucleus elastic scattering

We have studied antiproton elastic scattering on Al, Cu, and Pb for two incident momenta: 514 and 633 MeV/c. The angular region covered extends from the forward Coulomb region to approximately 30 deg. The differential cross sections were analyzed using a nonrelativistic optical potential of the Woods-Saxon form, with the imaginary shape taken from electron scattering data. We obtained fits for the strengths of the real and imaginary parts of the potential, ($V_0$, $W_0$), of (51, 116) MeV for Al, (12, 71) MeV for Cu, and (12, 278) MeV for Pb.