  We present calculations of the electron angular distributions in the single
ionization of helium by 1-MeV proton impact at momentum transfer of 0.75 a.u.
and ejected-electron energy of 6.5 eV. The results using the first and second
Born approximations and the 3C model with different trial helium functions are
compared to the experimental data. A good agreement between theory and
experiment is found in the case of the 3C final state and a strongly correlated
helium wave function. The electron-electron correlations in the He atom are
found to influence the ratio of the binary and recoil peak intensities.
