  We present ionization cross sections for antiproton and helium collisions
based on ab-initio time-dependent coupled channel method. In our calculations a
finite basis set of regular helium Coulomb wave packets and Slater function
were used. The semiclassical approximation was applied with the time-dependent
Coulomb potential to describe the antiproton electron interaction. Three
different projectile energies were considered as 10, 50 and 100 keV. We found
clear evidence for the formation of the anti-cusp in the differential
distributions.
