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We present a fully {\it ab initio}, non-perturbative, time-dependent approachto describe single and double ionization of helium by proton and antiprotonimpact. A flexible and accurate finite-element discrete-variable-representationis applied to discretize the problem on the radial grid in sphericalcoordinates. Good agreement with the most recent experimental data for absoluteangle-integrated cross sections is obtained over a wide range of incidentprojectile energies between 3 keV and 6 MeV. Furthermore, angle-differentialcross sections for two-electron ejection are predicted for a proton impactenergy of 6 MeV. Finally, the time evaluation of the ionization process isportrayed by displaying the electron density as a function of the projectilelocation.

Complete break-up of the helium atom by proton and antiproton impact