Differential cross sections for ionization of hydrogen-like atoms by proton and antiproton impact

Proton (p) - and antiproton ((p) over bar)-induced ionization of H(1s), He+ (1s), and Li2+ (1s) targets is theoretically investigated by the closure second-Born approximation. Triple and double differential cross sections are investigated as functions of the energy of the ejected electron into the scattering plane with fixed emission angles at 70, 200, and 500 keV incident energies. The dependence of the energy and angular distributions of the ionized electron on both the sign of the projectile charge and the nucleus charge of the target is analyzed. It is found that the heights and positions of the peaks and dips turn out to be sensitive to the details of the collision dynamics. Comparisons between the present calculations due to proton-induced reactions and their corresponding available theoretical predictions show reasonable agreement.