Collisions of low-energy antiprotons with molecular hydrogen: ionization, excitation and stopping power

Abstract

A time-dependent coupled-channel approach was used to calculate ionization, excitation, and energyloss cross sections as well as energy spectra for antiproton and proton collisions with molecular hydrogen for impact energies 8 < E < 4000 keV.

Interaction of antiprotons with Rb atoms and a comparison of antiproton stopping powers of the atoms H, Li, Na, K, and Rb

“…All curves are smooth, fall off with increasing ǫ and no resonance structures can be seen for p impact which is also the case for p + H 2 collisions [5]. This is in contrast to the spectra for electron loss in the case of p collisions where a pronounced resonance can be observed for ǫ = E/Mp = v 2 /2 [7]. The resonance originates from the electron capture process by the p. Thereby, the ionized and then captured electron moves with approximately the velocity v of the p.…”