Exotic Rydberg atom formation in low-energy antiproton-helium collisions

Exotic Rydberg atom formation in collisions between low-energy antiprotons and helium atoms is studied. We present state-selective (n, l) capture cross sections for antiproton-capture from He-3 and He-4 targets as a function of impact energy. The simulation is based on the 3-body classical trajectory Monte Carlo method. We find the resulting (n, l) distributions of captured antiprotons in good agreement with recent measurements.