The capture of slow antiprotons in helium, neon and argon

We consider the capture of antiprotons with energies less than roughly 27 e V by helium, neon and argon atoms. We use the adiabatic 'hidden-crossing' t heory to calculate both the capture cross-sections and the angular distribu tion of the antiprotons. We find that important differences between helium and the other noble gases can be attributed to the properties of the 'hidde n' crossings appropriate to each system.