State selective differential cross sections for single and double electron capture in $He\text{sp}1,2+-He$ and $p-He$ collisons

Using the COLTRIMStechnique, scattering angle differential cross sections for single and double electron capture in collisions of protons and $He\text{sp}1,2+$ projectiles with helium atoms for incident energies of $60-630keV\mathrm{/}u$ are measured. We also report new theoretical results obtained by means of four-body one-channel distorted wave models (CDW-BFS, CDW-BIS and BDW), and find mixed agreement with the measured data.