2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/143243Using the COLTRIMStechnique, scattering angle differential cross sections for single and double electron capture in collisions of protons and $He\sp{1,2+}$ projectiles with helium atoms for incident energies of $60-630 keV/u$ 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.Atomic PhysicsState selective differential cross sections for single and double electron capture in $He\sp{1,2+}-He$ and $p-He$ collisonstext