Differential cross sections for electron capture from atomic hydrogen by fast alpha particles

Electron capture in collisions of fast alpha particles with atomic hydrogen is studied by means of the prior version of the three-body boundary-corrected intermediatestates method (BCIS-3B). State-selective and state-summed differential cross sections are presented for the final state n up to nmax = {2,3,4}, depending on the incident energy. The contributions from higher excited states with n > nmax are included using the Oppenheimer n?3 scaling law. The observed angular dependencies of the obtained differential cross sections are analyzed in detail, for incident projectile energy values of E = {100, 150, 300} keV/amu (intermediate) and E = {1.3, 2.5, 5.0, 7.5, 12.5} MeV/amu (high energy values).