Dynamic role of coupled-channel wave phases on the structural determination of angular distributions

It is still a question of interest why the distorted-wave Born approximatio n theory predicts well the structure of the angular distributions particula rly at low energies, in good agreement with the coupled-channel wave theory . The phases of the coupled-channel waves are found to be crucially importa nt in determining the structures of the angular distributions. The phases o f coupled-channel wave functions are shown to be close to the phase of the entrance channel in the classically forbidden region at low energies, thus allowing agreement between the two theories. [S1050-2947(99)01803-X].