Direct reactions, asymmetric scattering

As relative kinetic energy increases, the lifetime of the intermediate complex decreases and there is a transition to a direct reaction. The interaction time is too short for the intermediate to rotate and the Newton diagram contour plot becomes asymmetric with respect to the CM. The dependence of reaction probability on impact parameter and the effective potential for the approach and retreat trajectories determine the scattering angle and the form of the Newton diagram. 

Direct reactions. The characteristic reaction profile of the direct reaction is shown in Fig. 2.8, a. The specific feature of this profile is the presoice of one extreme (maximum) on the profile of the reaction path. The angular distribution of products in these reactions is strongly asymmetrical relatively to the scattering angle 0 = 90°. It follows from this that the redistribution of atoms occurs within... 

Schematic drawing of a poiarization experiment and illustration of the spin-orbit interaction. The bombarding particie is poiarized during the scattering on nucleus No. 1. This means, that its spin wiii be oriented, e.g., into the reaction piane. As a result, the scattering by nucleus No. 2 will be asymmetric e.g., more particies wiii be scattered in direction A than in direction B...

---