The role of reversed kinematics and double kinematic solutions in nuclear reactions studies

The advantages of reversed kinematics in nuclear reactions studies are discussed, with particular emphasis on the origin of double solutions in the reaction kinematics. This possibility for double solutions does not exist in normal kinematics, and provides the basis for a new method of imposing important experimental constraints on the uniqueness of fitting complex observations. By gating on one or the other of the two solutions, light particle kinematics can be greatly influenced in coincidence measurements. The power of the method is illustrated with data from the reaction 1030 MeV ¹²¹Sb + ²⁷Al, where charged particle emissions arise from several different sources.