Abstract
Direct reaction theory attempts to solve the Schrödinger equation for a specific model of the components thought to be important in a reaction, with the component interaction potentials. In direct reaction theories, the phases describing the superposition of all parts of the wave function are coherently maintained, and the potentials typically include imaginary components to model how flux is lost from the channels of the model to other channels. Direct reactions are connected directly or via several steps with the elastic entrance channel, and therefore have cross sections that depend on the exit angles relative to the initial beam direction. The intermediate states in theories of direct reactions are the discrete states of two interacting nuclei and the relative motion of these nuclei.
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