Abstract
The completeness of the radial eigenfunctions of the square of the total angular momentum is considered. They correspond to solutions of the radial Schrodinger equation with complex angular momentum. The physical scattering wave function at a fixed energy and Yukawa-like potentials is expanded in terms of this complete set. From the asymptotic behaviour at large distances of this expansion the Sommerfeld-Watson formula for the scattering amplitude is obtained. This dynamical derivation is compared with the usual kinematical analysis by means of symmetry groups.
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