The elastic phase shifts for the ${}_{}{}^{16}{}_{}{}^{}\mathrm{Si}$ scattering obtained by the algebraic approach to scattering theory are used in an inversion procedure at fixed energy. The resulting local optical potential shows oscillations and a dependence on energy. These effects point to an underlying nonlocal interaction.

• Received 31 August 1988

DOI:https://doi.org/10.1103/PhysRevC.39.1201