Mott-Schwinger effect in the elastic scattering of neutrons from 209Bi

The Mott-Schwinger potential arising from the interaction of the magnetic moment of a neutron incident upon an electric field (of 209 Bi) is found to have a profound effect upon the elastic scattering cross sections and polarisations at 0.5, 14.5 and 24 MeV. These effects are evaluated by specific solution of the relevant Schroedinger equations (for 100 partial waves) and with the Born approximation used to define the influence upon all higher ones. The actual calculated phase shifts and how the scattering amplitudes can be formed are also discussed. 13 refs., 1 tab., 4 figs