Coulomb corrections in quasi-elastic scattering based on the eikonal expansion for electron wave functions
J. A. Tjon, S. J. Wallace
Abstract
An eikonal expansion is developed in order to provide systematic corrections to the eikonal approximation through order 1/k2, where k is the wave number. The expansion is applied to wave functions for the Klein-Gordon equation and for the Dirac equation with a Coulomb potential. Convergence is rapid at energies above about 250 MeV. Analytical results for the eikonal wave functions are obtained for a simple analytical form of the Coulomb potential of a nucleus. They are used to investigate distorted-wave matrix elements for quasi-elastic electron scattering from a nucleus. Focusing factors are shown to arise from the corrections to the eikonal approximation. A precise form of the effective-momentum approximation is developed by use of a momentum shift that depends on the electron's energy loss.
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