Eikonal analysis of Coulomb distortion in quasi-elastic electron scattering

Details Eikonal analysis of Coulomb distortion in quasi-elastic electron scattering Eikonal analysis of Coulomb distortion in quasi-elastic electron scattering

2008-05-28

arxiv.org/abs/0805.4396v1

Physics

Nuclear Physics

Nuclear Theory

12 pages, 6 Postscript figures

Scientific paper

An eikonal expansion is used to provide systematic corrections to the eikonal approximation through order $1/k^2$, where $k$ is the wave number. Electron wave functions are obtained for the Dirac equation with a Coulomb potential. They are used to investigate distorted-wave matrix elements for quasi-elastic electron scattering from a nucleus. A form of effective-momentum approximation is obtained using trajectory-dependent eikonal phases and focusing factors. Fixing the Coulomb distortion effects at the center of the nucleus, the often-used ema approximation is recovered. Comparisons of these approximations are made with full calculations using the electron eikonal wave functions. The ema results are found to agree well with the full calculations.

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