Radiative Processes in the Presence of Heavy Nuclei

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Abstract
Calculations of the cross sections for bremsstrahlung and pair production are carried out without the use of the Born approximation, but by reducing the calculation of these cross sections to the calculation of the exact elastic scattering of electrons and positrons, the last quantities having been tabulated to some extent. Large deviations from the Born approximation results are obtained in the angular distributions of these radiative processes, but arguments are presented that the Born approximation should yield the integrated cross sections correctly at sufficiently high energies. The failure of the Born approximations for relativistic equations is explained in a purely classical way.

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