Mangiarotti, A.; JakubassaAmundsen, D. H.
(2017):
Higherorder theories for relativistic electronatom bremsstrahlung in comparison with experiment.
In: Physical Review A, Vol. 96, No. 4, 42701

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Abstract
The analytic SommerfeldMaue theory, including the nexttoleadingorder correction, and the relativistic Dirac partialwave theory are probed by a systematic comparison of the bremsstrahlung spectra with available experimental data. These measurements cover a wide range of nuclear charge numbers (13 <= Z <= 79), collision energies (110 MeV), and photon angles (4 degrees <= theta(k) <= 60 degrees). It is found that the analytic model performs well for Z <= 13 at all angles down to very low photon frequencies. For high charge numbers, at high photon energies (i.e., in the shortwavelength limit) or for the larger angles at all photon energies, the partialwave theory has to be used. For intermediate Z <= 50, the maximum angle up to which the analytic formulae can be used decreases with increasing Z.