Delbruck and Rayleigh scattering by uranium investigated at photon energies between 0.1 qnd 1.5 MeV

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Abstract
Using radioactive sources, high-precision differential cross sections for elastic scattering of photons by U (Z=92) have been measured for energies between 0.1 and 1.5 MeV and scattering angles ranging from 15 degrees to 150 degrees . The experimental results have been interpreted in terms of Rayleigh, nuclear Thomson, nuclear resonance and Delbruck scattering. Below 0.5 MeV the Rayleigh theory based on the second-order S matrix and Dirac-Hartree-Fock-Slater wavefunctions has been confirmed to within 3% on average. At energies between 0.9 and 1.5 MeV definite evidence has been obtained for dispersive Delbruck scattering. The excellent agreement between experiment and lowest-order Delbruck theory shows that Coulomb corrections are small at these energies.