Abstract
Differential cross sections for the elastic scattering of 344, 779, 964, 1086, 1112 and 1408 keV 152Eu gamma rays by Pb have been measured for nine scattering angles ranging from 3 degrees to 45 degrees and are compared with theoretical cross sections for Rayleigh plus nuclear Thomson scattering. For low momentum transfers the experimental results are in best agreement with theoretical cross sections computed using the Hartree-Fock form factor Rayleigh scattering amplitudes tabulated by Hubbell et al. (1975) but at all energies the experimental cross sections drop significantly below theoretical cross sections computed using Hartree-Fock form factor, relativistic point-Coulomb form factor, Kissel-Pratt and Johnson-Cheng 'exact', or Brown Rayleigh amplitudes for scattering angles above about 20 degrees . Inclusion of Delbruck scattering using the amplitudes of Papatzacos and Mork (1975) at 1408 keV reduces the disagreement between experimental and theoretical cross sections at that energy.