Delbrück and nuclear Rayleigh effects in elastic photon scattering in the giant dipole resonance region

Elastic photon scattering at the excitation energy of the giant dipole resonance in medium- and heavy-mass nuclei is described by a coherent superposition of Thomson, Delbrück, and nuclear Rayleigh amplitudes, the last being evaluated within the framework of the interacting boson model. New accurate tables of Delbrück amplitudes are also given for 9≤$E_{\gamma }$≤30 MeV and 0°<θ<120°. .AE