The coherent X-ray scattering by atomic nuclei is practically unobservable due to the large nuclear mass. The most striking effect is the delayed nature of the coherent scattering after synchrotron pulse excitation. This delay in the appearance of the diffracted photon serves as a way to discriminate the nuclear scattering from the much stronger, prompt electronic scattering and fluorescence background. Hyperfine nuclear resonance of 57Fe. The F2 wiggler station is often used for nuclear resonance scattering studies.
Solid curves are dynamical diffraction theory calculations, including the angular phase.