Nuclear Resonant Scattering (NRS) is a nuclear process for which decay via electromagnetic radiation interferes.
Different excited hyperfine levels from different nuclei are simultaneously occupied, via excitation from a high brilliance source such as synchrotron radiation. Decay to lower states happens almost simultaneously. The emitted photons have slightly different wavelengths, causing interference. Such as slightly off-tuned instruments create a beat pattern in the sound, the intensity of the emitted radiation of the nuclei will appear with such a beat pattern in time, i.e. the intensity of the beam will vary according to the interference, as can be seen in figure 1. [Insert experimental time spectrum here]