Gamma rays |
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Photon emission from the electronic levels of atoms is a well established model that describes both the emission and absorption of radiation in the infrared, visible, UV and X-ray regions of the electromagnetic spectrum.  Gamma rays are more energetic photons emitted from the nuclei of atoms in most, (but not all), nuclear reactions. It appears that the same concept,; that of allowed energy levels; applies also to nuclei but the interactions in the nucleus are stronger and the model is not easily described mathematically. Gamma rays of particular photon energy (Dmc2) are emitted in electron-positron annihilation. |
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Gamma rays (in cosmic ray showers etc.) undergo Compton scattering in the atmosphere, which leads to the production of Cerenkov radiation. |