Induced gamma emission (IGE) refers to a process in which gamma-ray photons are emitted from a nucleus when it is excited by an external source of gamma radiation. This phenomenon is somewhat analogous to stimulated emission in laser physics, where an external photon stimulates an excited atom or molecule to emit a photon of the same energy. In the case of induced gamma emission, a nucleus in an excited state can absorb a gamma photon, leading to the emission of a gamma photon of the same energy.
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