Nuclear resonance fluorescence
it is a nuclear process in which a nucleus absorbs and emits high-energy photons called gamma rays
Nuclear resonance fluorescence (NRF) is a nuclear process in which a nucleus absorbs and emits high-energy photons called gamma rays. NRF interactions typically take place above 1 MeV, and most NRF experiments target heavy nuclei such as uranium and thorium. It is the analogous of the atomic resonance fluorescence for nuclear spectra.
At low temperatures, when nuclei do not recoil after the emission of the photon, the phenomenon is known the Mössbauer effect.
Description
Nuclear resonance fluorescence reactions are the result of nuclear absorption and subsequent emission of high-energy photons (gamma rays). As a gamma ray strikes the nucleus, the nucleus becomes excited (that is, the nuclear system as a quantum mechanical ensemble is put into a state with a higher energy). Much like electronic excitation, the nucleus will decay toward its ground state, releasing a high-energy photon at a number of possible, discrete energies. Thus, NRF can be quantified using spectroscopy. Nuclei can be identified by the distinct pattern of NRF emission peaks, although NRF analysis is much less straightforward than typical electronic emissions.
As the energy of incident photons increases, the average spacing between nuclear energy levels decreases.
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This entry incorporates text from “Nuclear resonance fluorescence” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.