gamma decay

noun Physics.
type of radioactivity in which an unstable atomic nucleus dissipates energy by gamma emission, producing gamma rays.
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Science Dictionary
gamma decay  
A radioactive process in which an atomic nucleus loses energy by emitting a gamma ray (a stream of high-energy photons). When an element undergoes gamma decay its atomic number and mass number do not change.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Alpha and beta decay are almost always accompanied by gamma decay.
Gamma decay is the release of energy in the form of gamma rays.
In a gamma decay, a high energy photon is emitted from the nucleus to attain a
  lower energy configuration.
In the gamma decay of a nucleus, the emitted photon and recoiling nucleus each
  have a well-defined energy after the decay.
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