Photodisintegration (also called phototransmutation) is a physical process in which an extremely high energy gamma ray is absorbed by atomic nucleus and causes it to enter an excited state, which immediately decays by emitting a subatomic particle. A single proton or neutron or an alpha particle is effectively knocked out of the nucleus by the inc...
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http://en.wikipedia.org/wiki/Photodisintegration
in physics, nuclear reaction in which the absorption of high-energy electromagnetic radiation (a gamma-ray photon) causes the absorbing nucleus to ... [3 related articles]
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http://www.britannica.com/eb/a-z/p/60
is the breakup of nuclei by the absorption of energetic photons. This can occur in the core of a massive star which has proceeded to the end of the fusion sequence. With no further energy-producing fusion reactions taking place, the iron core shrinks and heats up until there are thermal photons with sufficient energy to break up the 56Fe nuclei.
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http://www.sheffield.ac.uk/polopoly_fs/1.14548!/file/glossary.pdf
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