nuclear reaction(redirected from Nuclear reactions)
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A reaction, as in fission, fusion, or radioactive decay, that alters the energy, composition, or structure of an atomic nucleus.
(General Physics) a process in which the structure and energy content of an atomic nucleus are changed by interaction with another nucleus or particle
1. action in response to some influence, event, etc.: the nation's reaction to the president's speech.
a. a physiological response to an action or condition.
b. a physiological change indicating sensitivity to foreign matter: an allergic reaction.
3. an action in a reverse direction or manner.
4. a movement toward extreme political conservatism; a desire to return to an earlier system or order.
a. the reciprocal action of chemical agents upon each other; chemical change.
b. a process that, unlike a chemical reaction, has the power to change the nucleus of an atom, as radioactive decay, fission, or the like.
6. Mech. the instantaneous response of a system to an applied force, manifested as the exertion of a force equal in magnitude, but opposite in direction, to the applied force.
[1635–45; on the model of react]
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|Noun||1.||nuclear reaction - (physics) a process that alters the energy or structure or composition of atomic nuclei|
natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"
chain reaction - a self-sustaining nuclear reaction; a series of nuclear fissions in which neutrons released by splitting one atom leads to the splitting of others
radioactive decay, disintegration, decay - the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
endoergic reaction - a nuclear reaction occurring with absorption of energy
exoergic reaction - a nuclear reaction accompanied by the evolution of energy
nuclear fission, fission - a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
nuclear fusion, nuclear fusion reaction, fusion - a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
natural action, natural process, action, activity - a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity"
spallation - (physics) a nuclear reaction in which a bombarded nucleus breaks up into many particles; "some astronomers believe that the solar system was formed by spallation when the sun was a very young star"