fission

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fission,

in physics: see nuclear energynuclear energy,
the energy stored in the nucleus of an atom and released through fission, fusion, or radioactivity. In these processes a small amount of mass is converted to energy according to the relationship E = mc2, where E is energy, m
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 and nucleusnucleus,
in physics, the extremely dense central core of an atom. The Nature of the Nucleus
Composition

Atomic nuclei are composed of two types of particles, protons and neutrons, which are collectively known as nucleons.
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; see also atomic bombatomic bomb
or A-bomb,
weapon deriving its explosive force from the release of nuclear energy through the fission (splitting) of heavy atomic nuclei. The first atomic bomb was produced at the Los Alamos, N.Mex., laboratory and successfully tested on July 16, 1945.
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.
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fission

(fish -ŏn) See nuclear fission.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

fission

[′fish·ən]
(biology)
A method of asexual reproduction among bacteria, algae, and protozoans by which the organism splits into two or more parts, each part becoming a complete organism.
(nuclear physics)
The division of an atomic nucleus into parts of comparable mass; usually restricted to heavier nuclei such as isotopes of uranium, plutonium, and thorium. Also known as atomic fission; nuclear fission.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

fission

1. Biology a form of asexual reproduction in single-celled animals and plants involving a division into two or more equal parts that develop into new cells
2. short for nuclear fission
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
The UNIT propulsion system consists of two chambers which act as a fusion reactor (main chamber) for neutronic fusion and a fission reactor (sub-chamber) for binary fission, respectively.
Nuclear fission is a man-made deliberately-produced nuclear reaction, achieved with the help of neutrons and hence UNIT also follows the same methodology for inducing fission reaction in the fuel atoms filled in a portion of the sub-chamber.
"However, we measured an asymmetric mass distribution of the fission
The result follows other attempts to understand similar fission processes
Fission of uranium atoms, in which they spontaneously shatter into less-massive atoms, produced precursors of xenon gas.
The Washington University team knew that fission of uranium atoms could directly produce isotopes of xenon.
In that case, the control system failed and the fission rate increased and melted down the lower part of the core.
In a breeder reactor, some neutrons produced in the fission of uranium 235 are absorbed by uranium 238.
grammicus complex, they should still be negatively heterotic." Meiotic disruption has not been demonstrated in hybrid individuals heterozygous for the centric fission mutations that delineate most S.
The F5 cytotype differs from the hypothesized ancestral S (standard, 2n = 31[male]; 32[female]) cytotype by a single fission rearrangement.
In the end they discovered instances of spontaneous fission that did not correspond to anything they could identify.
Experimenters need to identify the products of such unusual fission or other radioactivity to determine precisely what is going on.