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fission    音标拼音: [f'ɪʃən]
n. 裂开,分裂,裂变

裂开,分裂,裂变

fission
n 1: reproduction of some unicellular organisms by division of
the cell into two more or less equal parts
2: a nuclear reaction in which a massive nucleus splits into
smaller nuclei with the simultaneous release of energy [synonym:
{fission}, {nuclear fission}]

Fission \Fis"sion\, n. [L. fissio. See {Fissure}.]
1. A cleaving, splitting, or breaking up into parts.
[1913 Webster]

2. (Biol.) A method of asexual reproduction among the lowest
(unicellular) organisms by means of a process of
self-division, consisting of gradual division or cleavage
of the into two parts, each of which then becomes a
separate and independent organisms; as when a cell in an
animal or plant, or its germ, undergoes a spontaneous
division, and the parts again subdivide. See
{Segmentation}, and {Cell division}, under {Division}.
[1913 Webster]

3. (Zool.) A process by which certain coral polyps,
echinoderms, annelids, etc., spontaneously subdivide, each
individual thus forming two or more new ones. See
{Strobilation}.
[1913 Webster]

4. (Physics) The act or process of disintegration of an
atomic nucleus into two or more smaller pieces; called
also nuclear fission. The process may be spontaneous or
induced by capture of neutrons or other smaller nuclei,
and usually proceeds with evolution of energy.
[PJC]

124 Moby Thesaurus words for "fission":
ablate, abscission, accelerate, activate, alpha decay, amputation,
atom-chipping, atom-smashing, atomic disintegration,
atomic reaction, atomization, atomize, beta decay, bifurcate,
bisect, bombard, bombardment, branch, break into pieces,
break to pieces, break up, breeding, bullet, butchering, by two,
catalysis, catalyst, chain reaction, chopping, cleavage, cleave,
come apart, consume, corrode, crack up, crash, cross-bombard,
crumble, crumble into dust, crunch, crush, cut in two,
cut to pieces, cutting, decay, decompose, demolish, dialysis,
dichotomize, dichotomy, diffuse, dimidiate, disintegrate,
disintegration series, disjoin, disorganize, disperse, disrupt,
dissociation, dissolve, divide, enucleation, erode,
exchange reaction, excision, fall to pieces, fission reaction,
fork, fragment, gamma decay, grind, halve, hydrolysis, hydrolyst,
in half, ionization, laceration, make mincemeat of, mince, molder,
mutilation, neutron reaction, nonreversible reaction,
nuclear fission, nucleization, nucleize, photodisintegration,
photolysis, proton gun, proton reaction, pulverize, ramify,
rending, resection, reversible reaction, ripping, scatter,
scission, section, severance, shatter, shiver, slashing, slicing,
smash, smash the atom, smash up, splinter, split, split in two,
splitting, splitting the atom, squash, squish, stimulation,
subdivide, surgery, target, tearing, thermolysis,
thermonuclear reaction, transect, waste away, wear away

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  • Nuclear fission - Wikipedia
    Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei The fission process often produces gamma photons, and releases a very large amount of energy even by the energetic standards of radioactive decay Nuclear fission was discovered by chemists Otto Hahn and Fritz Strassmann and physicists Lise Meitner and Otto Robert Frisch Hahn and Strassmann
  • Fission and Fusion: What is the Difference? | Department of . . .
    Fission occurs when a neutron slams into a larger atom, forcing it to excite and split into two smaller atoms—also known as fission products Additional neutrons are also released that can initiate a chain reaction
  • Nuclear fission | Examples Process | Britannica
    Nuclear fission, subdivision of a heavy atomic nucleus, such as that of uranium or plutonium, into two fragments of roughly equal mass The process is accompanied by the release of a large amount of energy
  • Nuclear Fission Definition and Examples - Science Notes and . . .
    In nuclear fission, the nucleus of a heavy atom, such as uranium or plutonium, splits into two or more smaller nuclei, along with a few neutrons and a significant amount of energy
  • Nuclear Fission | Definition, Reaction Examples | nuclear . . .
    Nuclear fission is a nuclear reaction or a decay process, in which the heavy nucleus splits into smaller parts (lighter nuclei) The fission process often produces free neutrons and photons (in the form of gamma rays) and releases a large amount of energy
  • What Is Nuclear Fission? The Physics Behind Atomic Power
    Nuclear fission is the process by which the nucleus of an atom splits into two or more smaller nuclei, accompanied by the release of a large amount of energy This seemingly simple event lies at the heart of nuclear reactors and atomic bombs
  • The Fission Process – MIT Nuclear Reactor Laboratory
    When a U-235 nucleus absorbs an extra neutron, it quickly breaks into two parts This process is known as fission (see diagram below) Each time a U-235 nucleus splits, it releases two or three neutrons Hence, the possibility exists for creating a chain reaction The MIT Research Reactor is used primarily for the production of neutrons
  • FISSION Definition Meaning - Merriam-Webster
    Most atoms do not fission, but the isotopes of certain elements, such as uranium-235, are fissile Washington Post, 28 Apr 2022 Anyone can see that fissioning uranium 235 or plutonium can be used to generate electricity
  • DOE Explains. . . Nuclear Fission - Department of Energy
    Nuclear fission is the process where the nucleus of an atom splits into two or more smaller nuclei and other particles These particles can include neutrons, alpha particles (helium nuclei), beta particles (electrons), and gamma rays (which consist of particles of light, or photons)
  • What is Fission? - Live Science
    Fission is the process by which an atom splits into two, generating two smaller atoms and a tremendous amount of energy Fission powers nuclear bombs and power plants





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