fission
- Domaine
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- physiquephysique atomique et nucléaire
- Date
Définitions :
Partage d'un noyau généralement en deux fragments approximativement égaux; ce processus s'accompagne d'une émission de neutrons et d'un dégagement d'énergie.
Réaction nucléaire au cours de laquelle un noyau se brise en deux parties (rarement plus) en dégageant de l'énergie.
Cassure de l'atome d'un élément lourd avec libération d'énergie.
Note :
La plus importante est la fission induite par neutrons, mais la fission de certains nucléides peut se produire spontanément.
Terme :
- fission n. f.
Traductions
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anglais
Date :Définition
The splitting of a heavy atomic nucleus, either spontaneously or as the consequence of the absorption of a neutron, into two or more lighter, often radioactive nuclei accompagnied by 2 or 3 free neutrons (fission products). These fly apart with enormous force because in the fission process, mass is converted into energy.
A nuclear reaction brought about by direct impact of a neutron upon the uranium isotope (235) or upon the artifical element plutonium (239). This causes the nucleus to split or divide into two fragments (fission products); for example, U - 235 yields radioactive isotopes of barium and krypton.
The splitting of a heavy nucleus into two approximatively equal parts (which are nuclei of lighter elements), accompanied by the release of a relatively large amount of energy and generally one or more neutrons.
The splitting of a nucleus usually into two approximatively equal fragments; the process is accompanied by the emission of neutrons and the release of energy.Notes :
Fission can occur spontaneously, but usually is caused by nuclear absorption of gamma rays, neutrons, or other particles.
Neutron - induced fission is the most important, but fission of certain nuclides may occur spontaneously.Terme :
- fission