1) The act or process of splitting or breaking into parts.
Fission, from L. fissionem "a breaking up, cleaving," from root of findere "to split."
Šekâft, stem of šekâftan "to split, break, tear," akin to kaftan, kâftan "to split; to dig," Parthian Mid.Pers. q'f- "to split;" Sogdian kβ "to split;" Chorasmian kf- "to split, be split;" Proto-Iranian *kap-, *kaf- "to split."
farâvardehâ-ye šekâft (#)
Fr.: produits de fission
Nuclides generated by the fission of higher mass elements or by subsequent radioactive decay of nuclides directly generated by fission.
The material that can be fissioned by fast neutrons, such as uranium-238. Commonly used as a synonym for → fissile material.
šekâft-e darhâzidé, ~ darhâxté
Fr.: fission induite
Fission which takes place when a nucleon is bombarded with neutrons or high-energy radiation (gamma rays).
šekâft-e haste-yi (#)
Fr.: fission nucléaire
A → nuclear reaction in which a heavy atomic nucleus splits into two or more approximately equal parts, usually as the result of the capture of a slow, or → thermal neutron by the nucleus. It is normally accompanied by the emission of further neutrons or → gamma rays and very large amounts of energy. The neutrons can continue the process as a → chain reaction, so that it becomes the source of energy in a → nuclear reactor or an atomic bomb. It may also be a trigger for → nuclear fusion in a hydrogen bomb. Fission occurs spontaneously in nuclei of uranium-235, the main fuel used in nuclear reactors.