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Qu'est-ce (qui) est nuclear fission - définition
Nuclear fission
![Animation of a [[Coulomb explosion]] in the case of a cluster of positively charged nuclei, akin to a cluster of fission fragments. [[Hue]] level of color
is proportional to (larger) nuclei charge. Electrons (smaller) on this time-scale are seen only stroboscopically and the hue level is their kinetic energy](https://commons.wikimedia.org/wiki/Special:FilePath/Bucky1.gif?width=200 "Animation of a [[Coulomb explosion]] in the case of a cluster of positively charged nuclei, akin to a cluster of fission fragments. [[Hue]] level of color
is proportional to (larger) nuclei charge. Electrons (smaller) on this time-scale are seen only stroboscopically and the hue level is their kinetic energy")
![A schematic nuclear fission chain reaction. 1. A [[uranium-235]] atom absorbs a [[neutron]] and fissions into two new atoms (fission fragments), releasing three new neutrons and some binding energy. 2. One of those neutrons is absorbed by an atom of [[uranium-238]] and does not continue the reaction. Another neutron is simply lost and does not collide with anything, also not continuing the reaction. However, the one neutron does collide with an atom of uranium-235, which then fissions and releases two neutrons and some binding energy. 3. Both of those neutrons collide with uranium-235 atoms, each of which fissions and releases between one and three neutrons, which can then continue the reaction.](https://commons.wikimedia.org/wiki/Special:FilePath/Fission chain reaction.svg?width=200 "A schematic nuclear fission chain reaction. 1. A [[uranium-235]] atom absorbs a [[neutron]] and fissions into two new atoms (fission fragments), releasing three new neutrons and some binding energy. 2. One of those neutrons is absorbed by an atom of [[uranium-238]] and does not continue the reaction. Another neutron is simply lost and does not collide with anything, also not continuing the reaction. However, the one neutron does collide with an atom of uranium-235, which then fissions and releases two neutrons and some binding energy. 3. Both of those neutrons collide with uranium-235 atoms, each of which fissions and releases between one and three neutrons, which can then continue the reaction.")
![[[Otto Hahn]] and [[Lise Meitner]] in 1912](https://commons.wikimedia.org/wiki/Special:FilePath/Hahn and Meitner in 1912.jpg?width=200 "[[Otto Hahn]] and [[Lise Meitner]] in 1912")
![website=[[YouTube]] }}</ref> but would not have been together in the same room.](https://commons.wikimedia.org/wiki/Special:FilePath/Nuclear Fission Experimental Apparatus 1938 - Deutsches Museum - Munich.jpg?width=200 "website=[[YouTube]] }}</ref> but would not have been together in the same room.")
![The [[cooling tower]]s of the [[Philippsburg Nuclear Power Plant]], in [[Germany]].](https://commons.wikimedia.org/wiki/Special:FilePath/Philippsburg2.jpg?width=200 "The [[cooling tower]]s of the [[Philippsburg Nuclear Power Plant]], in [[Germany]].")
![Drawing of the first artificial reactor, [[Chicago Pile-1]].](https://commons.wikimedia.org/wiki/Special:FilePath/Stagg Field reactor.jpg?width=200 "Drawing of the first artificial reactor, [[Chicago Pile-1]].")
![The stages of binary fission in a liquid drop model. Energy input deforms the nucleus into a fat "cigar" shape, then a "peanut" shape, followed by binary fission as the two lobes exceed the short-range [[nuclear force]] attraction distance, then are pushed apart and away by their electrical charge. In the liquid drop model, the two fission fragments are predicted to be the same size. The nuclear shell model allows for them to differ in size, as usually experimentally observed.](https://commons.wikimedia.org/wiki/Special:FilePath/Stdef2.png?width=200 "The stages of binary fission in a liquid drop model. Energy input deforms the nucleus into a fat \"cigar\" shape, then a \"peanut\" shape, followed by binary fission as the two lobes exceed the short-range [[nuclear force]] attraction distance, then are pushed apart and away by their electrical charge. In the liquid drop model, the two fission fragments are predicted to be the same size. The nuclear shell model allows for them to differ in size, as usually experimentally observed.")
![Fission product yields by mass for [[thermal neutron]] fission of [[uranium-235]], [[plutonium-239]], a combination of the two typical of current nuclear power reactors, and [[uranium-233]] used in the [[thorium cycle]].](https://commons.wikimedia.org/wiki/Special:FilePath/ThermalFissionYield.svg?width=200 "Fission product yields by mass for [[thermal neutron]] fission of [[uranium-235]], [[plutonium-239]], a combination of the two typical of current nuclear power reactors, and [[uranium-233]] used in the [[thorium cycle]].")
A NUCLEAR REACTION SPLITTING AN ATOM INTO MULTIPLE PARTS
Thermonuclear fission; Nuclear Fission; Nuclearfission; Fission reaction; Splitting the atom; Nuclear fision; Splitting of the atom; Fission explosions; Split the atom; Atomic fission; Electromagnetic induced fission; Electromagnetic Induced fission; Induced fission
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.
Natural nuclear fission reactor
NATURALLY OCCURRING URANIUM DEPOSIT WHERE SELF-SUSTAINING NUCLEAR CHAIN REACTIONS HAVE OCCURRED
Oklo Fossil Reactors; Natural reactor; Natural reactors; Oklo phenomenon; Oklo natural reactor; Natural nuclear reactor; Natural nuclear fission; Natural fission; Georeactor; Fossil nuclear reactors; Natural fission reactor; Fossil fission reactor; Fossil nuclear fission reactor; Oklo fission reactor; Oklo fission reactors; Oklo fossil reactors; Oklo fossil reactor
A natural nuclear fission reactor is a uranium deposit where self-sustaining nuclear chain reactions occur. The conditions under which a natural nuclear reactor could exist had been predicted in 1956 by Japanese American chemist Paul Kuroda.
Nuclear fission product
PRODUCT OF NUCLEAR FISSION
Fission products; Radioactive product; Mae West curve; Fission product; Nuclear fission products; Fission fragment; Fissiogenic
Nuclear fission products are the atomic fragments left after a large atomic nucleus undergoes nuclear fission. Typically, a large nucleus like that of uranium fissions by splitting into two smaller nuclei, along with a few neutrons, the release of heat energy (kinetic energy of the nuclei), and gamma rays.
Exemples du corpus de texte pour nuclear fission
1. A replacement generation of nuclear fission power stations would add only 10% to our existing stocks.
2. Article continues We need emission–free energy sources immediately, and there is no serious contender to nuclear fission.
3. I believe it‘s a good idea to hedge our resources on the other viable resources: nuclear fission, wind and solar.
4. In the long–term, they could develop hydrogen nanotechnologies, next–generation nuclear fission and fusion energy, it said.
5. Areas for mid– to long–term collaboration include hydrogen, nanotechnologies, advanced biotechnologies, next–generation nuclear fission and fusion energy.