how is fission reaction started


Nuclear fission - Wikipedia, the free encyclopedia

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** Nuclear fission **

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"Splitting the atom" redirects here. For the EP, see Splitting the Atom.
An induced fission reaction. A neutron is absorbed by a uranium-235
nucleus, turning it briefly into an excited uranium-236 nucleus, with the
excitation energy provided by the kinetic energy of the neutron plus the
forces that bind the neutron. The uranium-236, in turn, splits into
fast-moving lighter elements (fission products) and releases three free
neutrons. At the same time, one or more "prompt gamma rays" (not shown) are
produced, as well.

Nuclear physics
NuclearReaction.png
Nucleus  *·* Nucleons (p, n) *·* Nuclear force  *·* Nuclear
structure  *·* Nuclear reaction
Nuclear models and stability
Liquid drop *·* Nuclear shell *·* Nuclear structure
Binding energy *·* p–n ratio *·* Drip line *·* Stability
Isl.
Nuclides' classification
Isotopes – equal /Z/
Isobars – equal /A/
Isotones – equal /N/
Isodiaphers – equal /N/ âˆ’ /Z/
     Isomers – equal all the above
Mirror nuclei â€“ /Z/ ↔ /N/
Stable *·* Magic *·* Even/odd *·* Halo
Radioactive decay
Alpha Î± *·* Beta Î² (2β, β^+) *·*
K/L capture *·* Isomeric (Gamma γ *·* Internal
conversion) *·* Spontaneous fission *·* Cluster decay *·*
Neutron emission *·* Proton emission
Decay energy *·* Decay chain *·* Decay product *·* Radiogenic
nuclide
*Nuclear fission*
Spontaneous *·* Products (pair breaking) *·* Photofission
Capturing processes
electron *·* neutron (s *·* r) *·* proton (p *·* rp)
High energy processes
Spallation (by cosmic ray) *·* Photodisintegration
Nucleosynthesis topics
Nuclear fusion
Processes: Stellar *·* Big Bang *·* Supernova
Nuclides: Primordial *·* Cosmogenic *·* Artificial
Scientists
Becquerel *·* Davisson *·* Bethe *·*
Skłodowska-Curie *·* Pi.Curie *·* Fr.Curie *·*
Ir.Curie *·* Fermi *·* Oppenheimer *·* Rutherford *·*
Thomson  *·* Chadwick *·* Oliphant *·* Szilárd  *·*
Teller *·* Lawrence *·* Proca *·* Mayer *·* Jensen *·*
Alvarez *·* Soddy *·* Rabi *·* Meitner *·*
Strassmann *·* Hahn *·* Purcell *·* Walton *·*
Cockcroft *·*
· v
· t
· e

In nuclear physics and nuclear chemistry, *nuclear fission* is either a
nuclear reaction or a radioactive decay process in which the nucleus of an
atom splits into smaller parts


Source: en.wikipedia.org/wiki/Nuclear_fission

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