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- Neutron_emission abstract "Neutron emission is a type of radioactive decay of atoms containing excess neutrons, in which a neutron is simply ejected from the nucleus. Two examples of isotopes which emit neutrons are beryllium-13 (mean life 2.7×10−21 s) and helium-5 (7×10−22 s). Neutron emission usually happens from nuclei that are in an excited state, such as the excited O-17* produced from the beta decay of N-17. The neutron emission process itself is controlled by the nuclear force and therefore is extremely fast, sometimes referred to as "nearly instantaneous". The ejection of the neutron may be as a product of the movement of many nucleons, but it is ultimately mediated by the repulsive action of the nuclear force that exists at extremely short-range distances between nucleons. The life time of an ejected neutron inside the nucleus before it is emitted is usually comparable to the flight time of a typical neutron before it leaves the small nuclear "potential well", or about 10−23 seconds. A synonym for such neutron emission is "prompt neutron" production, of the type that is best known to occur simultaneously with induced nuclear fission. Many heavy isotopes, most notably californium-252, also emit prompt neutrons among the products of a similar spontaneous radioactive decay process, spontaneous fission.Most neutron emission outside prompt neutron production associated with fission (either induced or spontaneous), is from neutron-heavy isotopes produced as fission products. These neutrons are sometimes emitted with a delay, giving them the term delayed neutrons, but the actual delay in their production is a delay waiting for the beta decay of fission products to produce the excited-state nuclear precursors that immediately undergo prompt neutron emission. Thus, the delay in neutron emission is not from the neutron-production process, but rather its precursor beta decay which is controlled by the weak force, and thus requires a far longer time. The beta decay half lives for the precursors to delayed neutron-emitter radioisotopes, are typically fractions of a second to tens of seconds. Nevertheless, the delayed neutrons emitted by neutron-rich fission products aid control of nuclear reactors by making reactivity change far more slowly than it would if it were controlled by prompt neutrons alone.".
- Neutron_emission wikiPageExternalLink livechart.
- Neutron_emission wikiPageExternalLink queryensdf.
- Neutron_emission wikiPageID "391283".
- Neutron_emission wikiPageRevisionID "578074480".
- Neutron_emission hasPhotoCollection Neutron_emission.
- Neutron_emission subject Category:Neutron.
- Neutron_emission subject Category:Nuclear_physics.
- Neutron_emission subject Category:Radioactivity.
- Neutron_emission comment "Neutron emission is a type of radioactive decay of atoms containing excess neutrons, in which a neutron is simply ejected from the nucleus. Two examples of isotopes which emit neutrons are beryllium-13 (mean life 2.7×10−21 s) and helium-5 (7×10−22 s). Neutron emission usually happens from nuclei that are in an excited state, such as the excited O-17* produced from the beta decay of N-17.".
- Neutron_emission label "Emisja neutronu".
- Neutron_emission label "Neutron emission".
- Neutron_emission label "Neutronenemission".
- Neutron_emission label "Émission de neutron".
- Neutron_emission label "Нейтронный распад".
- Neutron_emission label "إصدار نيوتروني".
- Neutron_emission label "中子發射".
- Neutron_emission label "中性子放出".
- Neutron_emission sameAs Vyzáření_neutronu.
- Neutron_emission sameAs Neutronenemission.
- Neutron_emission sameAs Émission_de_neutron.
- Neutron_emission sameAs 中性子放出.
- Neutron_emission sameAs 중성자_방출.
- Neutron_emission sameAs Emisja_neutronu.
- Neutron_emission sameAs m.022r49.
- Neutron_emission sameAs Q898923.
- Neutron_emission sameAs Q898923.
- Neutron_emission wasDerivedFrom Neutron_emission?oldid=578074480.
- Neutron_emission isPrimaryTopicOf Neutron_emission.