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Neutron emission is a mode of radioactive decay in which one or more neutrons are ejected from a nucleus. It occurs in the most neutron-rich/proton-deficient nuclides, and also from excited states of other nuclides as in photoneutron emission and beta-delayed neutron emission. As only a neutron is lost by this process the number of protons remains unchanged, and an atom does not become an atom of a different element, but a different isotope of the same element.
Neutrons are also produced in the spontaneous and induced fission of certain heavy nuclides.
Neutronemission is a mode of radioactive decay in which one or more neutrons are ejected from a nucleus. It occurs in the most neutron-rich/proton-deficient...
isobar of that nuclide. For example, beta decay of a neutron transforms it into a proton by the emission of an electron accompanied by an antineutrino; or...
radionuclide nucleus is converted into a neutron while releasing a positron and an electron neutrino (νe). Positron emission is mediated by the weak force. The...
engineering, a prompt neutron is a neutron immediately emitted (neutronemission) by a nuclear fission event, as opposed to a delayed neutron decay which can...
neutrons as an additional decay particle, so called beta-delayed neutronemission. Neutronemission usually happens from nuclei that are in an excited state,...
emission of the prompt neutrons. Hence the neutron that originates from the precursor's decay is termed a delayed neutron. The "delay" in the neutron...
inside stars if the neutron flux density is so high that the atomic nucleus has no time to decay via beta emission between neutron captures. The mass number...
The neutron is a subatomic particle, symbol n or n0 , which has a neutral (not positive or negative) charge, and a mass slightly greater than that of...
nuclei are unbound with respect to the emission of a proton or neutron. An arbitrary combination of protons and neutrons does not necessarily yield a stable...
A neutron star is a collapsed core of a massive supergiant star. The stars that later collapse into neutron stars have a total mass of between 10 and...
200 kV to prevent field emission. In comparison with radionuclide neutron sources, neutron tubes can produce much higher neutron fluxes and consistent (monochromatic)...
because neutrons have no charge. However, neutron interactions are largely ionizing, for example when neutron absorption results in gamma emission and the...
(SF) with emission of neutrons. The most common spontaneous fission source is the isotope californium-252. 252Cf and all other SF neutron sources are...
high atomic number, alpha emission (orange) or spontaneous fission (dark blue) become common decay modes. The protons and neutrons that comprise an atomic...
Bagieu G, Bouchez J, Cavaignac JF, Collot J, et al. (1990), "Limits on neutronemission following deuterium absorption into palladium and titanium", Phys....
Reactions with neutrons are important in nuclear reactors and nuclear weapons. While the best-known neutron reactions are neutron scattering, neutron capture...
actinides. Neutronemission occurs in situations in which a nucleus contains enough excess neutrons that the separation energy of one or more neutrons becomes...
(the core is no longer a critical mass). Therefore, low spontaneous neutronemission of the pit material is crucial. For boosted fission weapons, the size...
the nucleus of a helium-4 atom, which consists of two protons and two neutrons. It has a charge of +2 e and a mass of 4 Da. For example, uranium-238 decays...
average time from a neutronemission to a capture that results in fission. The mean generation time is different from the prompt neutron lifetime because...
of atoms characterized by their number of protons, Z, their number of neutrons, N, and their nuclear energy state. The word nuclide was coined by the...
expected to decay by prompt proton emission (much like the diproton, 2 He ). Lithium-4 contains three protons and one neutron. It is the shortest-lived known...
rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles. This radiation can be observed only when a beam of emission is...
hydrogen-4 was deduced by detecting the emitted protons. It decays through neutronemission into hydrogen-3 (tritium) with a half-life of 139(10) ys (or 1.39(10)×10−22 s)...
only claimed neutronemission from the initial bubble collapse following bubble nucleation, whereas this report claimed neutronemission many acoustic...
hand, carbon-14 decays by beta decay, whereby one neutron is transmuted into a proton with the emission of an electron and an antineutrino. Thus the atomic...
emission of a gamma ray from an excited nucleus typically requires only 10−12 seconds. Gamma decay may also follow nuclear reactions such as neutron capture...
(approximately 7 MeV), when photon emission becomes competitive. Below the neutron separation energy, gamma emission is dominant, characterised by a disordered...
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