spallation

spallation
/spaw lay"sheuhn/, n. Physics.
a nuclear reaction in which several nucleons are released from the nucleus of an atom.
[1945-50; SPALL + -ATION]

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      high-energy nuclear reaction in which a target nucleus struck by an incident (bombarding) particle of energy greater than about 50 million electron volts (MeV) ejects numerous lighter particles and becomes a product nucleus correspondingly lighter than the original nucleus. The light ejected particles may be neutrons, protons, or various composite particles equivalent to nuclei of hydrogen, helium, or lithium isotopes. The product nucleus is occasionally much lighter than the target nucleus; chlorine-38, for example, has been produced along with an assortment of neutrons, protons, and alpha particles (helium nuclei) by bombarding copper-63 with protons accelerated to 70 MeV.

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Universalium. 2010.

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  • spallation — [spô lā′shən] n. [< SPALL] a nuclear reaction produced by high energy projectiles in which two or more fragments or particles, as neutrons or protons, are ejected from the target nucleus …   English World dictionary

  • Spallation — La spallation nucléaire[1](de l anglais to spall, produire des éclats) est une réaction nucléaire dans laquelle un noyau atomique est frappé par une particule incidente (neutron, proton, ...) ou une onde électromagnétique de grande énergie (à… …   Wikipédia en Français

  • Spallation — In general, spallation is a process in which fragments of material (spall) are ejected from a body due to impact or stress. In nuclear physics, it is the process in which a heavy nucleus emits a large number of nucleons as a result of being hit… …   Wikipedia

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  • Spallation — Spal|la|ti|on [engl. = Zersplitterung]; Syn.: Kernzertrümmerung, Vielfachzerlegung: beim Beschuss von Atomkernen mit energiereichen Teilchen eintretende u. unter Emission zahlreicher Nukleonen, insbes. von Neutronen, ablaufende ↑ Kernreaktion. *… …   Universal-Lexikon

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