/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.

Look at other dictionaries:

  • SPALLATION — SPALLATI Réaction nucléaire à haute énergie dans laquelle un noyau cible frappé par une particule incidente d’énergie supérieure à environ 50 millions d’électrons volts (MeV) émet un jet de particules plus légères et produit un noyau dont la… …   Encyclopédie Universelle

  • Spallation — (von engl. to spall „absplittern“) ist eine nichtelastische Wechselwirkung eines Atomkerns mit einem Projektil (Neutron, Proton, einem anderen Kern oder einem Elementarteilchen) hoher kinetischer Energie (> 100 MeV). Der Atomkern… …   Deutsch Wikipedia

  • 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

  • Spallation — skaldymas statusas T sritis fizika atitikmenys: angl. spallation vok. Absplitterung, f; Spallation, f; Vielfachzerlegung, f rus. глубокое отщепление, n; скалывание, n pranc. éclatement, m; spallation, f …   Fizikos terminų žodynas

  • 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

  • Spallation — skaidymas statusas T sritis ekologija ir aplinkotyra apibrėžtis Sudėtingos medžiagos ardymas, kai ji virsta paprastesnės sandaros medžiaga. atitikmenys: angl. spallation vok. Spallation, f rus. расщепление, n; скалывание, n …   Ekologijos terminų aiškinamasis žodynas

  • spallation — 1. SYN: fragmentation. 2. Nuclear reaction in which nuclei, on being bombarded by high energy particles, liberate a number of protons and alpha particles. [M.E. spalle, fragment] * * * spal·la·tion (spaw laґshən) splintering; the process of… …   Medical dictionary

  • Spallation — Spal|la|ti|on die; , en <aus gleichbed. engl. spallation zu to spall »(sich) abspalten«> Herauslösung von Nukleonen aus dem Atomkern nach Auftreffen von energiereicher Teilchenstrahlung, Kernzertrümmerung (Kernphys.) …   Das große Fremdwörterbuch

  • spallation — noun Date: 1947 1. a nuclear reaction in which light particles are ejected as the result of bombardment (as by high energy protons) 2. the process of spalling …   New Collegiate Dictionary

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