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Electron-positron annihilation

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  • Electron-positron annihilation — occurs when an electron and a positron (the electron s anti particle) collide. The result of the collision is the conversion of the electron and positron and the creation of gamma ray photons or, less often, other particles. The process must… …   Wikipedia

  • Positron annihilation spectroscopy — (PAS) [Positrons in Solids, P. Hautojaervi, Topics in Current Physics 12 Springer Heidelberg 1979] or Positron lifetime spectroscopy is a non destructive spectroscopy technique to study voids and defects in solids.The technique relies on the fact …   Wikipedia

  • Large Electron-Positron Collider — The Large Electron Positron Collider (LEP) was one of the largest particle accelerators ever constructed.It was built at CERN, a multi national center for research in nuclear and particle physics near Geneva, Switzerland. LEP was a circular… …   Wikipedia

  • Large Electron–Positron Collider — LEP redirects here. For other uses, see LEP (disambiguation). The former LEP tunnel at CERN being filled with magnets for the LHC The Large Electron–Positron Collider (LEP) was one of the largest particle accelerators ever constructed. It was… …   Wikipedia

  • Annihilation — is defined as total destruction or complete obliteration of an object; [ [http://dictionary.reference.com/search?r=2 q=Annihilation Dictionary Definition] (2006) Dictionary.com.] having its root in the Latin nihil (nothing). A literal translation …   Wikipedia

  • Positron Lifetime Spectroscopy — is a technique in material science used for studying the types and concentrations of atomic sized defects in materials. Positron Sources Typically positrons are produced through Beta Decay. A typical source would be 22Na, sodium 22. Positron… …   Wikipedia

  • Positron — Infobox Particle bgcolour = name = Positron (antielectron) caption = num types = composition = Elementary particle family = Fermion group = Lepton generation = First interaction = Gravity, Electromagnetic, Weak antiparticle = Electron theorized …   Wikipedia

  • ÉLECTRON — L’électron est une particule élémentaire stable. Il possède une charge électrique négative, une très petite masse (près de 2 000 fois plus petite que celle de l’atome le plus léger: l’hydrogène), et un moment angulaire propre appelé spin, auquel… …   Encyclopédie Universelle

  • Positron emission tomography — (PET) is a nuclear medicine imaging technique which produces a three dimensional image or map of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron emitting radionuclide (tracer), which is… …   Wikipedia

  • Électron — Traduction à relire Electron → …   Wikipédia en Français

  • Electron — For other uses, see Electron (disambiguation). Electron Experiments with a Crookes tube first demonstrated the particle nature of electrons. In this illustration, the profile of the cross shaped target is projected against the tube face at right… …   Wikipedia


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