positron-electron annihilation

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• 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

• 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

• 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

• 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 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

• 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 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

• Positron — (e+) Klassifikation Elementarteilchen Fermion Lepton Eigenschaften Ladung 1 e Masse …   Deutsch 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 — /poz i tron /, n. Physics. an elementary particle having the same mass and spin as an electron but having a positive charge equal in magnitude to that of the electron s negative charge; the antiparticle of the electron. Also called antielectron,… …   Universalium