Elektron-positron annihilation
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Naturligt forekommende elektron-positron annihilation (til venstre) som resultat af et beta-plus henfald i atomkernen (til højre). Positronens vej er vist med grønne streger fra venstre mod højre.
elektron-positron annihilation er en kvantemekanisk annihilation, hvorunder masse, i form af en elektron og en positron indfanges af hinanden, omdannes til elektromagnetisk energi, hvor en foton med tilstrækkelig lav bølgelængde dannes.
(Den modsatte proces af elektron-positron annihilation er pardannelse.)
Se også
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Annihilation.png
Image of the "annihilation" process known in elementary physics. It shows how a positron (e+) is emitted from the atomic nucleus together with a neutrino (v). The positron moves then randomly through the surrounding matter where it hits several different electrons (e-) until it finally loses enough energy that it interacts with a single electron. This process is called an "annihilation" and results in two diametrically emitted photons with a typical energy of 511 keV each. However, please note that under normal circumstances the photons are not emitted exactly diametrically (180 degrees). This is due to the remaining energy of the positron and therefore of the conservation of momentum.
Image of the "annihilation" process known in elementary physics. It shows how a positron (e+) is emitted from the atomic nucleus together with a neutrino (v). The positron moves then randomly through the surrounding matter where it hits several different electrons (e-) until it finally loses enough energy that it interacts with a single electron. This process is called an "annihilation" and results in two diametrically emitted photons with a typical energy of 511 keV each. However, please note that under normal circumstances the photons are not emitted exactly diametrically (180 degrees). This is due to the remaining energy of the positron and therefore of the conservation of momentum.
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Nuclear physics
Nuclear physics