File:Annihilation.png
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Summary
DescriptionAnnihilation.png |
English: 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. Español: Esquema de una aniquilación electrón-positrón Français : Image du processus "d'annihilation" connu en physique élémentaire. Elle montre comment un positron (e+) est émis par le noyau atomique en même temps qu'un neutrino (v). Le positron se déplace ensuite de manière aléatoire dans la matière environnante où il heurte plusieurs électrons différents (e-) jusqu'à ce qu'il perde finalement assez d'énergie pour interagir avec un seul électron. Ce processus est appelé "annihilation" et donne lieu à l'émission de deux photons diamétralement opposés d'une énergie typique de 511 keV chacun. Cependant, veuillez noter que dans des circonstances normales, les photons ne sont pas émis de manière exactement diamétrale (180 degrés). Cela est dû à l'énergie restante du positron et donc à la conservation du momentum. |
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Date | ||||
Source |
own work - part of PhD thesis |
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Author | Jens Maus (http://jens-maus.de/) | |||
Permission (Reusing this file) |
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Items portrayed in this file
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July 2009
image/png
f7b2f0f9785fd2cac92678e08731d538b48756c7
190,307 byte
1,116 pixel
2,266 pixel
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:15, 25 August 2014 | 2,266 × 1,116 (186 KB) | Damato | Taken updated image from my PhD thesis (http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-23509) which is slightly coloured. | |
10:25, 4 December 2007 | 1,117 × 575 (42 KB) | Damato | New version uploaded with legend and transparency | ||
21:25, 20 October 2005 | 358 × 273 (15 KB) | Damato | Image of the "annihilation" process known in elementary physics. It shows how a positron (e+) is emitted from the atomic nucleus together with a neutron. The positron moves then randomly through the surrounding matter where it hits several different elect |
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