File:Annihilation.png

From Wikiversity
Jump to navigation Jump to search

Original file ‎(2,266 × 1,116 pixels, file size: 186 KB, MIME type: image/png)

This is a file from the Wikimedia Commons. The description on its description page there is shown below.

Commons is a freely licensed media file repository. You can help.

Summary

Description
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.
Date
Source

own work - part of PhD thesis

Author Jens Maus (http://jens-maus.de/)
Permission
(Reusing this file)
Public domain This work has been released into the public domain by its author, I, Jens Maus. This applies worldwide.
In some countries this may not be legally possible; if so:
I, Jens Maus grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

inception

July 2009

MIME type

image/png

checksum

f7b2f0f9785fd2cac92678e08731d538b48756c7

determination method: SHA-1

data size

190,307 byte

height

1,116 pixel

width

2,266 pixel

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current13:15, 25 August 2014Thumbnail for version as of 13:15, 25 August 20142,266 × 1,116 (186 KB)DamatoTaken 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 2007Thumbnail for version as of 10:25, 4 December 20071,117 × 575 (42 KB)DamatoNew version uploaded with legend and transparency
21:25, 20 October 2005Thumbnail for version as of 21:25, 20 October 2005358 × 273 (15 KB)DamatoImage 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

Global file usage

The following other wikis use this file:

Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.

If the file has been modified from its original state, some details may not fully reflect the modified file.

Retrieved from "https://en.wikiversity.org/wiki/File:Annihilation.png"