Forskel mellem versioner af "Annihilation"

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'''Annihilation''' beskriver i fysikken den proces, som sker når en [[subatomar partikel]] kollidere med den [[antipartikel]].<ref>{{cite web | url=http://www.lbl.gov/abc/Antimatter.html | title=Antimatter | author=Nuclear Science Division ---- [[Lawrence Berkeley National Laboratory]] | accessdate=09-03-2008| archiveurl= http://web.archive.org/web/20080823180515/http://www.lbl.gov/abc/Antimatter.html| archivedate= 23 August 2008 <!--DASHBot-->| deadurl= no}}</ref>
[[File:Mutual Annihilation of a Positron Electron pair.svg|200px|thumb|right|Et [[Feynman diagram]] showing the mutual annihilation of a bound state [[electron]] [[positron]] pair into two photons. This bound state is more commonly known as [[positronium]]]]
'''Annihilation''' is defined as "total destruction" or "complete obliteration" of an object;<ref> [http://dictionary.reference.com/search?r=2&q=Annihilation - Dictionary Definition] (2006) Dictionary.com.</ref> having its root in the Latin ''nihil'' (nothing). A literal translation is "to make into nothing".
 
In [[physics]], the word is used to denote the process that occurs when a [[subatomic particle]] collides with its respective [[antiparticle]].<ref>{{cite web | url=http://www.lbl.gov/abc/Antimatter.html | title=Antimatter | author=Nuclear Science Division ---- [[Lawrence Berkeley National Laboratory]] | accessdate=09-03-2008| archiveurl= http://web.archive.org/web/20080823180515/http://www.lbl.gov/abc/Antimatter.html| archivedate= 23 August 2008 <!--DASHBot-->| deadurl= no}}</ref> Since energy and momentum must be conserved, the particles are not actually made into nothing, but rather into new particles. Antiparticles have exactly opposite additive [[quantum number]]s from particles, so the sums of all quantum numbers of the original pair are zero. Hence, any set of particles may be produced whose total quantum numbers are also zero as long as [[conservation of energy]] and [[conservation of momentum]] are obeyed. When a particle and its antiparticle collide, their energy is converted into a force carrier particle, such as a gluon, W/Z force carrier particle, or a photon. These particles are afterwards transformed into other particles.<ref name=Particleadventure.org>{{cite web|title=The Standard Model – Particle decays and annihilations|url=http://particleadventure.org/eedd.html|work=The Particle Adventure: The Fundamentals of Matter and Force|publisher=berkeley Lab|accessdate=17 October 2011}}</ref>
 
During a low-energy annihilation, [[photon]] production is favored, since these particles have no mass. However, high-energy [[particle collider]]s produce annihilations where a wide variety of exotic heavy particles are created.
==Fodnoter==
{{reflist}}
==SeeSe alsoogså==
*[[ParproductionParproduktion]]
*[[Electron-positron annihilation]]
*[[Proton-antiproton annihilation]]
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