Antihidrogen: Perbedaan antara revisi
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'''Antihidrogen''' adalah [[antimateri]] dari [[hydrogen]]. Sementara [[atom]] hidrogen biasa terdiri dari [[elektron]] dan [[proton]], atom antihidrogen terdiri dari [[positron]] dan [[antiproton]].
[[Lambang kimia]] yang diajukan untuk mewakilinya adalah
[[Berkas:3D image of Antihydrogen.jpg|thumb|left|Satu atom antihidrogen terdiri dari sebuah [[antiproton]] dan sebuah [[positron]]]]
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== Pembuatan ==
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In 1995, the [[CERN]] laboratory in [[Geneva]] first produced antihydrogen in the [[Low Energy Antiproton Ring|LEAR]] by shooting antiprotons, which were produced in a [[particle accelerator]], at [[xenon]] [[Cluster (physics)|clusters]]. When an antiproton gets close to a xenon nucleus, an electron-positron-pair can be produced, and with some probability the positron will be captured by the antiproton to form antihydrogen. The probability for producing antihydrogen from one antiproton was only about {{val|e=-19}}, so this method is not well suited for the production of substantial amounts of antihydrogen,<ref name="first-AH">{{cite journal
|title=Production of Antihydrogen
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In an experiment carried out by the [[ATRAP]] and [[ATHENA]] collaborations at CERN, positrons from a [[sodium]] [[radioactive]] source and antiprotons were brought together in a magnetic [[Penning trap]], where synthesis took place at a typical rate of 100 antihydrogen atoms per second. Antihydrogen was first produced by these two collaborations in 2002, and by 2004 perhaps a hundred thousand antihydrogen atoms were produced in this way.
The antihydrogen atoms synthesized so far have had a very high temperature (a few thousand [[kelvin]]s), thus hitting the walls of the experimental apparatus as a consequence and annihilating. A potential solution to this problem would be to produce antihydrogen atoms at such a low temperature (perhaps a fraction of a kelvin) that they can be captured in a [[magnetic trap]] or a [[combined rf trap]].
Simultaneous trapping of antiprotons and antielectrons have been reported,<ref name="both">{{cite journal
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