Editing Protonium (section)

==Production==
There are two known methods to generate protonium. One method involves violent particle collisions. The other method involves putting antiprotons and [[proton]]s into the same magnetic cage. The latter method was first used during the experiment [[ATHENA]] (ApparaTus for High precision Experiment on Neutral Antimatter)  at the [[CERN]] laboratory in [[Geneva]] in 2002, but it was not until 2006 that scientists realized protonium was also generated during the experiment.<ref>{{cite journal |url=https://www.openaccessrepository.it/record/136861/files/fulltext.pdf |archive-url=https://web.archive.org/web/20240110154115/https://www.openaccessrepository.it/record/136861/files/fulltext.pdf |url-status=dead |archive-date=January 10, 2024 |title=Protonium production in ATHENA |author=L. Venturelli |display-authors=etal |collaboration=Athena collaboration |journal=[[Nuclear Instruments and Methods in Physics Research Section B]] |volume=261 |issue=1–2 |date=August 2007 |pages=40–43 |doi=10.1016/j.nimb.2007.04.135 |bibcode=2007NIMPB.261...40V}}</ref>

Reactions involving a proton and an antiproton at high energies give rise to many-particle final states. In fact, such reactions are the basis of [[particle collider]]s such as the [[Tevatron]] at [[Fermilab]]. Indirect searches for protonium at [[LEAR]] (Low Energy Antiproton Ring at [[CERN]]) have used antiprotons impinging on nuclei such as [[helium]], with unclear results. Very low energy collisions in the range of 10&nbsp;[[Electronvolt|eV]] to 1&nbsp;[[keV]] may lead to the formation of protonium.