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About: Protonium     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatExoticAtoms, within Data Space : dbpedia.org associated with source document(s)

Type: yago:WikicatAtomsyago:Abstraction100002137yago:Atom114619225yago:Matter100020827yago:Part113809207yago:PhysicalEntity100001930yago:Relation100031921comics characteryago:Substance100019613yago:WikicatExoticAtoms New Facet based on Instances of this Class

Protonium (symbol: Pn), also known as antiprotonic hydrogen, is a type of exotic atom in which a proton (symbol: p) and an antiproton (symbol: p) orbit each other. Since protonium is a bound system of a particle and its corresponding antiparticle, it is an example of a type of exotic atom called an onium. Protonium has a mean lifetime of approximately 1.0 μs and a binding energy of −0.75 keV. Like all onia, protonium is a boson with all quantum numbers (baryon number, flavour quantum numbers, etc.) and electrical charge equal to 0.