For the isotope 1H and the corresponding hydrated ion, see Protium and Hydronium.
Protonium (symbol: Pn)[citation needed], also known as antiprotonic hydrogen, is a type of exotic atom in which a proton (symbol: p) and an antiproton (symbol: p) are bound to each other.[1]
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.[2]
Like all onia, protonium is a boson with all quantum numbers (baryon number, flavour quantum numbers, etc.) and electrical charge equal to 0.
^Zurlo, N.; et al. (2006). "Production Of Slow Protonium In Vacuum". Hyperfine Interactions. 172 (1–3): 97–105. arXiv:0801.3193. Bibcode:2006HyInt.172...97Z. doi:10.1007/s10751-007-9529-0. S2CID 119182686.
^Abdel-Raouf, Mohamed Assad (2009). "Binding energy of protonium ions". Journal of Physics: Conference Series. 194 (7): 072003. Bibcode:2009JPhCS.194g2003A. doi:10.1088/1742-6596/194/7/072003.
Protonium (symbol: Pn)[citation needed], also known as antiprotonic hydrogen, is a type of exotic atom in which a proton (symbol: p) and an antiproton...
interesting for exploring the strong interaction. This should also be true of protonium. The true analogs of positronium in the theory of strong interactions...
should also be true of protonium, which is a proton–antiproton bound state. Understanding bound states of pionium and protonium is important in order to...
element tennessine: see above) Vi: vinyl Exotic atoms: Mu: muonium Pn: protonium Ps: positronium Hazard pictographs are another type of symbols used in...
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