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ⓘ Exotic atom. An exotic atom is an atom that has a particle replaced by a particle of the same charge. For example, Positronium, an exotic atom, contains an elec ..




                                     

ⓘ Exotic atom

An exotic atom is an atom that has a particle replaced by a particle of the same charge. For example, Positronium, an exotic atom, contains an electron and a positron. The positron replaces a proton which would normally be found in that atom. Most exotic atoms are hard to discover, because they decay very quickly. Positronium on average has a half-life of 0.125 nanoseconds. There are a few types of exotic atom.

                                     

1. Muonic atom

A muonic atom is an exotic atom that has a muon, instead of an electron, orbiting the nucleus. Because a muon is much more massive than an electron, the muon orbits much closer to the nucleus.

                                     

2. Hadronic atom

A hadronic atom is an exotic atom that has an electron replaced by a negatively charged hadron. The hadron could be a meson. Another hadronic atom is an antiproton antiparticle of the proton atom, that has an antiproton replacing an electron. This is known as an antiprotonic atom.