exotic atom


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exotic atom

[ik¦säd·ik ′ad·əm]
(atomic physics)
A system in which either the proton that forms the nucleus of a hydrogen atom is replaced by another particle (such as a muon, to form muonium, or a positron, to form positronium), one electron in an ordinary atom is replaced by another particle (such as a muon, pion, or antiproton), or both substitutions are made (as in antihydrogen).
References in periodicals archive ?
It is possible to define the unmatter in a more general way, using the exotic atom.
From the exotic atom, the pionium, positronium, protonium, antiprotonic helium, and muonium are unmatter.
Washington, May 9 ( ANI ): A team of physicists has found the first direct evidence of pear shaped nuclei in exotic atoms.