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antineutron"The neutron's antiparticle, first observed in 1956.
Cork, B., G. R. Lambertson, O. Piccioni, and W. A. Wenzel, 1956: Phys. Rev., 104, 1193-1197.
But sometimes by particle, without qualification, is meant a subatomic particle such as the proton or neutron (which themselves are composed of other "elementary particles") or the electron. See also particles.
 See also: Meteor, Electron, Thunderstorms, Thunderstorm, Thunder
  
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