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accepted as decaying anti-particle Anti-protons antiparticle atomic mass units Atomic Physics Berkeley in 1955 binding energy Bohr Magneton Bristol Group Chadwick charged particles charged secondary probably cloud chamber cloud-chamber and emulsion cloud-chambers and nuclear collisions cosmic radiation cosmic rays decay at rest decay scheme decaying in vacuo deuteron Dirac theory discovery discrete energy disintegration electric charge electromagnetic field electron volts emission emitted energy levels excitation energies existence explained by assuming fundamental particles half-life Heavy Mesons high energy hydrogen atom hyperons form Identified from decays J.J. Thomson K-mesons kinetic and excitation magnetic mean lifetime mesons and hyperons microseconds modes of decay momentum mu-mesons negative mesons neutral particle neutrino nuclear emulsions nuclear magneton Nuclear Physics nuclei nucleons number of events observed in cloud-chambers Pic du midi positron predicted produced Professor C.F. POWELL properties proton protons and neutrons reactions leading rest mass simultaneous production stable theoretical grounds uncharged unstable particles velocity Yukawa