Word: antineutron
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Dates: during 1956-1956
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...cherished stamps, physicists have now found the last subatomic particle that is needed to make the universe neatly and electrically symmetrical. The Radiation Laboratory of the University of California announced last week that a team of physicists (Drs. Bruce Cork, Glen Lambertson, Oreste Piccioni, William Wenzel) has identified the antineutron, which differs from ordinary neutrons in the opposite direction of its magnetic field...
...negative one, became an ordinary, chargeless neutron. The antiproton, having lost its negative charge and received nothing in return, also became a chargeless particle, but it did not become a normal neutron. Since its basic "anti-ness" was not changed by the loss of its charge, it became an antineutron with a reversed magnetic field. If an antineutron hits a neutron, both turn into energy...
...counting device which measures flashes of energy released by each entering particle. The ordinary neutrons gave small flashes. The mesons gave flashes about twice as strong. Occasional flashes 20 times as strong (2 billion volts) could be only the result of the mutual annihilation of a neutron and an antineutron...