Word: chargeless
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Dates: during 1950-1959
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Most of these antiprotons were "annihilated" (turned into energy) when they hit an ordinary positive proton. But occasionally, when an antiproton passed close to an ordinary proton, it merely handed over its negative electric charge. The proton, its positive charge neutralized by a 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...