Word: antineutron
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...team of Columbia University researchers dispelled the doubts. In the Physical Review Letters, the Columbia scientists reported that they have produced the first complex nucleus of antimatter ever observed-the anti-deuteron. It is the antimatter counterpart to the nucleus of deuterium (heavy hydrogen), consists of an antiproton and antineutron bound by a strong nuclear force, and has a negative charge. Such an achievement, the Columbia researchers conclude, provides strong evidence to support theories about the existence of an antiworld of stars, planets, and possibly even antipeople...
...strange, other-worldly world of antimatter is taking shape in the minds of men. Last week Dr. Emilio Segrè of the University of California showed the first bubble-chamber picture of an anti-neutron-or rather, a place where an antineutron could be proved to have been...
Star of Suicides. Dr. Segrè has no doubt about what happened. The antiproton, he says, hit an ordinary, positively charged proton and reacted with it in such a way that the collision produced one ordinary neutron and one antineutron. These two particles differ only in their magnetic properties. Neither has any electric charge, and therefore they left no bubble trails. The neutron shot out of the picture undetected, but the antineutron hit a carbon atom in the propane and committed double suicide with one of its protons or neutrons. The atom disintegrated, leaving a star of bubble trails made...
...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...