Word: antineutron
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Dates: during 1960-1969
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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...