1 jan 1932 ano - Carl David Anderson

Descrição:

He discovers antimatter, an antielectron called the positron. American physicist is studying cosmic rays when he notices some tracks on his photographic plates that look exactly like electron tracks except that they are curving in the wrong direction. He realizes that that he has discovered a positively-charged electron, i.e., the antielectron predicted by Dirac. Anderson calls the new particle a positron.

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