Word: barytron
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Dates: during 1940-1949
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...intermediate particle, apparently created about ten miles up in the air by cosmic ray impacts, and its existence was also vouched for by Street & Stevenson of Harvard. The particle was variously called the "X-particle," the "heavy electron"' (a misnomer, since it was not an electron), the "barytron" (also a misnomer, because it means "heavy particle," whereas the particle is lighter than a proton). A name meaning "intermediate particle" was clearly in order, and so practically all U. S. physicists now call it the "mesotron" or "meson...