contributing to the binding of neutrons and protons of the atomic nucleus was not actually detected until 1947, while the existence of the neutrino was not confirmed until 1956. The so-called mesotron of beta radioactive decay eventually became known as the W- particle and was not detected until 1981. Thus the description of these subatomic processes on p. 479 of the book, even though partially taken from Sheppard's 1940 paper, still remain quite remarkable.

References

Sheppard, C. W. "The Evanescent Mesotron." Scientific American, October 1940
Swann,  W.F.G. (1934) "The Architecture of the Universe."
Yukawa, H. Tabito, 190. (World Scientific, Singapore, 1982)
Weinberg, S. "Dreams of a Final Theory." (Pantheon Books, N.Y. 1992)

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