JUNE 1956

THE ANTIPROTON--"Since it was apparent that creation of the antiproton required tremendous energy, the most likely place to look for it was in cosmic rays. On a few occasions investigators found events which seemed to signal the generation of an antiproton, but there was never sufficient information to identify it with certainty. When the Bevatron at the University of California began to bombard a target made of copper with six-Bev (billion electron volts) protons, the next problem was to detect and identify any antiprotons created. A plan for the search was devised by Owen Chamberlain, Thomas Ypsilantis and the authors of this article. Tracks of about 20 antiprotons have now been detected in emulsions by observers in Berkeley. --Emilio Segrè and Clyde E. Wiegand" [Editors' note: Emilio Segrè won a Nobel Prize in Physics in 1959.]

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