Fifty years of antiprotons

CERN

Published 2005 | Version v1

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Fifty years of antiprotons

CERN

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Berkeley physicists Edward McMillan and Edward Lofgren, shown here on the shielding of the Bevatron, were part of the team that was put together by Ernest Lawrence to ensure that the new synchrotron would reach the 6 . 5 GeV needed to produce an antiproton. (All photographs in this article courtesy of Ernest Orlando Lawrence Berkeley National Laboratory.) md5:a1285d82f0228180904694d80e966970	3.1 MB	Preview Download
The team that discovered the antiproton at the Bevatron included, from left to right, Emilio Segrè, Clyde Wiegand, Edward Lofgren, Owen Chamberlain and Thomas Ypsilantis. md5:c89f7deb65b150f586e4b6fed4497283	622.6 kB	Preview Download
In 1955 the newly commissioned Bevatron was the world's most powerful particle accelerator, able to propel protons to energies of about 6 . 5 GeV. md5:7f8a83a54f094d815ac95fdae3ff703c	447.2 kB	Preview Download
the first annihilation star imaged in the photographicemulsion stack experiments, led by Gerson Goldhaber of the Segrè group, which confirmed the discovery of the antiproton. An antiproton enters from the top of the image and travels about 430 pm before meeting a proton. Nine charged particles emerge from the annihilation. md5:3eb1eb2b21e1415accbcc7a2c32f0f0b	183.9 kB	Preview Download
bubble-chamber image where an antiproton enters at the bottom. When it strikes a proton, four positive and four negative pions are created. md5:a35794b036cd6e8f36850347c49ae24d	30.6 kB	Preview Download

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Issued: 2005-11

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Fifty years of antiprotons

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