Finding Aid to the Lawrence Berkeley Laboratory Physics Division scientific logbooks of Owen Chamberlain, Emilio Segrè and Clyde Wiegand, 1946-1954Repository:National Archives and Records Administration, Pacific Sierra Region1000 Commodore Drive San Bruno, CA 94066 USA http://www.archives.gov/pacific/san-francisco/ email: sanbruno.archives@nara.gov Publisher:American Institute of Physics Niels Bohr Library & Archives Encoding Information:Machine-readable finding aid encoded by Melanie J. Mueller in 2012. Any revisions made to this finding aid occurred as part of the editing and encoding process. Finding aid is written in English. Description of the CollectionTitle and dates of collection:Lawrence Berkeley Laboratory Physics Division scientific logbooks of Owen Chamberlain, Emilio Segrè and Clyde Wiegand, 1946-1954 Filing code:ARO-2486 Papers created by:Lawrence Berkeley Laboratory. Physics Division Size of collection:1.25 linear feet Short description of collection:These logbooks document the group experiments of Owen Chamberlain, Emilio Segrè and Clyde Wiegand. Language(s) of material:English Selected Search TermsThese papers have been indexed in the International Catalog of Sources for History of Physics and Allied Sciences (ICOS) using the following terms. Those seeking related materials should search under these terms. Historical NoteThe laboratory was founded as the University of California Radiation Laboratory in 1931 by Ernest Orlando Lawrence, a University of California Berkeley physicist who won the 1939 Nobel Prize in physics for his invention of the cyclotron, a circular particle accelerator that opened the door to high-energy physics. It is a United States Department of Energy National Laboratory, operated by the University of California. The name of the laboratory has evolved since its founding: Lawrence Radiation Laboratory (1931-1958), the Lawrence Berkeley Laboratory (1959-1995), and currently the Lawrence Berkeley National Laboratory (1995-present). Scope and Contents of CollectionThese logbooks document the group experiments of Owen Chamberlain, Emilio Segrè, and Clyde Wiegand. Their experiments related to polarized high-energy protons and lead to the discovery of the antiproton, including n-p, d-p, p-d scattering experiments, using the Bevatron accelerator at the Lawrence Berkeley Laboratory (LBL). In 1959, Owen Chamberlain and Emilio Segre won the Nobel Prize for the discovery of the antiproton. Segrè's group had constructed an elaborate detecting system in which two scintillation counters fed a circuit that timed the passage of a charged particle between them, about 50 billionths of a second for an antiproton with v-3 c/4. Any one of the 50,000 negative pions that accompanied each antiproton traversed the same distance in even less time and could easily be distinguished from the heavier particle, using the advanced coincidence circuitry designed by Clyde Wiegand. A second Cerenkov counter, designed by Wiegand and Owen Chamberlain, had a mirror system that confined its counts to particles moving at between 0.75c and 0.78c. Access to CollectionThis collection requires permission for access. Please contact the repository for more information, via email at sanbruno.archives@nara.gov. Container List
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