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Lawrence Berkeley Laboratory Physics Division scientific logbooks of Owen Chamberlain, Emilio Segrè and Clyde Wiegand, 1946-1954

Description of Collection


National Archives and Records Administration. Pacific Sierra Region.

1000 Commodore Drive
San Bruno, CA 94066

Papers created by

Lawrence Berkeley Laboratory. Physics Division

Size of collection

1.25 linear feet
1 records box(s)

Short description of collection

These logbooks document the group experiments of Owen Chamberlain, Emilio Segrè and Clyde Wiegand.

Language(s) of collection


Collection number:

ARO-2486 (NRHS 326-02-007)

Historical Note

The 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 Collection

These 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.

Restrictions on Use and Access

This collection requires permission for access. Please contact the repository for more information, via email at

Selected Search Terms

These 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.


Chamberlain, O. (Owen)
Segrè, Emilio.
Wiegand, Clyde (Clyde Edward), 1915-1996


Lawrence Berkeley Laboratory.
Lawrence Berkeley Laboratory. Physics Division
Lawrence Berkeley National Laboratory.
Lawrence Radiation Laboratory.

Subject terms


Genre terms

Logs (records).

Administrative Information


Finding Aid to the Lawrence Berkeley Laboratory Physics Division scientific logbooks of Owen Chamberlain, Emilio Segrè and Clyde Wiegand, 1946-1954


American Institute of Physics Niels Bohr Library & Archives

One Physics Ellipse
College Park, MD 20740


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.

Series I: Scientific logbooks of Chamberlain, Segrè and Wiegand, 1946-1954

Box 1 Folder 1 High Energy Neutron Fission, July 1946-March 1948
Folder 2 BE7 Experiment Book 2, May 8, 1947-February 3,1950
Folder 3 N-P Scattering, Book I, November 1947-February 1948
Folder 4 N-P Scattering, Book II, February-June 1948
Folder 5 D-P Scattering Booi I P-P Scattering, March 1948-May 1949
Folder 6 William Goldsworth-Electronic Circuits, April 1, 1947-July 8, 1949
Folder 7 Stern-Ionization Chamber, March 28, 1949-May 8, 1950
Folder 8 N-P Scattering, Book IV, March 1949-January 1950
Folder 9 P-Absorption, July-December 1950
Folder 10 D-P Scattering I Bloom and Stern, March-December 1950
Folder 11 D-P Scattering II Bloom and Stern, January-July 1951
Folder 12 P-D Book I (Clark), September 1951-February 1953
Folder 13 David D. Clark-Supplementary Notes to P-D Elastic Scattering Experiment, December 1952-August 1953
Folder 14 D-P III Bloom and Stern, July 1951-August 1953
Folder 15 Richard Morris, July 14, 1953-December 11, 1953
Folder 16 P-D Book II (Clark), March-September 1953
[Untitled Log Book], June-October 1954
Folder 17 P-P IX Chamberlain, Powell, Segrè, Wiegand, June 1954
Folder 18 P-P V, March 1953-May 1954
Folder 20 G.H.P. I - Liguiard Scintillator Light-Pipe and 5819 Test Setup, March 1953-September 1954