John R. Dunning

John R. Dunning (1907-1975) was an American physicist. 

In 1939, Dunning led the American research team verifying fission of the uranium atom. During the Manhattan Project, Dunning led the day-to-day operations and research at the Substitute Alloy Materials Lab (SAM) at Columbia.  He conducted work on gaseous diffusion to separate uranium isotopes.  This method was used by the Manhattan Project to separate U-235 from U-238 in the manufacture of the atomic bomb.

After the war, Dunning became a full professor of physics at Columbia in 1946 and directed its engineering faculty.

John R. Dunning's Timeline

  • 1935 to 1936 Traveled Europe meeting with prominent nuclear physicists.
  • 1939 Led the American research team verifying fission of the uranium atom.
  • 1940 Mar 2nd Made the first direct measurements of the enormous slow fission cross section of uranium-235.

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