Manhattan Project, Segrès Group

Segrès Group from left to right: Emilio Segrès, Owen Chamberlain, Gustave Linenberger, Ann Kahn, John Miskel, Milton Kahn, John Jungerman, Martin Deutsch, Unknown, Clyde Wiegand, George Farwell, Ralph Nobles, Unknown, Unknown. Emilio Gino Segrè (February 1, 1905 - April 22, 1989) was an Italian-born, naturalized American, physicist and Nobel laureate in physics, who with Owen Chamberlain, discovered antiprotons, a sub-atomic antiparticle. Working with his graduate students and two University of California chemists, Arthur Wahl and Joseph Kennedy, Segrè measured rates of spontaneous fission in natural uranium and plutonium in 1942 and 1943. The plutonium was made by the 60-inch Crocker medical cyclotron at the UC Radiation Laboratory by the bombardment of uranium-238 by deuterons, the ions of heavy-water (deuterium). To investigate the possibility of spontaneous fission in plutonium, Los Alamos Director J. Robert Oppenheimer invited Segrè and his group to move to Los Alamos to continue their experiments.

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