The English physicist James Chadwick, b. Oct. 20, 1891, d. July 24, 1974, is known for his discovery of the neutron. He graduated from the University of Manchester (1911), and during the 1920s he worked with Ernest Rutherford in the new field of nuclear physics. His experiments on the bombardment of certain light elements with alpha particles led to the discovery of the neutron (1932), for which he was awarded the 1935 Nobel Prize for physics. During World War II, Chadwick worked on the atomic bomb. He was knighted in 1945.
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