The Manhattan Project

In partnership with the National Museum of Nuclear Science & HistoryNational Museum of Nuclear Science & History

Robert Bacher

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In 1943, J. Robert Oppenheimer recruited American physicist Robert Bacher to join the Manhattan Project as head of the experimental physics division at Los Alamos. Bacher directed the bomb physics division at Los Alamos from 1944 to 1945, helping oversee the design of the implosion bomb, known as “Fat Man,” that was dropped on Nagasaki. In this interview, Bacher recalls the initial conference of Los Alamos laboratory leadership in 1943 and describes Oppenheimer’s relationships with Enrico Fermi and General Leslie Groves. He recounts how Oppenheimer improved as a lecturer, and remembers the excitement caused in the physics community by the development of quantum mechanics and the discovery of the neutron.