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Person

Otto Hahn

A man wearing glasses and a dark suit with a white shirt and tie stands against a dark background, looking directly at the camera.

German radiochemist, 1879–1968. In December 1938, working at the Kaiser Wilhelm Institute in Berlin with his assistant Fritz Strassmann, he found that uranium bombarded with neutrons produced barium — an element about half uranium's weight. He could not interpret the result chemically and wrote it up to his exiled colleague Lise Meitner. He received the 1944 Nobel Prize in Chemistry for the discovery, alone.

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