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EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Mossbauer and Hofstadter, Nobel laureates. German physicist Rudolf Ludwig Mossbauer (1929-2011) and US physicist Robert Hofstadter (1915-1990) in December 1961, at the Nobel Prize ceremony in Stockholm, Sweden, where they shared the 1961 Nobel Prize in Physics. Mossbauer discovered his 'Mossbauer effect' in 1957, a phenomenon where gamma rays are produced by nuclear transitions. Hofstadter studied nuclear structure and nuclear charge density, and found that neutrons and protons have size and shape. He concluded that they were made of charged shells but that the charges cancelled out in the neutron.
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