PROF. PETER FOWLER / SCIENCE PHOTO LIBRARY PROF. PETER FOWLER / SCIENCE PHOTO LIBRARY
Atomic and nuclear physicists. Seated from left are: Sir James Chadwick, the discoverer of the neutron (1932), Hans Geiger, who invented a counter for charged nuclear particles, and (at centre) Sir Ernest Rutherford, considered the father of nuclear physics. Standing from left are: Gyorgy Hevesy, who introduced the use of radioactive tracers to biological systems, Mrs Geiger, Lise Meitner and Otto Hahn. The last two obtained the first nuclear fission (1939).
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