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George Placzek

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Georg Placzek September 26, 1905 – October 9, 1955 was a Czech physicist12

Born in Brno, Moravia to Jewish parents When his son came to Canada, his last name was changed to Patton Placzek studied physics in Prague and Vienna He worked with Hans Bethe, Edward Teller, Rudolf Peierls, Werner Heisenberg, Victor Weisskopf, Enrico Fermi, Niels Bohr, Lev Landau, Edoardo Amaldi, Emilio Segrè, Leon van Hove and many other prominent physicists of his time His wife, Els Placzek née Andriesse was an ex-wife of physicist Hans von Halban

Placzek's major areas of scientific work involved a fundamental theory of Raman scattering, molecular spectroscopy in gases and liquids, neutron physics and mathematical physics Together with Otto Frisch, he suggested a direct experimental proof of nuclear fission3 Together with Niels Bohr and others, he was instrumental in clarifying the role of Uranium 235 for the possibility of nuclear chain reaction4

During his stay in Landau's circle in Kharkiv around 1937, Placzek witnessed the brutal reality of Joseph Stalin's regime His first-hand experience of this, influenced the political opinions of his close friends; Robert Oppenheimer and Edward Teller in particularcitation needed

Later, Placzek was the only Czech with a leading position in the Manhattan project, where he worked from 1943-1946 as a member of the British Mission;5 first in Canada as the leader of a theoretical division at the Montreal Laboratory and then since May 1945 in Los Alamos, later replacing his friend Hans Bethe as the leader of the theoretical group Since 1948, Placzek was a member of the Institute for Advanced Study in Princeton, USA Placzek's premature death in Zurich was very likely a suicide influenced by his long-time serious illnesscitation needed

Recently, many new facts about George Placzek and his family roots emerged in connection with a Symposium held in Placzek's memory6

Referencesedit

  1. ^ J Fischer: George Placzek - an unsung hero of physicsCern Courier, Vol 45, No 7, 2005
  2. ^ A Gottvald: Kdo byl Georg Placzek 1905-1955 Čs čas fyz, Vol 55, No 3, 2005, pp 275-287 in Czech
  3. ^ Frisch O R: "The Discovery of Fission – How It All Began" Physics Today 20 1967, 11, pp 43-48
  4. ^ Wheeler J A: "Mechanism of Fission" Physics Today 20 1967, 11, pp 49-52
  5. ^ D C Fakley: "The British Mission" Los Alamos Science, Winter/Spring 1983, pp 186-189
  6. ^ Abstracts from the Symposion in Memory of George Placzek 1905-1955, Brno Czech Republic, 2005

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    29.10.2014


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