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Terrestrial Physics : ウィキペディア英語版 | Terrestrial Physics
''Terrestrial Physics'' is a sculpture by American artist Jim Sanborn which includes a full-scale working particle accelerator.〔(【引用サイトリンク】url=http://jimsanborn.net/main.html#museuminstallations )〕 It was displayed in the Museum of Contemporary Art as part of Denver's Biennial of the Americas from June-September 2010. ==Sculpture== ''Terrestrial Physics'' involves a polished aluminum sphere that is attached to a cylindrical glass tube coupled with rings of copper. The sculpture is able to generate a 1 million volt potential difference〔 using a built-in Van de Graaff generator. The work was inspired by what followed from the unexpected report on 26 January 1939 by the physicists Niels Bohr and Enrico Fermi, invited speakers at the Fifth Washington Conference on Theoretical Physics, of the discovery of nuclear fission in Berlin by Otto Hahn and Fritz Strassmann and its interpretation by Lise Meitner and Otto Frisch.〔Dahl〕〔(【引用サイトリンク】url=https://www.youtube.com/watch?v=syWeR-8KTcI )〕 The Germans had used thermal neutrons to cause fission, but at least two U.S. groups realized they could make confirmatory experiments with accelerator neutron sources, and did so within a few days of hearing the news. The experiment at the Department of Terrestrial Magnetism (DTM) of Carnegie Institution of Washington on the night of Saturday 28 January 1939, using their Van de Graaff generator driven accelerator was probably the second U.S. confirmation of the European discovery of nuclear fission.〔 Sanborn, with permission and assistance of DTM, has reproduced the historical Van de Graaff generator used in that experiment.
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