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Bohr told Leon Rosenfeld, who informed Wheeler. [16] Bohr and Wheeler set to work applying the liquid drop model to explain the mechanism of nuclear fission. [23] As the experimental physicists studied fission, they uncovered puzzling results. George Placzek asked Bohr why uranium seemed to fission with both very fast and very slow neutrons.
George Placzek asked Bohr why uranium fissioned with both very fast and very slow neutrons. Walking to a meeting with Wheeler, Bohr had an insight that the fission at low energies was due to the uranium-235 isotope, while at high energies it was mainly due to the far more abundant uranium-238 isotope. [120]
Nuclear fission is an extreme example of large-amplitude ... The 1 September 1939 paper by Bohr and Wheeler used this ... Nuclear Physics and Reactor Theory ...
Niels Henrik David Bohr (7 October 1885 – 18 November 1962) was a Danish theoretical physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research.
Bohr and John A. Wheeler set to work applying the liquid drop model developed by Bohr and Fritz Kalckar to explain the mechanism of nuclear fission. [24] George Placzek , who was skeptical about the whole idea of fission, challenged Bohr to explain why uranium seemed to fission with both very fast and very slow neutrons.
The notion of spontaneous fission had been raised by Niels Bohr and John Archibald Wheeler in their 1939 treatment of the mechanism of nuclear fission. [130] The first attempt to discover spontaneous fission in uranium was made by Willard Libby, but he failed to detect it. [131]
Frisch goes to Copenhagen to share the discovery with Niels Bohr, who in turn reports the discovery to his American colleagues. Bohr and John Archibald Wheeler determine later that year through chain-reaction experiments at Princeton University that uranium-235 could produce a nuclear explosion. [6]
In 1939, John Archibald Wheeler and Niels Bohr proposed the liquid-drop model of nuclear fission. [8] Their work suggested that uranium 235 was responsible for thermal neutron fission. This was borne out by the work of Eugene T. Booth , John R. Dunning , A. V. Grosse, and Alfred O. C. Nier , which was submitted for publication in the spring of ...