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2021-01-13 22:40:03
BOHR, Niels
Resonance in uranium and thorium disintegration and the phenomenon of nuclear fission, pp. 418-9 in Physical Review, Vol. 55, No. 4, 15 February 1939.
Lancastr, PA & New York, NY: American Physical Society, 1939. First edition, complete journal issue in original printed wrappers, of arguably Bohr’s most important paper on nuclear fission, the first recognition of the crucial importance played by uranium-235, the only isotope found in nature capable of sustaining a chain reaction and the fissile material used in the first atomic bombs. “In the first week of [February 1939], in response to early experimental data from [the Carnegie Institute of Washington] showing uranium fission by ‘slow’ neutrons, Bohr suggest[ed that] the very rare uranium-235 (U235) isotope, which would fission under all circumstances, is solely responsible for slow-neutron fission, while the abundant uranium-238 (U238) isotope requires ‘fast’ neutrons of over 1 MeV in energy in order to fission. Because U238 generally scatters incident neutrons, most neutrons will lose energy until they have an energy matching the ‘absorption resonance’ energy of U238, at which point they will be absorbed and removed from the reaction. However, slow neutrons already below the absorption resonance will continue to scatter until they fission a U235 nucleus” (APS website). Large 8vo, pp. 323-424. Original printed wrappers [Attributes: First Edition; Soft Cover]
Bookseller: Landmarks of Science Books [Richmond, United Kingdom]
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