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2021-01-07 10:36:06
BOHR, Niels & WHEELER, John A.
BOHR. Resonance in Uranium and Thorium Disintegration and the Phenomenon of Nuclear Fission, pp. 418-20 in Physical Review: Vol. 55, No. 4, February 15, 1939; [With:] [BOHR & WHEELER] Mechanism of Nuclear Fission, pp. 426-50 in Physical Review Vol. 56, No. 5, September 1, 1939; [With:] [BOHR & WHEELER] Fission of Protactinium, pp. 1065-6 in Physical Review Vol. 56, No. 10, November 15, 1939. NUCLEAR FISSION
Lancaster, PA & New York, NY: American Physical Society, 1939. First editions, journal issues in original printed wrappers, of Bohr and Wheeler's important theoretical papers on nuclear fission, which were essential to the development of the atomic bomb, as well as to the peaceful uses of atomic energy. In January 1939 Lise Meitner and Otto Frisch, with Bohr's encouragement, had published a letter in Nature announcing their discovery of nuclear fission in uranium. The news took the scientific world by storm, with over 100 papers on uranium fission experiments appearing in the next twelve months. "All this was experimental. The only theoretical contributions in that period were made by Bohr and by Bohr and Wheeler (Pais, Niels Bohr's Times, p. 456). The first paper includes 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" (American Institute of Physics website). The second paper is the first detailed theoretical account of fission: "Though it would be refined further, the theory of Bohr and Wheel … [Click Below for Full Description]
Bookseller: Landmarks of Science Books [Richmond, United Kingdom]
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