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8777882 
Journal Article 
Review 
The discoveries of uranium 237 and symmetric fission-From the archival papers of Nishina and Kimura 
Ikeda, N 
2011 
1 
Proceedings of the Japan Academy, Series B Physical and Biological Sciences
ISSN: 0386-2208
EISSN: 1349-2896 
87 
7 
371-376 
English 
21785255 
WOS:000294036500001 
Shortly before the Second World War time, Nishina, reported on a series of prominent nuclear physical and radiochemical studies in collaboration with Kimura. They artificially produced Th-231, a member of the natural actinium series of nuclides, by bombarding thorium with fast neutrons. This resulted in the discovery of U-237, a new isotope of uranium, by bombarding uranium with fast neutrons, and confirmed that U-237 disintegrates into element 93 with a mass number of 237. They also identified the isotopes of several middle-weighted elements produced by the symmetric fission of uranium. In this review article, the highlights of their work are briefly summarized along with some explanatory commentaries. 
thorium; uranium; fast neutron; uranium 237; neptunium; symmetric fission; FAST-NEUTRONS; PRODUCTS; THORIUM 
IRIS
• Uranium Toxicological Review
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