Proceedings of the Japan Academy, Series B
Online ISSN : 1349-2896
Print ISSN : 0386-2208
Reviews
The discoveries of uranium 237 and symmetric fission — From the archival papers of Nishina and Kimura
Nagao IKEDA
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2011 Volume 87 Issue 7 Pages 371-376

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Abstract

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 231Th, a member of the natural actinium series of nuclides, by bombarding thorium with fast neutrons. This resulted in the discovery of 237U, a new isotope of uranium, by bombarding uranium with fast neutrons, and confirmed that 237U 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.

(Communicated by Toshimitsu YAMAZAKI, M.J.A.)

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© 2011 The Japan Academy
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