During February 1940, physicists Otto Frisch and Rudolf Peierls, living in the UK prepared a analysis of the possibility of fast fission in U-235. Their report contains the first well grounded estimates of the size of a critical mass and probable efficiency, and proposed practical schemes for bomb design and the production of U-235. This "roadmap" for fission weapon development would be elaborated upon and modified to a spectacular degree in the coming years, but it remains basically sound.
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