The Making Of A Soviet Scientist: My Adventures In Nuclear Fusion And Space From Stalin To Star Wars

The Making Of A Soviet Scientist: My Adventures In Nuclear Fusion And Space From Stalin To Star Wars

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Andrei Sakharov's study group at FIAN in 1948 came up with a second concept in which adding a shell of natural, unenriched uranium around the deuterium would increase the deuterium concentration at the uranium-deuterium boundary and the overall yield of the device, because the natural uranium would capture neutrons and itself fission as part of the thermonuclear reaction. This idea of a layered fission-fusion-fission bomb led Sakharov to call it the sloika, or layered cake.[40] It was also known as the RDS-6S, or Second Idea Bomb.[41] This second bomb idea was not a fully evolved thermonuclear bomb in the contemporary sense, but a crucial step between pure fission bombs and the thermonuclear "supers".[42] Due to the three-year lag in making the key breakthrough of radiation compression from the United States the Soviet Union's development efforts followed a different course of action. In the United States they decided to skip the single-stage fusion bomb and make a two-stage fusion bomb as their main effort.[40][43] Unlike the Soviet Union, the analog RDS-7 advanced fission bomb was not further developed, and instead, the single-stage 400-kiloton RDS-6S was the Soviet's bomb of choice.[40] 2b1af7f3a8