I have heard it said that even if Fuchs had not provided details which must have been invaluable — just knowing, for example, that implosion and explosive lenses were employed without any further details would have been huge — the Soviets would have had a huge advantage over allied scientists.

This would have come from the fact that they, after Hiroshima, knew that such a device could be constructed.

That certainly rings true to me — the top soviet physicists would not have had to wonder if the whole idea was crazy and that would have saved a tremendous amount of physic energy. I am looking for a quote where one of the theoreticians actually credits this as having helped them.

  • 2
    $\begingroup$ Implosion and lenses were only needed for plutonium. Uranium works just fine in a gun arrangement (which was not even tested before fielding). $\endgroup$
    – Jon Custer
    Jun 18 at 13:09
  • 1
    $\begingroup$ Fuchs was not the only one. $\endgroup$
    – markvs
    Jun 20 at 0:50
  • $\begingroup$ no, but he was most important one. $\endgroup$
    – releseabe
    Jun 20 at 1:04
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    $\begingroup$ @releseabe: That is very unclear. I think we do not know who was the most important one. Bohr? Oppenheimer? They certainly knew more than Fuchs. $\endgroup$
    – markvs
    Jun 20 at 4:03
  • 2
    $\begingroup$ that oppenheimer was or could have been a spy is news to me. $\endgroup$
    – releseabe
    Jun 20 at 9:11

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