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Originally Posted by BBKing
* assuming it's the one about the need for rate of neutron escape to be small compared with the rate of neutron creation for critical mass - Heisenberg calculated something like 40 tons of U235 for a bomb, which was ludicrous.
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From what I remember Heisenber calculated that Germany need a sphere of refined U235 about 4 feet in diameter, where as the Americans calculated to to be 6 inchs or so in diameter. How much this comes to in mass I have no idea.
All in all it made for interesting reading, even though I stoped studying Physics at GCSE level 16 years ago.
