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it's possible that if you dont fire the central lump in fast enough the initial reaction welds ths slug without it fully penetrating, preventing the full reaction from happening.  but as I said I may be talking out of another orifice.

Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Sun Sep 23rd, 2007 at 07:47:57 AM EST
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No, that's exactly the problem with gun type bombs. It makes the design suitable only to U, not Pu which is more fissile and usually polluted with poison isotopes which amplify the "fizzle" effect.

Pierre
by Pierre on Sun Sep 23rd, 2007 at 09:57:33 AM EST
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