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It seems you are saying that if you have a critical mass, then just because of this a warhead will go detonate.
That's right. Here, have a citation:
As part of a re-creation of a 1945 criticality accident, a 'pit' of plutonium is surrounded by blocks of neutron-reflective tungsten carbide. The original experiment was designed to measure the radiation produced when an extra block was added. Instead, the mass went supercritical.
http://en.wikipedia.org/wiki/Critical_mass
Notice that your claim that "A great amount of heat and pressure must be applied to trigger an nuclear denotation" doesn't even enter into it. Because you don't know what you're talking about.
Naturally, that can't be true, because they are not going off right now.
Once again, you don't know what you're talking about.
A warhead contains subcritical masses which are combined to create a critical mass which causes the detonation.
If a warhead didn't contain enough material to create a critical mass it wouldn't detonate and you wouldn't have a bomb.
Say "d'oh!" for us, neocon.