according to my understanding, again, one of the major issues of the fission-based bombs (that you describe here, instead of the thermonuclear weapons), is that

according to my understanding, again, one of the major issues of the fission-based bombs (that you describe here, instead of the thermonuclear weapons), is that one of the major issues and one of the "nuclear secrets" is thus: how do you ensure that in that collision, how to ensure that the "slamming" consumes enough of the uranium, converting it into boom, before the boom destroys the weapon itself, halting the reaction. but again, not an expert. i'd love to hear more on it if you or someone else are.