copperstream Posted February 25, 2008 Share Posted February 25, 2008 We all know that uranium undergoes fission to produce barium , krypton , and three neutrons.If these products are fused ,...Will they form the original Uranium molecule?? If so, a neutron can bombard with the new uranium to undergo controlled chain reaction.is it possible??????. Please help me. Link to comment Share on other sites More sharing options...
YT2095 Posted February 25, 2008 Share Posted February 25, 2008 throw some Thorium into the equation and do it again : Link to comment Share on other sites More sharing options...
swansont Posted February 25, 2008 Share Posted February 25, 2008 n + U —> Kr + Ba + 3n is only an example; many products are formed from fission. Yes, you could put them back together, in principle, but it would take as much energy as you got from the original fission (at a minimum). Link to comment Share on other sites More sharing options...
ydoaPs Posted February 26, 2008 Share Posted February 26, 2008 throw some Thorium into the equation and do it again : There are far more fission fragments than that. edit: Here is what seems to be a decent intro to nuclear physics. Link to comment Share on other sites More sharing options...
Realitycheck Posted February 26, 2008 Share Posted February 26, 2008 Doesn't it take an infinitely huge amount of energy to fuse heavier elements? Link to comment Share on other sites More sharing options...
ydoaPs Posted February 26, 2008 Share Posted February 26, 2008 Doesn't it take an infinitely huge amount of energy to fuse heavier elements? No, just a lot. Link to comment Share on other sites More sharing options...
swansont Posted February 26, 2008 Share Posted February 26, 2008 Doesn't it take an infinitely huge amount of energy to fuse heavier elements? The net energy to fuse would be on order of 200 MeV per reaction, since that's about how much energy is released in fission. The activation energy due to the coulomb barrier is very high, though, so you need that as well, but that energy would be present after the reaction. Link to comment Share on other sites More sharing options...
YT2095 Posted February 26, 2008 Share Posted February 26, 2008 There are far more fission fragments than that. edit: Here is what seems to be a decent intro to nuclear physics. that wasn`t my point at all, look up Breeder Reactors! Link to comment Share on other sites More sharing options...
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