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Unformatted text preview: 6-10 Binary Nuclear Reactions Chap.6 In a particular neutron-induced fissionof 235U,4 prompt neutrons are produced and one fission fragment is 121 g. ( a) What is the other fission fragment? (b) A How much energy is liberated promptly (i.e., beforethe fission fragments begin to decay)? (c) If the total initial kinetic energy of the fission fragments is 150 MeV, what is the initial kinetic energy of each? (d) What is the total kinetic energy shared by the four prompt neutrons. Solution:
(a) The fission fragments are
235U 92 ln A + 0 --+ 4( 0 ) + 121 g + 111Rh 1n 47 45. (b) The prompt energy emissionis the Q-value for the above reaction, namely Q = [2~~U mn -4mn -l~~Ag -1~~Rh]C2 = 113.6 MeV. + (c) From Eq. (6.41) for a total fissionfragment kinetic energyof Eff = 150 MeV 14. Consider the following fission reaction ~n + 2~~U--+ ~gKr + l~~Ba+ 4(~n) + 67 where 90Kr and 142Baare the initial fission fragments. (a) What is the fission product chain created by each of these fission fragments? (b) What is the equivalent fission reaction taken to the stable end fission products? (c) How much energy is liberated promptly? (d) What is the total energy eventually emitted? Solution: (a) From the Chart of the Nuclides we find July 24, 2002 13. ...
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- Spring '06