When the nuclear reaction represented by Equation 43.29 is endothermic, the reaction energy Q is negative. For the reaction to proceed, the incoming particle must have a minimum energy called the threshold energy, E. Some fraction of the energy of the incident particle is transferred to the compound nucleus to conserve momentum. There- fore, E, must be greater than Q (a) Show that E.--e(1+) M -Q[1+ Mx a (b) Calculate the threshold energy of the incident alpha particle in the reaction He + 4N 70 + }H a + X → Y + b (43.29)
When the nuclear reaction represented by Equation 43.29 is endothermic, the reaction energy Q is negative. For the reaction to proceed, the incoming particle must have a minimum energy called the threshold energy, E. Some fraction of the energy of the incident particle is transferred to the compound nucleus to conserve momentum. There- fore, E, must be greater than Q (a) Show that E.--e(1+) M -Q[1+ Mx a (b) Calculate the threshold energy of the incident alpha particle in the reaction He + 4N 70 + }H a + X → Y + b (43.29)
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