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In writing down the reaction equation, in a way analogous to a chemical equation, one may in addition give the reaction energy on the right side:
For the particular case discussed above, the reaction energy has already been calculated as Q = 22.4 MeV. Hence:
The reaction energy (the "Q-value") is positive for exothermal reactions and negative for endothermal reactions. On the one hand, it is the difference between the sums of kinetic energies on the final side and on the initial side. But on the other hand, it is also the difference between the nuclear rest masses on the initial side and on the final side (in this way, we have calculated the Q-value above).
Q value is just the reaction energy of any reaction.
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