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Question
Two fusion reactions mentioned in the text are

$n + {}^3\textrm{He} \rightarrow {}^4\textrm{He} + \gamma$

and

$n + {}^1\textrm{H} \rightarrow {}^2\textrm{H} + \gamma$

Both reactions release energy, but the second also creates more fuel. Confirm that the energies produced in the reactions are 20.58 and 2.22 MeV, respectively. Comment on which product nuclide is most tightly bound, ${}^4\textrm{He}$ or ${}^2\textrm{H}$
1. $20.58\textrm{ MeV}$ and $2.22\textrm{ MeV}$
2. ${}^4\textrm{He}$ is more tightly bound than ${}^2\textrm{H}$ since it has an even number of neutrons. The greater energy released to form ${}^4\textrm{He}$ also indicates greater binding energy per nucleon and thus greater stability.
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