(a) The reaction is $\ _{3}Li^{7} +_{1}P^{1} \rightarrow 2\left( \ _{2}He^{4}) \right.\ $ $\therefore\ \ E_{p} = 2E\left( \ _{2}He^{4}) \right.\ E_{(Li)}$ $= 2(4 \times 7.06) - 7 \times 5.6$ $= 56.48 - 39.2 = 17.28\ MeV$
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