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The rest mass of the deuteron, \( { }_{1}^{2} \mathrm{H} \), is equivalent to an energy of \( 1876 \mathrm{MeV} \), the rest mass of a proton is equivalent to \( 939 \mathrm{MeV} \) and that of a neutron to \( 940 \mathrm{MeV} \). A deuteron may disintegrate to a proton
\( P \) and a neutron if it :
(A) emits a \( \gamma \)-ray photon of energy \( 2 \mathrm{MeV} \)
(B) captures a \( \gamma \)-ray photon of energy \( 2 \mathrm{MeV} \)
W.
(C) emits a \( \gamma \)-ray photon of energy \( 3 \mathrm{MeV} \)
(D) captures a \( \gamma \)-ray photon of energy \( 3 \mathrm{MeV} \)
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