The mass defect is the difference between the mass of the reactants and the products in a nuclear reaction. In this case, the reactants are ${ }_{1}^{2} \mathrm{H}$ and ${ }_{1}^{3} \mathrm{H}$ and the products are ${ }_{2}^{4} \mathrm{He}$ and ${ }_{0}^{1}
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