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This can be calculated by reference to a table of very accurate particle rest masses, as follows: according to the reference tables, the nucleus has a standard atomic weight of 6.015 daltons (symbol Da), the deuterium has 2.014 Da, and the helium-4 nucleus has 4.0026 Da. Thus:
* the sum of the rest mass of the individual nuclei = 6.015 Da + 2.014 Da = 8.029 Da;
* the total rest mass on the two helium-nuclei = 2 × 4.0026 Da

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