A precise determination of the energy of the neutrons from the deuteron-deuterium reaction has been made. The energy of the neutrons emitted in the forward direction to the 0.52-Mev deuterons which produced the disintegrations was found to be 3.58±{}0.03 Mev. The disintegration Q value of the reaction is 3.31±{}0.03 Mev. The mass of He³ calculated from this Q value is 3.01698±{}0.00006 mass units.
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T. W. Bonner (1941) studied this question.
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