Abstract
CHADWICK and Goldhaber1 in their experiments on the splitting of deuterium by -rays from thorium (hv = 2.62 × 103 ev.) measured, by means of an amplifier and a recording oscillograph, the ionisation of each photo-proton produced. They found the average size of this ionisation to be 7,200 ion-pairs, which, assuming 33 ev. as the ionisation energy of deuterium and adopting for the masses of hydrogen and deuterium 1.0031 and 2.0142 respectively, leads to the value 1.0034 for the mass of the neutron.
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Proc. Roy. Soc., A, 151, 479 (1935).
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ISING, G., HELDE, M. Nuclear Photo-electric Effect in Deuterium. Nature 137, 273 (1936). https://doi.org/10.1038/137273a0
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DOI: https://doi.org/10.1038/137273a0
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