Under bombardment by ThC{'} alpha-particles neon and calcium have been found to emit protons while argon does not. The maximum energies of the protons have been measured: the nuclear energy changes are for the neon reaction -2.6₄ Mev and for calcium -4.2₃ Mev. In each case only one group was found. Using Aston's recent value for the mass of Ne²⁰ we deduce that the mass of Na²³ is 22.9972. Data from a number of transmutations are used together with mass spectrographic values to give a table of isotopic masses from Ne²⁰ to A⁴⁰ with four exceptions.
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Pollard et al. (1937) studied this question.
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