Abstract
This paper is an account of an experiment designed to determine the binding energy of the deuteron by a method which is relatively insensitive to uncertainties in the energy-range relation for protons of low energy. The protons, produced by the disintegration of Th C\ensuremath{''} $\ensuremath{\gamma}$-radiation, were observed in a low pressure cloud chamber in a strong magnetic field. The curvatures of the tracks allowed the calculation of the corresponding kinetic energies. The final value of the binding energy as given by this experiment is ${\overline{V}}_{B}=(2.17\ifmmode\pm\else\textpm\fi{}0.05)\ifmmode\times\else\texttimes\fi{}{10}^{6} \mathrm{electron}\mathrm{volts},$ which is in reasonable agreement with previous determinations by others. The uncertainty 0.05 Mev is the maximum uncertainty to be expected in this value of the binding energy.
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