The angular variation of the scattering of neutrons of 0.0724 ev. energy by deuterium gas has been measured. Comparison with theoretical calculations of this variation gives a ratio of scattering lengths:In combination with the known total scattering cross section of the free deuteron of 3.44 ± 0.06 barns this gives for the scattering lengths the two sets of values:
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Hurst et al. (1950) studied this question.
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