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The angular distribution of d-d neutrons scattered by hydrogen, deuterium and helium was measured by observing the distribution in energy of the recoil particles in an ionization chamber. The scattering in hydrogen and deuterium was found to be essentially isotropic in the angular interval investigated. In helium, collisions with small energy transfer were more frequent than large angle scattering. The absolute differential scattering cross section of helium was measured.
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Barschall et al. (1940) studied this question.
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