Neutrons with an energy of 14.1 Mev have been scattered in oxygen gas, and the recoil oxygen nuclei observed in a cloud chamber operated at a pressure of 1/5 atmosphere. Recoils from elastically scattered neutrons were resolved from recoils due to inelastic scattering. The results indicate a strong asymmetry in the angular distribution of elastically scattered neutrons; the angular distribution has maxima at 0^∘{}, 80^∘{}, and 180^∘{} and minima at 60^∘{} and 130^∘{}. Within a factor of 2, the angular distribution for the inelastically scattered neutrons is symmetrical. The probability per unit energy interval that the oxygen nucleus will be left excited is about 5 times as large at 6-Mev excitation as at 12-Mev.The cross section of oxygen for 14.1-Mev neutrons is 0.7×{}10^-24 cm² for elastic scattering, 0.5×{}10^-24 cm² for inelastic scattering, and 0.4×{}10^-24 cm² for disintegration.
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J. P. Conner (1953) studied this question.
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