Abstract
In some measurements on the VVR-M reactor of the Ukr.SSR Academy of Sciences Physics Institute the total cross sections of liquid nitrogen and oxygen have been determined and also the total cross section of gaseous nitrogen for neutrons with wavelengths in the range 4–5 Å. The cross sections for gaseous oxygen and nitrogen increase monotonically with increasing wavelength whereas, for the liquids, the cross sections start to decrease for wavelengths beyond A ≈ 5–5·5 Å. This effect is evidently connected with the existence of short-range order in liquids, and is similar in nature to the scattering of neutrons in polycrystalline substances at wavelengths close to Å = 2 d max. The question of the existence of coherent effects in the total cross section of heavy water is examined.
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