short communications
The wavelength dependence of the effective neutron cross section for hydrogen has been investigated by measuring the transmitted total scattering cross section in urea, β-alanine, tartaric acid and polyethylene over the energy range 3 meV to 10 eV. Under the assumption that carbon, nitrogen and oxygen atoms contribute a small and invariant amount to the measured total cross section, these data represent a direct measure of the wavelength dependence of the overall scattering contribution of the hydrogen atoms to the total cross section. These experimental data can be used to apply effective wavelength-dependent corrections to neutron scattering data of hydrogen-rich simple organic compounds.
Keywords: hydrogen cross section; neutron transmission spectroscopy; time of flight; wavelength-dependent corrections; β-alanine; urea; tartaric acid; polyethylene.
Supporting information
Portable Document Format (PDF) file https://doi.org/10.1107/S1600576719011592/in5026sup1.pdf |