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High Energy Neutron Scattering from Hydrogen Using a Direct Geometry Spectrometer by Stock, C.; Cowley, R. A.; Taylor, J. W.; Bennington, S. M. is a scholarly article available to read on EtoBox.

What is High Energy Neutron Scattering from Hydrogen Using a Direct Geometry Spectrometer about?

Deep inelastic neutron scattering experiments using indirect time-of-flight spectrometers have reported a smaller cross section for the hydrogen atom than expected from conventional scattering theory. Typically, at large momentum transfers, a deficit of 20-40% in the neutron scattering intensity has been measured and several theories have been developed to explain these results. We present a different approach to this problem by investigating the hydrogen cross section in polyethylene using the direct geometry time-of-flight spectrometer MARI with the incident energy fixed at a series of values ranging from Ei=0.5 eV to 100 eV. These measurements span a much broader range in momentum than previous studies and with varying energy resolutions. We observe no momentum dependence to the cross section with an error of 4% and through a comparison with the scattering from metal foil standards measure the absolute bound cross section of the hydrogen atom to be sigma(H)= 80 +/- 4 barns. These results are in agreement with conventional scattering theory but contrast with theories invoking quantum entanglement and neutron experiments supporting them. Our results also illustrate a unique use of

Author

Stock, C.; Cowley, R. A.; Taylor, J. W.; Bennington, S. M.

Published

2009

Language

EN