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High energy neutron scattering from hydrogen using a direct geometry spectrometer
- Source :
- Phys. Rev. B 81, 024303 (2010)
- Publication Year :
- 2009
-
Abstract
- 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 direct geometry chopper instruments at high incident energies and demonstrate their capability for conducting high-energy spectroscopy.<br />Comment: 16 pages, 19 figures, submitted to Physical Review B, new discussion on resolution
- Subjects :
- Condensed Matter - Statistical Mechanics
Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 81, 024303 (2010)
- Publication Type :
- Report
- Accession number :
- edsarx.0907.1945
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.81.024303