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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/10938077
Record Status
Checked
Record Id
10938077
Title
Mass-selective neutron spectroscopy of lithium hydride and deuteride: Experimental assessment of the harmonic and impulse approximations
Contributors
M Krzystyniak (STFC Rutherford Appleton Lab.)
,
SE Richards
,
AG Seel (STFC Rutherford Appleton Lab.)
,
F Fernandez-Alonso (STFC Rutherford Appleton Lab.)
Abstract
Neutron Compton scattering experiments on crystalline lithium hydride and deuteride are presented and compared with existing experimental data and first-principles predictions. With currently available instrumentation, these measurements demonstrate sufficient mass selectivity for studies of nuclear-momentum distributions of protons, deuterons, and lithium using forward and backscattering geometries. In both materials, spectral discrimination of lithium-recoil features is highest in backscattering geometry, although mass isolation is also possible in the forward-scattering direction. These results evince the possibility of performing simultaneous mass-selective neutron spectroscopic studies for nuclei with m$>$4~amu. We also provide an in-depth analysis and assessment of departures from the harmonic and impulse approximations as described by the celebrated Sears expansion of the dynamic structure factor, as well as how these can manifest themselves in the experimental data. We close by outlining the potential of our experimental strategy for mass-selective spectroscopic studies of materials containing protons and other light nuclides.
Organisation
ISIS
,
ISIS-VESUVIO
,
STFC
Keywords
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Language
English (EN)
Type
Details
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Year
Journal Article
Phys Rev B
88, no. 18 (2013): 184304.
doi:10.1103/PhysRevB.88.184304
2013
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