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INELASTIC NEUTRON SCATTERING IN LIQUID METHANE AND LIQUID PARAHYDROGEN

Author
Whittemore, W. L.
Published
United States : [publisher not identified], 1963.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1963.
Physical Description
microfiche : negative ; 8 x 13 cm

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Summary
The General Atomic neutron velocity selecter was used at the electron linear accelerator to study the inelastic scattering by liquid methane and liquid parahydrogen of monoengergetic neutrons with indicent energies in the range 0.009 te 0.17 ev. The energy dependence of the total cross sections and the neutron spectra produced by small specimens of these materials were also measured. The inelastic scattering of slow neutrons (<0.010 ev) at 90 deg by liquid parahydrogen appears te be smaller than expected on the basis of the measured total cross section, assuming isoropic scattering. Perhaps this is related to the fact that the total cross section is larger than for freely rotating molecules, indicating the possible existence of some hindrance to molecular motion. The logarithmic energy decrement, ln E/sub O//E, a quandtitative measure of the neutron moderating ability, is evaluated from the measured inelastic neutron-scattering data and compared for various neutron energies for the two liquids. A consideration of the various data leads to the conclusion that methane is better than liquid parahydrogen for production of very cold'' neutrons, though for production of neutrons with energies substantially greater than 0.010 ev, liquid parahydrogen is probably more effective. (auth)
Report Numbers
GA-4292; CONF-46-98
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
DOE contract number: AT(04-3)-167
NSA number: NSA-18-004512
OSTI Identifier 4127805
Research organization: General Atomic Div., General Dynamics Corp., San Diego, Calif.
View MARC record | catkey: 41841025