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New upper bound on the scattering cross section of slow neutrons on liquid parahydrogen from neutron transmission | | K. B. Grammer
; R. Alarcon
; L. Barrón-Palos
; D. Blyth
; J. D. Bowman
; J. Calarco
; C. Crawford
; K. Craycraft
; D. Evans
; N. Fomin
; J. Fry
; M. Gericke
; R. C. Gillis
; G. L. Greene
; J. Hamblen
; C. Hayes
; S. Kucuker
; R. Mahurin
; M. Maldonado-Velázquez
; E. Martin
; M. McCrea
; P. E. Mueller
; M. Musgrave
; H. Nann
; S. I. Penttilä
; W. M. Snow
; Z. Tang
; W. S. Wilburn
; | | Date: |
8 Oct 2014 | | Abstract: | The scattering of slow neutron beams provides unique, non-destructive,
quantitative information on the structure and dynamics of materials of interest
in physics, chemistry, materials science, biology, geology, and other fields.
Liquid hydrogen is a widely-used neutron moderator medium, and an accurate
knowledge of its slow neutron cross section is essential for the design and
optimization of intense slow neutron sources. In particular the rapid drop of
the slow neutron scattering cross section of liquid parahydrogen below 15 meV,
which renders the moderator volume transparent to the neutron energies of most
interest for scattering studies, is therefore especially interesting and
important. We have placed an upper bound on the total cross section and the
scattering cross section for slow neutrons with energies between 0.43 meV and
16.1 meV on liquid hydrogen at 15.6 K using neutron transmission measurements
on the hydrogen target of the NPDGamma collaboration at the Spallation Neutron
Source at Oak Ridge National Laboratory. At 1 meV this new upper bound is a
factor of 3 below the data from previous work which has been used in the design
of liquid hydrogen moderators at slow neutron sources. We describe our
measurements, compare them with previous work, and discuss the implications for
designing more intense slow neutron sources. | | Source: | arXiv, 1410.2177 | | Services: | Forum | Review | PDF | Favorites | |
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