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Broad spectrum moderators and advanced reflector filters using (208)pb

Schonfeldt, T.; Batkov, Konstantin LU ; Klinkby, E. B.; Lauritzen, B.; Mezei, Ferenc LU ; Muhrer, G.; Pitcher, Eric LU ; Takibayev, Alan LU ; Willendrup, P. K. and Zanini, Luca LU (2015) In Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment 769. p.1-4
Abstract
Cold and thermal neutrons used in neutrons scattering experiments are produced in nuclear reactors and spallation sources. The neutrons are cooled to thermal or cold temperatures in thermal and cold moderators, respectively. The present study shows that it is possible to exploit the poor thermalizing property of Pb-208 to design a broad spectrum moderator, i.e. a moderator which emits thermal and cold neutrons from the same position. Using Pb-208 as a reflector filter material is shown to be slightly less efficient than a conventional beryllium reflector filter. However, when surrounding the reflector filter by a cold moderator it is possible to regain the neutrons with wavelengths below the Bragg edge, which are suppressed in the... (More)
Cold and thermal neutrons used in neutrons scattering experiments are produced in nuclear reactors and spallation sources. The neutrons are cooled to thermal or cold temperatures in thermal and cold moderators, respectively. The present study shows that it is possible to exploit the poor thermalizing property of Pb-208 to design a broad spectrum moderator, i.e. a moderator which emits thermal and cold neutrons from the same position. Using Pb-208 as a reflector filter material is shown to be slightly less efficient than a conventional beryllium reflector filter. However, when surrounding the reflector filter by a cold moderator it is possible to regain the neutrons with wavelengths below the Bragg edge, which are suppressed in the beryllium reflector filter. In both the beryllium and lead case surrounding the reflector filter with a cold moderator increases the cold brightness significantly compared to a conventional reflector filter. (C) 2014 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Spallation, Neutron, Moderators, Reflector filter, Rispectral, Neutronics
in
Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
volume
769
pages
1 - 4
publisher
Elsevier
external identifiers
  • wos:000344997000001
  • scopus:84908263466
ISSN
0167-5087
DOI
10.1016/j.nima.2014.09.048
language
English
LU publication?
yes
id
fa9e1d9e-219e-420e-b8d0-7c09c3d35a3f (old id 4982746)
date added to LUP
2015-01-27 11:26:38
date last changed
2017-07-09 04:06:57
@article{fa9e1d9e-219e-420e-b8d0-7c09c3d35a3f,
  abstract     = {Cold and thermal neutrons used in neutrons scattering experiments are produced in nuclear reactors and spallation sources. The neutrons are cooled to thermal or cold temperatures in thermal and cold moderators, respectively. The present study shows that it is possible to exploit the poor thermalizing property of Pb-208 to design a broad spectrum moderator, i.e. a moderator which emits thermal and cold neutrons from the same position. Using Pb-208 as a reflector filter material is shown to be slightly less efficient than a conventional beryllium reflector filter. However, when surrounding the reflector filter by a cold moderator it is possible to regain the neutrons with wavelengths below the Bragg edge, which are suppressed in the beryllium reflector filter. In both the beryllium and lead case surrounding the reflector filter with a cold moderator increases the cold brightness significantly compared to a conventional reflector filter. (C) 2014 Elsevier B.V. All rights reserved.},
  author       = {Schonfeldt, T. and Batkov, Konstantin and Klinkby, E. B. and Lauritzen, B. and Mezei, Ferenc and Muhrer, G. and Pitcher, Eric and Takibayev, Alan and Willendrup, P. K. and Zanini, Luca},
  issn         = {0167-5087},
  keyword      = {Spallation,Neutron,Moderators,Reflector filter,Rispectral,Neutronics},
  language     = {eng},
  pages        = {1--4},
  publisher    = {Elsevier},
  series       = {Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment},
  title        = {Broad spectrum moderators and advanced reflector filters using (208)pb},
  url          = {http://dx.doi.org/10.1016/j.nima.2014.09.048},
  volume       = {769},
  year         = {2015},
}