A measurement of the Flight Path 12 cold H2 moderator brightness at LANSCE

P. N. Seo, J. D. Bowman, M. Gericke, G. Greene, J. Long, G. S. Mitchell, S. I. Penttila, W. S. Wilburn

Research output: Contribution to journalArticlepeer-review


We have measured the brightness of the Flight Path 12 upstream/back-scattering partially coupled cold hydrogen moderator at LANSCE. This measurement was performed in the neutron energy range of 0.8-76.9meV by using a time-of-flight technique in conjunction with a two-pinhole collimator system. Cold neutrons were observed with a redundant 6Li-loaded glass scintillation detector having an efficiency of close to unity. The detector viewed an area of 0.93cm2 on the center of the 12×12cm2 moderator surface. A maximum brightness of 1.25×108neutronss-1sr-1cm -2meV-1μA-1 was measured at 3.3-meV neutron energy. Statistical and systematic errors of the measurement are 3% and 7%, respectively. The measured brightness is compared to the result of a model calculation and there is a significant disagreement, by a factor of 1.5 at the peak. The performance of the m=3 supermirror neutron guide system on Flight Path 12 was also studied with the two pinhole-detector system. Published by Elsevier B.V.

Original languageEnglish (US)
Pages (from-to)285-294
Number of pages10
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-3
StatePublished - Jan 21 2004
Externally publishedYes


  • Li glass scintillation detector
  • Brightness
  • Cold neutron
  • Moderator
  • Time-of-flight
  • Two-pinhole system

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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