Measurement of the delayed neutron fraction and correction of small angle scattering data from a pulsed spallation source

J. E. Epperson, J. M. Carpenter, P. Thiyagarajan, B. Heuser

Research output: Contribution to journalArticlepeer-review

Abstract

The fraction of delayed neutrons in a moderated beam from the enriched uranium, pulsed spallation source at the intense pulsed neutron source at Argonne National Laboratory has been measured and found to be 0.0283 for 450-MeV protons. Delayed neutrons produce a sample-dependent background in time-of-flight instruments. Because of the distribution of neutron wavelengths in the prompt pulse, the significance of the delayed neutron contribution to the observed scattering profile is strongly dependent on the wavelength and therefore on the magnitude of the momentum transfer. This effect is demonstrated, and a general correction procedure in current use for small angle neutron scattering data is described.

Original languageEnglish (US)
Pages (from-to)30-34
Number of pages5
JournalNuclear Inst. and Methods in Physics Research, A
Volume289
Issue number1-2
DOIs
StatePublished - Apr 1 1990
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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