A strong dynamic neutron source based on the 209Bi(γ, n) reaction

R. Moreh, R. Fedorowicz, W. V. Prestwich, T. J. Kennett, M. A. Islam

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


An intense dynamic n-source, I = 105 n/s having two n-groups En = 177 keV and 114 keV is reported. It is based on the Bi(γ, n) reaction where a chance overlap occurs between a γ-line of the Cu(n, γ) reaction and a nuclear level at 7637 keV in 209Bi. The thermal neutrons which induces the Cu(n, γ) reaction are obtained from a reactor. The spin, parity and total and radiative widths of the 7637 keV level in Bi were determined. The resonance cross sections for n-production are: σγn = 275 ± 40 mb and 93 ± 14 mb for the 177 keV and 114 keV groups respectively. The resulting dynamic n-source is the most intense which can be produced by this method.

Original languageEnglish
Pages (from-to)503-507
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number3
StatePublished - 15 Nov 1991

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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