Development of 3He solid state detectors epithermal neutron spectrometer

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2 Scopus citations


A neutron spectrometer was developed for measuring the neutron energy in the range from 1-300 keV. Its fabrication was based on the 3He(n,p)3H reaction, with two Si solid state detectors used for measuring the energy of the two charged particles. The sum of the energies of the two particles is the neutron energy En plus the reaction Q-value (764 keV). The FWHM detector resolution is ≈3%. The detector efficiency, ≈3% for thermal neutrons, is proportional to 1 E (i.e., to the detection reaction cross section). Cooling improves the resolution. To avoid obscuring of the low keV energy range by thermal neutrons, the detector was covered with a 1 mm layer of Cd. Background due to neutron interaction with the Si detector, and with the detector construction materials and gamma rays, was removed by repeating the foreground measurement with no 3He in the detector. Neutron spectra were measured both with a moderated 252Cf source and with an epithermal beam at the Brookhaven Medical Research Reactor (BMRR). Results were in good agreement with Monte Carlo calculations using the MCNP code.

Original languageEnglish
Pages (from-to)553-560
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number3
StatePublished - 10 May 1992
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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