Investigation of the Prompt-Neutron Spectrum for Spontaneously-Fissioning 252Cf

  • W. P. Poenitz
  • T. Tamura
Conference paper

Abstract

The prompt-fission-neutron spectrum of 252Cf was investigated. The spectrum was measured with Black Neutron Detectors which have a well known efficiency. Considerations of various issues in such measurements lead to an experiment in which a time-calibration pulser, a random pulser, the neutron detector time-of-flight spectrum, the pulse-shape-discriminator gamma time-of-flight spectrum, and the detector-response spectra were simultaneously recorded for the prompt-fission neutrons, transmission through carbon, and shadowbars in a total-cross-section-type measurement. Corrections and associated uncertainties were applied for a large variety of effects which may have been overlooked in many of the previously reported measurements. Preliminary results indicate deviations from a Maxwellian shape toward a Watt-spectrum shape. Agreement is good with the shape differences relative to a Maxwellian from the recent theoretical calculation by Madland and Nix, however, a lower average energy was found.

Keywords

Average Energy Neutron Spectrum Flight Path Fission Fragment Residual Background 
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Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1983

Authors and Affiliations

  • W. P. Poenitz
    • 1
  • T. Tamura
    • 2
  1. 1.Argonne National LaboratoryArgonneUSA
  2. 2.Tohoku UniversitySendaiJapan

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