Measurement of time-dependent fast neutron energy spectra in a depleted uranium assembly.

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dc.contributor.authorWhittlestone, Sen_AU
dc.date.accessioned2007-11-22T04:18:57Zen_AU
dc.date.accessioned2010-04-30T04:33:25Zen_AU
dc.date.available2007-11-22T04:18:57Zen_AU
dc.date.available2010-04-30T04:33:25Zen_AU
dc.date.issued1980-10en_AU
dc.description.abstractTime-dependent neutron energy spectra in the range 0.6 to 6.4 MeV have been measured in a depleted uranium assembly. By selecting windows in the time range 0.9 to 82 ns after the beam pulse it was possible to observe the change of the neutron energy distributions from spectra of predominantly 4 to 6 MeV neutrons to spectra composed almost entirely of fission neutrons. The measured spectra were compared to a Monte Carlo calculation of the experiment using the ENDF/B-IV data file. At times and energies at which the calculation predicted a fission spectrum the experiment agreed with the calculation confirming the accuracy of the neutron spectroscopy system. However the presence of discrepancies at other times and energies suggested that there are significant inconsistencies in the inelastic cross sections in the 1 to 6 MeV range. The time response generated concurrently with the energy spectra was compared to the Monte Carlo calculation. From this comparison and from examination of time spectra measured by other workers using 235U and 237Np fission detectors it would appear that there are discrepancies in the ENDF/B-IV cross sections below 1 MeV. The predicted decay rates were too low below and too high above 0.8 MeV.en_AU
dc.identifier.citationWhittlestone, S. (1980). Measurement of time-dependent fast neutron energy spectra in a depleted uranium assembly. (AAEC/E490). Lucas Heights, NSW: Australian Atomic Energy Commission.en_AU
dc.identifier.govdoc391en_AU
dc.identifier.isbn0642597006en_AU
dc.identifier.otherAAEC-E-490en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/308en_AU
dc.language.isoen_auen_AU
dc.publisherAustralian Atomic Energy Commissionen_AU
dc.subjectNeutron spectraen_AU
dc.subjectUranium 238en_AU
dc.subjectDepleted uraniumen_AU
dc.subjectFission neutronsen_AU
dc.subjectInelastic scatteringen_AU
dc.subjectNeutron spectroscopyen_AU
dc.titleMeasurement of time-dependent fast neutron energy spectra in a depleted uranium assembly.en_AU
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