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Measurements of the Neutron Capture Cross Sections of Gold-197 and Uranium-238 Between 20 and 3500 keV
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1975
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Experimental Nuclear PhysicsNuclear PhysicsRadiation DetectionCapture Cross SectionEngineeringNuclear DataNuclear SecurityNuclear ReactorsGrey Neutron DetectorNatural SciencesNeutron SourceNuclear MaterialsNuclear ExperimentsInstrumentationUranium-238 Between 20Neutron ScatteringNuclear EngineeringCapture Cross Sections
Absolute measurements of the capture cross section of197Au were carried out in the 400- to 3500-keV energy range. Ratios of the capture cross sections of 238U to 197Au were measured from 20 to 1200 keV. Values for σn,y(238U) were derived by utilizing evaluated and present data for σ n,γ(197Au). The time-of-flight technique and a large liquid scintillator were used for the detection of the prompt capture gamma rays, and the Grey Neutron Detector, the Black Neutron Detector, and a 6Li-glass detector were used for the measurement and monitoring of the neutron flux.The present results support previous measurements of the 238U capture cross section and resolve some existing discrepancies. The absolute values for the capture cross section of 197Au agree well with evaluated data and measurements reported relative to the 235U fission cross section.