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An integral test of the inelastic cross sections of Pb and Mo using measured neutron spectraComparison of measurements and calculations of fast neutron spectra from a radioactive neutron source inside spheres of Mo or Pb and from a cylindrical reactor containing a thick Pb or Mo reflector are used as a test of ENDF cross sections. The sphere leakage spectra were measured at a sphere-to-spectrometer distance of 2 meters using a 54 Ci spherical Am-Be neutron source. Reactor leakage spectrum measurements were made at the surface of the ZP-1 reactor when bare, with a Pb radial reflector 21 cm thick, and with a metallic Mo radial reflector 10 cm thick. In the case of the thin Mo sphere there is agreement between the calculation and measurement. The Pb calculation is much lower than the measurement except at the highest neutron energy. Two-dimensional calculations of reactor spectra result indicate that the reactor source is reasonably well known. Significant differences in leakage spectrum shape for both Mo and Pb reflectors suggest that there are large uncertainties in the inelastic cross sections for Pb and some for Mo.
Document ID
19720018927
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Shook, D. F. (NASA Lewis Research Center Cleveland, OH, United States)
Fieno, D. (NASA Lewis Research Center Cleveland, OH, United States)
Ford, C. H. (NASA Lewis Research Center Cleveland, OH, United States)
Wrights, G. N. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
June 22, 1972
Subject Category
Physics, Atomic, Molecular, And Nuclear
Report/Patent Number
E-6965
NASA-TM-X-68074
Meeting Information
Meeting: Ann. Meeting of the Am. Nucl. Soc.
Location: Las Vegas, NV
Country: United States
Start Date: June 18, 1972
End Date: June 22, 1972
Accession Number
72N26577
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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