Measurement and analysis of neutron spectrum in a molybdenum pile.

概要

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In order to assess the neutron cross section for Mo, the angular neutron spectrum at r=15 cm and μ=0 in a spherical Mo pile of 60 cm I.D. was measured by the linac timeofflight method. The result was compared with the theoretical calculations which were predicted by making use of group constants produced from JENDL-1 (MAT=1420) and ENDF/B-IV (MAT=1287).<BR>The predicted spectrum from the ENDF/B-IV data gives higher flux by about 30% than the measured one in the energy region above 500 keV, while the spectrum calculated from the JENDL-1 data is in better agreement with the measured one.<BR>Substitution of four kinds of partial cross sections from JENDL-1 into ENDF/B-IV was tried and the results were compared with each other. These calculations show that the discrepancy between the measured spectrum and the predicted one from the ENDF/B-IV data is mainly due to the fact that the ENDF/B-IV data has no discrete levels of inelastic scattering of neutrons for Mo.
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