Measurements and analyses of angular neutron flux spectra on graphite and lithium-oxide slabs irradiated with 14.8MeV neutrons.

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概要

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• Angular neutron fluxes leaking from the surface of lithium-oxide and graphite slab assemblies have been measured with irradiation of D-T neutrons. The spectrum measurement was performed using the time-of-flight technique with an NE213 scintillation detector. The thicknesses of the slabs were 0.6 to 5 mean free path for 14.8 MeV neutrons, and the measured leaking angles of the angular fluxes were 0.0°, 12.2°, 24.9°, 41.8° and 66.8°. The experimental results have been compared with the results calculated by the continuous energy Monte Carlo transport code MCNP, using the data in the JENDL-3PR1, -3PR2, and ENDF/B-V nuclear data files. The comparisons between the experimental and calculated results show that the data of <SUP>7</SUP>Li in JENDL-3PR2 is improved for the secondary emission spectra of the 4.63 MeV level and (n, 2n) reactions; the angular distributions of 3rd- and 4th-level inelastic reactions of C in the JENDLs are questionable. The thickness dependences for high energy neutrons also suggest that the total cross section of <SUP>7</SUP>Li and the elastic cross sections of C are slightly inadequate.

• 一般社団法人 日本原子力学会の論文

著者

• YAMAGUCHI Seiya

  Department of Nuclear Engineering, Japan Atomic Energy Research Institute

関連論文

• Measurements and analyses of angular neutron flux spectra on graphite and lithium-oxide slabs irradiated with 14.8MeV neutrons.

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