Measurement of neutron energy spectrum below 10 keV in an iron shield bombarded by deuterium-tritium neutrons and benchmark test of evaluated nuclear data from 14 MeV to 1 eV
Journal Article
·
· Nuclear Science and Engineering
OSTI ID:449588
- Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Dept. of Reactor Engineering
Iron is the most fundamental composition of structural and shield material for fusion reactors. Neutron spectra below 10 keV in an iron shield assembly bombarded by deuterium-tritium neutrons are measured with accuracy between 5 and 13% by adopting the slowing-down time method. The measurement supplemented previous spectrum measurements for higher energies so that the neutron spectrum in the whole energy range from 14 MeV down to 0.3 eV is now available. Benchmark tests of iron data in JENDL-3.1, JENDL-3.2, JENDL fusion file, and FENDL/E-1.0 were carried out in the whole energy range with experimental uncertainty at {approximately}10% by utilizing the present and previous experiments. As a result, it was found that cross-section data in the newer versions of JENDL were improved in terms of agreement with the experiment. Calculation with JENDL fusion file and FENDL/E-1.0 could predict neutron fluxes in the whole energy range within 20 and 15%, respectively. Possible over- and underestimations for nonelastic and elastic cross sections, respectively, at 14 MeV in all JENDLs were pointed out. It was confirmed that low-energy neutron fluxes were very sensitive to Q values for discrete inelastic cross sections of natural iron and {sup 57}Fe(n,n{prime}{sub 1}) reaction, which were not adequately treated in JENDL-3.1.
- OSTI ID:
- 449588
- Journal Information:
- Nuclear Science and Engineering, Journal Name: Nuclear Science and Engineering Journal Issue: 2 Vol. 125; ISSN NSENAO; ISSN 0029-5639
- Country of Publication:
- United States
- Language:
- English
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