Measurement and analysis of fast neutron spectra in iron, nickel and chromium.
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概要
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With a view to reassessing the currently established neutron cross sections for Fe, <BR>Ni and Cr, which are the main constituent elements of stainless steel, electron linac time-of-flight experiments were conducted to determine the energy spectra of neutrons in sample piles of the respective elements, in the energy range covering 10<SUP>0</SUP>10<SUP>3</SUP>keV levels. <BR>The spherical symmetry of neutron distribution in the piles was verified by determining through specimen activation the spatial distribution of neutrons in several radial directions around the target. <BR>The neutron spectra thus determined experimentally were compared with theoretical values derived by one-dimensional transport calculation using data contained in JENDL-2 <BR>and ENDF/B-IV. The resulting findings are as follows: (1) Both files call for revising the resonance parameters of Fe and Ni in the energy range below 100 keV. (2) For Fe, <BR>ENDF/B-IV requires supplementation in the range below 840 keV with additional cross section data on inelastic scattering. (3) For Cr, both files need reevaluation of the total cross section, notably in the energy range of 48 keV characterized by a series of large resonances. A neutron transmission measurement, performed additionally, proved the total cross section for Cr to be 30 to 40% higher than derived from JENDL-2 and from ENDF/B-IV.
- 一般社団法人 日本原子力学会の論文
著者
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Mori Takamasa
Department Of Molecular Design And Engineering Graduate School Of Engineering Nagoya University
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Yamamoto Shuji
Research Center For Cancer Prevention And Screening National Cancer Center
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KOBAYASHI Katsuhei
Research Reactor Institute, Kyoto University
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Kobayashi Katsuhei
Research Reactor Institute Kyoto Uninversity
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Kimura Itsuro
Research Reactor Institute Kyoto University
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Kanazawa Satoshi
Department Of Medicine Microbiology And Immunology Howard Hughes Medical Institute University Of Cal
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Nakagawa Masayuki
Japan Atomic Energy Research Institute
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Nishihara Hiroshi
Department Of Chemistry Faculty Of Science And Technology Keio University
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MORI Takamasa
Department of Nuclear Engineering, Kyoto University
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HAYASHI Shu
Research Reactor Institute, Kyoto University
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