Study on the evaluation of fast-neutron energy spectrum of the Hiroshima atomic bomb
| Project/Area Number |
11480125
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
SHIBATA Seiichi Kyoto University, Research Reactor Institute, Professor, 原子炉実験所, 教授 (80110708)
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| Co-Investigator(Kenkyū-buntansha) |
SHINOHARA Atsushi Osaka University, Graduate School of Science, Professor, 理学部, 教授 (60183050)
TAKAMIYA Koichi Kyoto University, Research Reactor Institute, Research Associate, 原子炉実験所, 助手 (70324712)
OHKUBO Yoshitaka Kyoto University, Research Reactor Institute, Associate Professor, 原子炉実験所, 助教授 (70201374)
SHIBATA Tokushi High Energy Accelerator Research Organization, Professor, 教授 (80028224)
SHIZUMA Kiyoshi Hiroshima University, Department of Engineering, Professor, 工学部, 教授 (10127657)
高田 實彌 京都大学, 原子炉実験所, 助手 (10115868)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥16,000,000 (Direct Cost: ¥16,000,000)
Fiscal Year 2000: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1999: ¥13,500,000 (Direct Cost: ¥13,500,000)
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| Keywords | atomic bomb / neutron / cross section / DS86 / ^<60>Co / ^<63>Ni / gamma-ray spectrometry / liquid scintillation counting |
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| Research Abstract |
The neutron spectra correlated to the distance from the hypocenter are given in the Dosimetry System 1986 (DS86). So far no experimental results for the fast neutrons have been reported for the Hiroshima atomic bomb except for the early measurement of ^<32>P.The detailed analysis of several nuclei produced by the thermal-neutron capture reaction suggests that the derived neutron spectrum for the Hiroshima atomic bomb is much harder than the spectrum given in DS86. The measurement of ^<152>Eu and ^<60>Co also suggests that systematic errors exist in the DS86 neutron spectrum. The recent measurements of ^<36>Cl for Hiroshima, Nagasaki and the reactor experiment have shown that the source neutrons for the Hiroshima atomic bomb could be different from the one given in DS86. Thus the direct measurement of the fast neutrons for the Hiroshima atomic bomb is particularly desirable.
In the present work, the reaction cross sections for ^<63>Cu(n, p)^<63>Ni were measured using the Dynamitron accelerator at the Fast Neutron Laboratory (FNL) of Tohoku University, which is indispensable as a basic nuclear data for the evaluation of neutron energy spectrum. After neutron irradiation, the ^<63>Ni was chemically separated by electrolysis, anion exchange and solvent extraction. The ^<63>Ni was determined by liquid scintillation counting. As a result, the fine structure in the excitation function was found, whose cause is investigated in the relation to the reaction mechanism. Also, ^<63>Ni was extracted from the Hiroshima copper samples by the same chemical procedure. The ^<63>Ni counting is still under way.
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Report
(3 results)
Research Products
(9 results)
