2022 Fiscal Year Final Research Report
Improvemnt on shielding design of electron accelerator by systematic measurement of polarization dependence for secondary particles from photonuclear reaction
| Project/Area Number |
20K12487
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 80040:Quantum beam science-related
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
Sanami Toshiya 大学共同利用機関法人高エネルギー加速器研究機構, 放射線科学センター, 教授 (90321538)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 光核反応 / 二重微分断面積 / 電子加速器遮蔽設計 / レーザー逆コンプトン散乱 |
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| Outline of Final Research Achievements |
Secondary particle production from photon-induced nuclear reactions was studied with considering the dependence of the incident photon polarization. Systematic experimental data of neutron production double-differential cross sections were obtained for incident photon energies from 13 to 20 MeV. The data proved existence of polarization-dependent and -independent components from their spectrum shape, and clarified how the polarization-dependent component varies depending on the energy, emission angle, and target nucleus.The data were compared with the results of calculations of nuclear reaction models used for particle emission from compound nuclei and data libraries. The comparison showed problems in the description of the polarization-dependent component. The effect of the polarization-dependent component on the dose after penetrating concrete shielding wall was obtained by simulation. These results contribute to the improvement of the shielding design of electron accelerators.
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| Free Research Field |
放射線計測、核データ、高エネルギー加速器遮蔽
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| Academic Significance and Societal Importance of the Research Achievements |
光核反応の研究は1950年代から行われてきているが、単一エネルギーの入射光子に対して、偏光依存の中性子生成二重微分断面積データを与えたのは初めてである。このデータによりこれまで出来なかった微分データによる理論計算とデータライブラリの検証が可能になった。また、この光核反応は国内で多数利用されている電子加速器において、遮蔽設計を行うために重要である。今回のデータを利用し、これまで考慮に入れられて無かった偏光依存成分が遮蔽設計へ及ぼす影響を明らかにすることが出来た。
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