Improvemnt on shielding design of electron accelerator by systematic measurement of polarization dependence for secondary particles from photonuclear reaction

• Project/Area Number: 20K12487
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 80040:Quantum beam science-related
• Research Institution: High Energy Accelerator Research Organization
• 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)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• 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 / 中性子スペクトル / レーザー逆コンプトン / 角度分布 / 電子加速器遮蔽 / 中性子 / 偏光 / エネルギー分布

Outline of Research at the Start

本研究ではレーザー逆コンプトン散乱施設において得られる、偏光方向がそろった単一エネルギーの光子を用いて、光子と標的核との核反応による二次粒子の生成機構について研究を行う。この実験で得られる二次粒子の生成データは、医学・理学・工学で用いられている数１０ MeV(メガ電子ボルト)の電子加速器に対する遮蔽設計において放射線・放射能の生成を見積もるために必要である。本研究では、二次粒子のうち光子の偏光の影響を受ける成分と受けない成分を分離して、そのエネルギーと角度分布を広範に測定し、系統的データを得る。このデータに基づき光子の核反応モデルの改良を行い、電子加速器施設に対する遮蔽設計の高度化をはかる。

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.

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。

Research Products

• [Journal Article] The comparison of nuclear data and experimental results for photoneutron spectra on Ta, W, and Bi targets for 17 MeV photons (2023)
  • Author(s): T. Nguyen, T. Sanami, H. Yamazaki, Y. Sakaki, T. Itoga, Y. Kirihara, K. Sugihara, M. Faiz, S. Miyamoto, S. Hashimoto, Y. Asano
  • Journal Title: Proceedings of Symposium on Nuclear Data 2022, 17th - 18th November, KINDAI University, Osaka, Japan (Accepted) Volume: -
  • Open Access
• [Journal Article] Target mass dependence of photoneutron spectrum for 16.6MeV photons on medium-heavy mass targets (2023)
  • Author(s): Toshiya Sanami, Tyuet Kim Tran, Hiroshito Yamazaki, Toshiro Itoga, Yoichi Kirihara, Yoshihito Namito, Yasuhito Sakaki, Shuji Miyamoto, and Yoshihiro Asano
  • Journal Title: EPJ Web of Conferences , Proceedings of International Conference on Nuclear Data for Science and Technology (Sacramento, CA, United States of America, July 24 - 29, 2022) (Accepted) Volume: -
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Comparison of double-differential cross section between nuclear data library and experimental data for photoneutron production (2023)
  • Author(s): Tran Kim Tuyet, Toshiya Sanami, Hirohito Yamazaki
  • Journal Title: EPJ Web of Conferences , Proceedings of International Conference on Nuclear Data for Science and Technology (Sacramento, CA, United States of America, July 24 - 29, 2022) (Accepted) Volume: -
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Comparison of double- differential cross section between JENDL/PD-2016.1 and experimental data for photo-neutron production of medium-heavy nuclei at 16.6 MeV (2022)
  • Author(s): T.K.Tuyet, Y.Sakaki, T.Sanami, H.Yamazaki, T.Itoga, A.Takeuchi, S.Miyamoto and Y.Asano
  • Journal Title: Proceedings of Symposium on Nuclear Data 2020, 26th - 27th November, RIKEN Nishina Center, RIKEN Wako Campus, Wako, Saitama, Japan Volume: JAEA-Conf 2021-001 Pages: 189-194
  • Open Access
• [Journal Article] レーザー逆コンプトン光子の光中性子生成二重微分断面積測定への応用 (2022)
  • Author(s): 佐波俊哉, Tran Tuyet, Nguyen Thuong, 山崎寛仁, 糸賀俊朗, 桐原陽一, 波戸芳仁, 中島宏, 宮本修治, 橋本智, 浅野芳裕
  • Journal Title: Proceedings of the 19th Annual Meeting of Particle Accelerator Society of Japan, October 18 - 21, 2022, Online (Kyushu University) Volume: PASJ2022 WEOA09 Pages: 70-74
  • Open Access / Int'l Joint Research
• [Journal Article] Energy and angular distribution of photo-neutrons for 16.6 MeV polarized photon on medium?heavy targets (2021)
  • Author(s): Kim Tuyet Tran、Sanami Toshiya、Yamazaki Hirohito、Itoga Toshiro、Takeuchi Akihiro、Namito Yoshihito、Miyamoto Shuji、Asano Yoshihiro
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Volume: 989 Pages: 164965-164965
  • DOI: 10.1016/j.nima.2020.164965
  • Peer Reviewed / Open Access
• [Journal Article] Comparison of double- differential cross section between JENDL/PD-2016.1 and experimental data for photo-neutron production of medium-heavy nuclei at 16.6 MeV (2021)
  • Author(s): T.K.Tuyet, Y.Sakaki, T.Sanami, H. Yamazaki et al.
  • Journal Title: Proceedings of Symposium on Nuclear Data 2020, 26th - 27th November. (accepted) Volume: -
  • Peer Reviewed / Open Access
• [Presentation] The comparison of nuclear data, theoretical calculations, and experimental results for photoneutron spectra on Ta, W, and Bi targets for 17 MeV photons (2023)
  • Author(s): Thuong Thi, Hong Nguyen, Toshiya Sanami, Hirohito Yamazaki, Yasuhito Sakaki, Toshiro Itoga, Yoichi Kirihara, Kenta Sugihara, Shuji Miyamoto, Satoshi Hashimoto, Yoshihiro Asano
  • Organizer: 日本原子力学会2023年春の大会
• [Presentation] Comparison of double-differential cross section between nuclear data library and experimental data for photoneutron production (2022)
  • Author(s): Tran Kim Tuyet, Toshiya Sanami, Hirohito Yamazaki
  • Organizer: 15th International conference on Nuclear Data for Science and Technology (ND2022)
  • Int'l Joint Research
• [Presentation] Target mass dependence of photoneutron spectrum for 16.6MeV photons on medium-heavy mass targets (2022)
  • Author(s): Toshiya Sanami, Tyuet Kim Tran, Hiroshito Yamazaki, Toshiro Itoga, Yoichi Kirihara, Yoshihito Namito, Yasuhito Sakaki, Shuji Miyamoto, and Yoshihiro Asano
  • Organizer: 15th International conference on Nuclear Data for Science and Technology (ND2022)
  • Int'l Joint Research
• [Presentation] Measurement of photoneutron spectra for 17 MeV linearly polarized photon on Ta, W, and Bi targets (2022)
  • Author(s): グエン トウオン, 佐波 俊, 山崎 寛仁, 糸賀 俊朗, 桐原 陽一, 杉原 健太, モハンマドジン モハンマドファイズ, 宮本 修治, 浅野 芳裕
  • Organizer: 日本原子力学会2022年秋の大会
• [Presentation] The comparison of nuclear data and experimental results for photoneutron spectra on Ta, W, and Bi targets for 17 MeV photons (2022)
  • Author(s): Thuong Nguyen
  • Organizer: 2022 Symposium on Nuclear Data / 2022年度核データ研究会
• [Presentation] Impact of photo-neutron spectrum shape for Pb(γ,xn) on shielding design (2022)
  • Author(s): Tran Kim Tuyet, Toshiya Sanami, Hirohito Yamazaki
  • Organizer: 14th International Conference on Radiation Shielding and 21st Topical Meeting of the Radiation Protection and Shielding Division
  • Int'l Joint Research
• [Presentation] レーザー逆コンプトン光子の光中性子生成二重微分断面積測定への応用 (2022)
  • Author(s): 佐波俊哉, Tran Tuyet, Nguyen Thuong, 山崎寛仁, 糸賀俊朗, 桐原陽一, 波戸芳仁, 中島宏, 宮本修治, 橋本智, 浅野芳裕
  • Organizer: 第19回日本加速器学会年会 WEOA09 2022/10/20 オンライン
• [Presentation] Impact of photo-neutron spectrum shape for Pb(γ,xn) on shielding design (2022)
  • Author(s): T.K.Tuyet, T.Sanami, H. Yamazaki et al
  • Organizer: ICRS14/RPSD 2020 at Seattle. This presentation was accepted but this conference was postponed to 2022 due to COVID-19.
  • Int'l Joint Research
• [Presentation] Target mass dependence of photoneutron spectrum for 16.6MeV photons on medium-heavy mass targets (2022)
  • Author(s): T.Sanami, T.K.Tuyet, H. Yamazaki et al
  • Organizer: 15th International Conference on Nuclear Data for Science and Technology (ND2022)This presentation was accepted but this conference was postponed to 2022 due to COVID-19.
  • Int'l Joint Research
• [Presentation] Comparison of double-differential cross section between nuclear data library and experimental data for photoneutron production (2022)
  • Author(s): T.K.Tuyet, T.Sanami, H. Yamazaki et al
  • Organizer: 15th International Conference on Nuclear Data for Science and Technology (ND2022)This presentation was accepted but this conference was postponed to 2022 due to COVID-19.
  • Int'l Joint Research
• [Presentation] Comparison of double- differential cross section between JENDL/PD-2016.1 and experimental data for photo-neutron production of medium-heavy nuclei at 16.6 MeV (2021)
  • Author(s): T.K.Tuyet, Y.Sakaki, T.Sanami, H. Yamazaki et al.
  • Organizer: Symposium on Nuclear Data 2020, 26th - 27th November
• [Presentation] Photon energy dependence of photo- neutron production from the 197Au(γ,xn) reaction (2021)
  • Author(s): T.K.Tuyet, T.Sanami, H. Yamazaki et al.
  • Organizer: 2021 Annual Meeting of AESJ, Online meeting, 19th March
• [Presentation] Measurement of photoneutron energy spectrum with Laser Compton back scattering photon at NewSUBARU BL-01 (2021)
  • Author(s): T.K.Tuyet, T.Sanami, H. Yamazaki et al.,
  • Organizer: 35th Symposium on Radiation Detector and Their Uses, KEK, 2021 20th-22th January
• [Presentation] Measurement of photoneutron en- ergy spectrum with Laser Compton back scattering photon at NewSUBARU BL-01 (2021)
  • Author(s): T.K.Tuyet, T.Sanami, H. Yamazaki et al.,
  • Organizer: 35th Symposium on Radiation Detector and Their Uses, KEK, 2021 20th-22th January
• [Presentation] Double differential cross-section measurement of the medium-heavy nuclei (γ,xn) reaction for 16.6 MeV po- larized photons (2020)
  • Author(s): T.K.Tuyet, T.Sanami, H. Yamazaki et al.
  • Organizer: 2020 Fall meeting of AESJ, Online meeting, 16th September
• [Presentation] Comparison of double- differential cross section between JENDL/PD-2016.1 and experimental data for photo-neutron production of medium-heavy nuclei at 16.6 MeV (2020)
  • Author(s): T.K.Tuyet, Y.Sakaki, T.Sanami, H. Yamazaki et al.
  • Organizer: Sympo- sium on Nuclear Data 2020, Riken, 26th - 27th November.
• [Presentation] Impact of photo-neutron spectrum shape for Pb(γ,xn) on shielding design (2020)
  • Author(s): T.K.Tuyet, T.Sanami, H. Yamazaki et al
  • Organizer: ICRS14/RPSD 2020 at Seattle. This presentation was accepted but this conference was postponed to 2022 due to COVID-19.
  • Int'l Joint Research
• [Book] Study on neutron anisotropic emission from photonuclear reaction in giant dipole resonance energy region (2021)
  • Author(s): T.K.Tuyet
  • Total Pages: 232
  • Publisher: 博士学位論文 総合研究大学院大学
• [Remarks] KEK 放射線科学センター・アーカイブス
  • URL: http://rcwww.kek.jp/research/archives.html