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Measurement of neutron energy spectrum at 180 degrees and improvement of spallation model

Research Project

Project/Area Number 17K14916
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Nuclear engineering
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Iwamoto Hiroki  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 J-PARCセンター, 研究副主幹 (50589744)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords核破砕反応 / 核破砕中性子 / 核反応モデル / 高エネルギー核分裂 / 飛行時間法 / 中性子エネルギースペクトル / 中性子検出器 / 放射線 / 量子ビーム / 加速器
Outline of Final Research Achievements

At the Japan Proton Accelerator Research Complex (J-PARC), we measured the energy spectrum of neutrons emitted from a mercury target irradiated by a proton beam accelerated to 3 GeV in the direction 180 degrees from the beam direction. The measured energy spectrum was found to be in good agreement with that obtained by the latest nuclear reaction model incorporated in the particle transport code PHITS. In addition, a new nuclear reaction model for high-energy fission was proposed and incorporated into PHITS. As a result of comparison with the experimental data, it is shown that the proposed model can reproduce the experimental data more accurately than the conventional model.

Academic Significance and Societal Importance of the Research Achievements

本研究成果により、高エネルギー陽子ビームを核破砕標的に入射させたときに発生する中性子の情報を定量的に測定でき、核反応モデルによる解析結果の妥当性を示すことができた。この成果は、高エネルギー加速器を用いた核破砕中性子源の遮蔽設計の高度化及び加速器駆動核変換システムの研究開発に貢献するものである。さらに、新たに提案した核反応モデルは、高エネルギー核分裂反応で発生する放射性核種の収量予測の精度向上に貢献する。

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (9 results)

All 2020 2019 2018 2017 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (5 results) (of which Int'l Joint Research: 2 results) Remarks (1 results)

  • [Journal Article] Measurement of thick target neutron yield at 180°for a mercury target induced by 3-GeV protons2020

    • Author(s)
      Matsuda Hiroki、Iwamoto Hiroki、Meigo Shin-ichiro、Takeshita Hayato、Maekawa Fujio
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

      Volume: 483 Pages: 33-40

    • DOI

      10.1016/j.nimb.2020.09.012

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Estimation of uncertainty in lead spallation particle multiplicity and its propagation to a neutron energy spectrum2019

    • Author(s)
      Iwamoto Hiroki、Meigo Shin-Ichiro
    • Journal Title

      Journal of Nuclear Science and Technology

      Volume: 57 Issue: 3 Pages: 276-290

    • DOI

      10.1080/00223131.2019.1671912

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Unified description of the fission probability for highly excited nuclei2018

    • Author(s)
      Iwamoto Hiroki、Meigo Shin-ichiro
    • Journal Title

      Journal of Nuclear Science and Technology

      Volume: 56 Issue: 2 Pages: 160-171

    • DOI

      10.1080/00223131.2018.1539351

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 高エネルギー粒子輸送計算における核分裂確率の統一的記述2018

    • Author(s)
      岩元大樹、明午伸一郎
    • Organizer
      日本原子力学会2018年秋の大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Improvement of a high-energy fission model for spallation reactions2018

    • Author(s)
      H. Iwamoto, S-I. Meigo
    • Organizer
      14th Specialists' workshop on Shielding aspects of Accelerators, Targets, and Irradiation Facilities (SATIF-14)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Measurement of the energy spectrum of spallation neutron emitted to the most backward angle of 180° produced from thick mercury target irradiated with 3 GeV protons2018

    • Author(s)
      H. Matsuda1, S-I Meigo, H. Iwamoto, H. Takeshita
    • Organizer
      14th Specialists' workshop on Shielding aspects of Accelerators, Targets, and Irradiation Facilities (SATIF-14)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] J-PARC MLF水銀標的から放出される180度方向核破砕中性子エネルギースペクトルの測定2018

    • Author(s)
      松田洋樹、明午伸一郎、岩元大樹
    • Organizer
      日本原子力学会2018年春の年会
    • Related Report
      2017 Research-status Report
  • [Presentation] J-PARC MLF水銀標的からの後方角核破砕中性子のスペクトル測定2017

    • Author(s)
      松田洋樹、明午伸一郎、岩元大樹
    • Organizer
      日本原子力学会2017年秋の大会
    • Related Report
      2017 Research-status Report
  • [Remarks] 2020年度核データ部会賞,学術賞; 高励起原子核の核分裂確率の統一的な記述

    • URL

      http://www.aesj.or.jp/~ndd/ndnews/pdf128/No128-02.pdf

    • Related Report
      2020 Annual Research Report

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Published: 2017-04-28   Modified: 2022-01-27  

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