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Analysis of t+p reaction using first-principles calculations of nuclear forces aimed at solving the tritium contaminated water problem at the Fukushima nuclear power plant

Research Project

Project/Area Number 20K03967
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionHigh Energy Accelerator Research Organization (2024)
Tokyo University of Agriculture and Technology (2021-2023)
Niigata University (2020)

Principal Investigator

Aoyma Shigeyoshi  大学共同利用機関法人高エネルギー加速器研究機構, 計算科学センター, 教授 (60311528)

Project Period (FY) 2020-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords核力第一原理計算 / 福島トリチウム汚染水問題 / t+p反応 / 第一原理計算 / 核反応 / 少数体系 / 散乱状態
Outline of Research at the Start

福島第一原発の放射性原子核汚染水問題は、現代日本の抱える大きな問題である。放射性原子核は吸着法等により水から分離可能であり、その除染処理が東京電力により進められている。しかしながら、トリチウム(三重水素)は陽子と電子の数が水素と同じであるので、化学的手法によって水から分離することができずに最後にトリチウム水が残る。現在でも、原発建屋への地下水の流入は続き、汚染水が日々増大し続けているが、問題解決のための糸口すら見出せていない状況である。
この問題解決を子供や孫の世代に先送りしないために、本研究では、新たな可能性として、トリチウムそのものを核種変換により消失させるための基礎研究を行う。

Outline of Final Research Achievements

The impetus for this research was the discovery in a previous study that 0+ and 0- undergo nearly 100% nuclide transmutation in the low-energy region just above the t+p threshold. In the low-energy region, the relative motion of p-waves 1- and 2- competes, so their effects also had to be considered at the same time. However, 2-, which has a large angular momentum, requires a large amount of calculations compared to 0+ and 0-, making it a challenging task. In this study, large-scale numerical calculations using a supercomputer revealed that although 1- and 2- were not completely transmuted, 1- and 2- are also in a resonant state, and nuclide transmutation occurs rather easily through this resonance. In particular, it was found that in the 2- resonance region, nuclide transmutation occurs at a level several time larger than that of 0+ and 0-.

Academic Significance and Societal Importance of the Research Achievements

0+と0-がt+pしきい値の少し上の低エネルギー領域でほぼ100%の核種変換することに加えて、若干の懸念事項であった1-や2-は陽子をトリチウムに当てた時の核種変換の増大方向の効果であることが判明した。特に2-の共鳴エネルギー近辺で陽子をトリチウムに当てると核種変換が容易に起こることが判明した。実際には、加速器で陽子を水中のトリチウムにどのように当てるのかとい工業技術的な問題はあるが、その前段階の基礎研究としては、陽子を当てさえすればトリチウムがなくなるということを明らかにして従来の化学的手法以外にもトリチウム汚染数問題を解決する可能性の提案できたことに意義がある。

Report

(6 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (7 results)

All 2025 2024 2022 2021 2020

All Presentation (7 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Presentation] Ab-initio reaction calculation for t(p,n)3He2025

    • Author(s)
      青山茂義
    • Organizer
      Single-particle and collective motions from nuclear many-body correlation(PCM2025)
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Complex Scaling Methodによる11λHe,10Heと11Liの同時分析2024

    • Author(s)
      青山茂義
    • Organizer
      日本物理学会年次大会(2024)
    • Related Report
      2024 Annual Research Report
  • [Presentation] 量子アニーリングコンピュータで可能にする精密N体計算理論への挑戦2024

    • Author(s)
      青山茂義
    • Organizer
      日本物理学会春季大会
    • Related Report
      2023 Research-status Report
  • [Presentation] A study of two special properties in t+p reaction by using an ab-initio four body reaction calculation2022

    • Author(s)
      Shigeyoshi Aoyama
    • Organizer
      6th Topical Workshop on Modern Aspects in Nuclear Structure
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A fundamental research for the tritium contaminated water problem by nuclear ab-initio calculation2021

    • Author(s)
      S. Aoyama
    • Organizer
      CCS International Symposium, Tsukuba, Oct. 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] The 8th Asia-Pacific Conference on Few-Body Problems in Physics2021

    • Author(s)
      Shigeyoshi Aoyama
    • Organizer
      A fundamental research for the Fukushima tritium contaminated water problem by the ab-initio nuclear reaction calculation
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Ab initio calculation of nuclear clusters2020

    • Author(s)
      Shigeyoshi Aoyama
    • Organizer
      CCS International Symposium
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2026-01-16  

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