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Precise life-time measurement of long-lived fission products using precision laser spectroscopy

Research Project

Project/Area Number 20H00365
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 31:Nuclear engineering, earth resources engineering, energy engineering, and related fields
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Takamine Aiko  国立研究開発法人理化学研究所, 開拓研究本部, 研究員 (10462699)

Co-Investigator(Kenkyū-buntansha) 田島 美典  国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 特別研究員 (20821838)
飯村 秀紀  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 原子力科学研究所 原子力基礎工学研究センター, 再雇用職員 (10343906)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥46,800,000 (Direct Cost: ¥36,000,000、Indirect Cost: ¥10,800,000)
Fiscal Year 2023: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2022: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2021: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2020: ¥32,760,000 (Direct Cost: ¥25,200,000、Indirect Cost: ¥7,560,000)
Keywordsレーザー分光 / LLFP / 核データ
Outline of Research at the Start

使用済み核燃料の最終的な処分で問題となる長寿命核分裂生成物の長寿命核分裂生成物の半減期は、極めて重要な核データであるにも拘らず、測定例は古い上に少ない。本研究の目的は、半減期の決定に必要なパラメータである原子数を高分解能レーザー分光法で測定し、同重体による誤差を排除する。さらに、測定対象の長寿命核分裂生成物に的を絞った核反応で試料を作製することにより、試料中に含まれる不純物核種を低減する 。これらによってZr-93をはじめとする長寿命核分裂生成物の半減期を精度良く決定し、半減期核データの信頼性を高める。

Outline of Final Research Achievements

Neutron reaction cross sections of long-lived fission products, which are an issue in the eventual disposal of spent nuclear fuel, have been obtained intensively in recent years. On the other hand, there are old and few examples of measurements of the half-life of long-lived fission products, despite the fact that this is extremely important nuclear data. The motivation of this study was to improve the reliability of nuclear data by re-measuring the half-lives of Zr-93 and other long-lived fission products using a new method. Zr-93 was produced in a way that reduced the amount of impurity nuclides in the sample by preparing the sample in a nuclear reaction targeted at the long-lived fission product to be measured. In addition, collinear laser spectroscopy for Zr isotopes was developed to determine the number of atoms that is a parameter necessary for the determination of the half-life.

Academic Significance and Societal Importance of the Research Achievements

本研究で対象とする使用済燃料・高レベル放射性廃棄物中の長寿命核分裂生成物は、その分離分析・核変換などにおいて重要な物質であり、その半減期の精査は長期間の核廃棄物リスクの見積もりにとって大きな意味を持つ。また、Zr同位体のレーザー分光はこれまで限られた範囲でのみ遂行されており、本研究で開発した方法により不安定核のオンラインビーム実験による希少Zr同位体の構造研究にアプローチすることで不安定核構造研究への適用も期待できるため、学術的にも意義深いものである。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Comments on the Screening Results   Annual Research Report
  • Research Products

    (9 results)

All 2023 2022 2021 Other

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

  • [Int'l Joint Research] Texas A&M Univeristy(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] TRIUMF(カナダ)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Offline development for collinear laser spectroscopy at the SLOWRI facility2023

    • Author(s)
      Tajima M.、Takamine A.、Iimura H.、Wada M.、Kimura S.、Niwase T.、Schury P.、Schuessler H.A.、Lassen J.、Ueno H.
    • Journal Title

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

      Volume: 541 Pages: 272-274

    • DOI

      10.1016/j.nimb.2023.05.031

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Offline ion source for laser spectroscopy of RI at the SLOWRI2021

    • Author(s)
      Tajima M.、Takamine A.、Wada M.、Ueno H.
    • Journal Title

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

      Volume: 486 Pages: 48-54

    • DOI

      10.1016/j.nimb.2020.10.013

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] Recent Progress of the Laser Spectroscopy Activities for the Study of Exotic Nuclei2023

    • Author(s)
      A. Takamine
    • Organizer
      International Conference on HYPERFINE 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Offline development for collinear laser spectroscopy at the SLOWRI facility2022

    • Author(s)
      M. Tajima, A. Takamine, H. Iimura, M. Wada, K. Sota, T. Niwase, P. Schury, H. A. Schuessler, J. Lassen, and H. Ueno
    • Organizer
      The 19th International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 不安定原子核の同位体シフト測定に向けた開発2021

    • Author(s)
      田島美典、高峰愛子、飯村秀紀
    • Organizer
      第17回AMO討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Isotope shift measurement project at the SLOWRI facility2021

    • Author(s)
      高峰愛子
    • Organizer
      東北大学 ELPH 研究会「電子散乱による原子核研究 ー陽子半径、不安定核の電荷密度分布を中心にー」
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] コリニアレーザー分光による四重極変形度測定を通した原子核構造研究に向けた開発II2021

    • Author(s)
      田島美典
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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