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Study of MA delayed neutrons aiming at improving the safety of present and next-generation nuclear reactors

Research Project

Project/Area Number 15K17663
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Minato Futoshi  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, 研究職 (00554065)

Research Collaborator Nagaya Yasunobu  
Demetriou Paraskevi  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2017: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords遅発中性子 / β崩壊 / 原子核構造 / 核分裂片 / ベータ崩壊 / 核分裂 / 原子核理論 / 核分裂収率 / 遅発中性子の評価 / ベータ崩壊の理論計算 / 核構造 / 崩壊熱 / 核データ
Outline of Final Research Achievements

We developed a new numerical calculation code based on nuclear theoretical models to derive the number of delayed neutrons emitted from fission fragments of minor actinides (MA), which are difficult to measure experimentally. In order to predict nuclear beta-decays, which trigger the delayed neutron emission from fission fragments, in a high accuracy, we introduced the first forbidden transitions, isospin T=0 finite-range pairing, and nuclear deformation into our model. As a result, we could develop new code capable of calculating delayed neutrons considering aforementioned three characteristics. This is the world's first achievement in terms of beta-decay calculations. This product enables us to calculate beta-decay and delayed neutron in a higher accuracy than conventional models calculating beta-decay.

Academic Significance and Societal Importance of the Research Achievements

核分裂によって生み出される核分裂生成物から放出される放射線を、実験で全て測定することは現状難しいことが知られている。本研究の成果は、その放射線を、最新の理論モデルを用いて求めることを可能にしたことである。このことにより、原子炉の稼働で生成される副産物であるマイナーアクチニド(MA)から放出される遅発中性子の量を、予測するための基礎を構築することができた。原子炉の安全運転に重要な遅発中性子を理論的に予測する重要な成果である。
また本成果は、使用済核燃料から放出される崩壊熱の高精度予測や、宇宙における重元素合成など、原子炉の安全性向上以外の研究においても、今後応用が期待される。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (12 results)

All 2019 2018 2017 2016 2015

All Journal Article (3 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results,  Acknowledgement Compliant: 1 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 4 results)

  • [Journal Article] Neutron energy dependence of delayed neutron yields and its assessments2018

    • Author(s)
      Minato Futoshi
    • Journal Title

      Journal of Nuclear Science and Technology

      Volume: 55 Issue: 9 Pages: 1054-1064

    • DOI

      10.1080/00223131.2018.1470947

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Proton-neutron random phase approximation studied by the Lipkin-Meshkov-Glick model in the SU(2)xSU(2) group2017

    • Author(s)
      F. Minato
    • Journal Title

      Acta Physica Polonica B; proceedings Supplement

      Volume: 10 Issue: 1 Pages: 131-138

    • DOI

      10.5506/aphyspolbsupp.10.131

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Calculation of beta decay half-lives and delayed neutron branching ratios of fission fragments with Skyrme-QRPA2016

    • Author(s)
      F. Minato
    • Journal Title

      EPJ Web of Conferences (Internet)

      Volume: 印刷中

    • NAID

      120006502132

    • Related Report
      2015 Research-status Report
    • Open Access
  • [Presentation] 微視的モデルによる系統的β崩壊計算と今後の課題2019

    • Author(s)
      湊 太志
    • Organizer
      核データと重元素合成を中心とする宇宙核物理研究会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] コアの偏極効果を取り入れたβ崩壊と遅発中性子の研究2018

    • Author(s)
      湊 太志
    • Organizer
      5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan (Hawaii 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 最新の評価済崩壊データを用いた遅発中性子収率の入射中性子エネルギー依存性2018

    • Author(s)
      湊 太志
    • Organizer
      日本原子力学会2018年秋の大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 応用に向けた微視的核構造モデルによる$$beta$$崩壊と遅発中性子研究2018

    • Author(s)
      湊 太志
    • Organizer
      理化学研究所研究会「重力波観測時代のrプロセスと不安定核」
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 奇奇核における三体模型; コア励起は何を変えたのか?2018

    • Author(s)
      湊 太志
    • Organizer
      Recent Progress of Nuclear Structure and Reaction Theory
    • Related Report
      2018 Annual Research Report
  • [Presentation] Second proton-neutron random phase approximation studied by the Lipkin model in SU(4) basis2016

    • Author(s)
      F. Minato
    • Organizer
      First Tsukuba-CCS-RIKEN joint workshop on microscopic theories of Nuclear Structure and Dynamics
    • Place of Presentation
      筑波大学(茨城県つくば市)
    • Year and Date
      2016-12-15
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Second proton-neutron Random Phase Approximation Studied by the Lipkin Model in the SU(4) basis2016

    • Author(s)
      F. Minato
    • Organizer
      XXIII Nuclear Physics Workshop
    • Place of Presentation
      Kazimierz-Dolny, Poland
    • Year and Date
      2016-09-28
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 準粒子乱雑位相近似法を適用したベータ崩壊データベースの作成2016

    • Author(s)
      湊太志
    • Organizer
      日本原子力学会2016年春の大会
    • Place of Presentation
      東北大学(宮城県仙台市)
    • Year and Date
      2016-03-28
    • Related Report
      2015 Research-status Report
  • [Presentation] ガモフテラー遷移とテンソル相関2015

    • Author(s)
      湊太志
    • Organizer
      高エネルギー加速器研究機構理論センター研究会「原子核・ハドロン物理の理論的課題と将来」
    • Place of Presentation
      高エネルギー加速器研究機構(茨城県つくば市)
    • Year and Date
      2015-11-25
    • Related Report
      2015 Research-status Report
    • Invited

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Published: 2015-04-16   Modified: 2020-03-30  

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