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A new measurement of 8Li(a,n)11B-reaction cross section

Research Project

Project/Area Number 17K05472
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionOsaka Electro-Communication University

Principal Investigator

MIZOI YUTAKA  大阪電気通信大学, 共通教育機構, 教授 (30388392)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywordsビッグバン元素合成 / 超新星爆発 / rプロセス / 不安定核反応 / 天体核反応 / RIビーム / 原子核反応 / 励起関数 / γ線検出器 / 反応断面積 / 励起状態 / 天体核反応断面積 / 元素合成 / 宇宙核物理学 / ビッグバン元素構成 / 実験核物理
Outline of Final Research Achievements

Nucleosynthesis processes taking place after a big bang and a supernova explosion are studied for many decades. Recently, studies of nuclear reactions concerning to cosmological nucleosynthesis using unstable-nuclei beams are intensively performed with development of accelerators and RI-beam techniques, in addition to studies using stable-nuclei beams. Especially, it is considered that 8Li might be a key element and the 8Li(α,n)11B should be a key reaction to produce heaver elements more than mass number of 12. Many research groups were published its reaction cross-section data, but we have not yet had any reliable result. We have controversial differences in these published cross-section data. The reason of their differences are not resolved. By the present work, we shows the clue to resolve the controversial difference and determine the reliabilities of their cross section data.

Academic Significance and Societal Importance of the Research Achievements

我々の世界を成す元素の起源を明らかにすることは、宇宙開闢から現在に至る宇宙の進化の謎を解き明かすことにつながる。元素は、宇宙の進化の過程で基本的な粒子から合成されてきたと考えられており、元素合成に関わる原子核反応についての研究が盛んにおこなわれている。特に8Liという放射性同位元素の関わる原子核反応の重要性が指摘され、我々も含め世界中の研究者がその原子核反応の高精度の測定を試みてきた。それらの測定結果には、実験方法に起因すると考えられる不一致が見られ、その不一致が元素合成の理論の精度に影響を与えている。本研究はその不一致の原因を解明するための新たな実験を行い、解明のヒントを得ることができた。

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

    (20 results)

All 2020 2019 Other

All Int'l Joint Research (12 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 2 results,  Open Access: 3 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Int'l Joint Research] INFN/Milano/Milan University/INFN/LNS(イタリア)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] IMP/CAS(中国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Seoul National University/Sungkyunkwan University/Ewha Womans University(韓国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] INFN/Milano/Milan University/INFN/LNS(イタリア)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] IMP/CAS(中国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Seoul National University/Sungkyunkwan Universty/Ewha Womans University(韓国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] INFN - Milano/Milan University/INFN - LNS(イタリア)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] IMP - CAS(中国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Seoul National University/Sungkyunkwan University/Ewha Womans University(韓国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] National Institute for Nuclear Physics(イタリア)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] 中国科学院近代物理研究所(中国)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] Institue for Basic Science(韓国)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Calibration and simulation of LaBr3:Ce scintillator for analyzing 8Li(α, n)11B-reaction data2020

    • Author(s)
      Y. Mizoi et al.
    • Journal Title

      RIKEN Accelerator Progress Report

      Volume: 53 Pages: 54-54

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] New measurement of 8Li(α,n) 11B reaction2020

    • Author(s)
      Y. Mizoi et al.
    • Journal Title

      Annual Report 2018, Center for Nuclear Study

      Volume: - Pages: 9-10

    • Related Report
      2020 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] New measurement of 8Li(α,n)11B reactions2019

    • Author(s)
      Y. Mizoi, et al.
    • Journal Title

      RIKEN Accelerator Progress Report

      Volume: 52 Pages: 58-58

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 天体核反応8Li(α,n)11B 反応断面積データの検証II2020

    • Author(s)
      溝井浩、他
    • Organizer
      日本物理学会 第75回年次大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 8Li(α,n)11B 反応の新しい測定結果と、そこから示唆される元素合成ネットワークへの影響2019

    • Author(s)
      溝井浩
    • 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
      2019 Research-status Report
    • Invited
  • [Presentation] 天体核反応8Li(α,n)11B 反応断面積データの検証2019

    • Author(s)
      溝井浩、他
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Measurement of excitation function with RI beam2019

    • Author(s)
      Y. Mizoi
    • Organizer
      RCNP AT-TPC workshop
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 天体核反応8Li(α,n)11Bの反応断面積データの検証2019

    • Author(s)
      溝井浩 他
    • Organizer
      日本物理学会
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2022-02-22  

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