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Overproduction of heavy elements in massive stars and(n,gamma)reaction

Research Project

Project/Area Number 19540296
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionOsaka University

Principal Investigator

NAGAI Yasuki  Osaka University, 核物理研究センター, 協同研究員 (80028240)

Co-Investigator(Kenkyū-buntansha) SHIMA Tatsushi  大阪大学, 核物理研究センター, 助教 (10222035)
大島 真澄  日本原子力研究開発機構, 原子力基礎工学研究部門, 研究主席 (40354815)
原田 秀郎  日本原子力研究開発機構, 原子力基礎工学研究部門, 研究主幹 (80421460)
瀬川 麻里子  日本原子力研究開発機構, 量子ビーム応用研究部門, 博士研究員 (00435603)
梶野 敏貴  東京国立天文台, 理論研究部, 助教授 (20169444)
Co-Investigator(Renkei-kenkyūsha) OSHIMA Mashumi  日本原子力研究開発機構, 原子力基礎工学研究部門, 研究主席 (40354815)
HARADA Hideo  日本原子力研究開発機構, 原子力基礎工学研究部門, 研究主幹 (80421460)
SEGAWA Mariko  日本原子力研究開発機構, 量子ビーム応用研究部門, 博士研究員 (00435603)
KAJINO Toshitaki  東京国立天文台, 理論研究部, 准教授 (20169444)
Project Period (FY) 2007 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2007: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords大質量星 / 重元素 / 過剰生成 / (n,γ)反応 / s-過程 / s過程元素合成 / 弱s過程模型 / 速中性子捕獲 / 超金属欠乏星 / 初期宇宙 / s-過程終端核 / r-過程元素合成 / keV中性子 / 金属欠乏星 / s-過程元素合成 / 中性子捕獲反応 / 恒星内温度 / 宇宙核時計 / 粒子・孔状態 / ベータ崩壊
Research Abstract

金属欠乏星でのs-過程元素合成に重要な影響を与える^<18>OのkeV中性子捕獲反応断面積の実験を通し、終核^<19>Oの第一励起状態への部分捕獲断面積が理論予測値の180倍もある事を明らかにした。この結果は元素合成の計算に標的核及び終核の核構造、ドアウエイ状態の存在が大きく影響する事を示しており今後の元素合成研究に大きな影響を持つ。又超金属欠乏星で観測される様になった鉛はs-過程元素合成終端核に位置し一方でr-過程による元素合成成分も含む。s-過程の寄与を調べるべく^<207>Pb共鳴状態及び^<208>PbのkeV中性子捕獲断面積測定を行い、世界で初めて即発不連続ガンマ線観測に成功した。

Report

(3 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • Research Products

    (26 results)

All 2009 2008 2007

All Journal Article (14 results) (of which Peer Reviewed: 8 results) Presentation (12 results)

  • [Journal Article] New constraints on radiative decay of long-lived particles in big bang nucleosynthesis with new He4 photodisintegration data2009

    • Author(s)
      M. Kusakabe, T. Kajino, T. Yoshida, T. Shima, Y. Nagai, T. Kii
    • Journal Title

      Phys.Rev.D 79

      Pages: 123513-123513

    • Related Report
      2008 Final Research Report
  • [Journal Article] Production of^<99>Mo for nuclear medicine by^<100>Mo(n, 2n)^<99> Mo2009

    • Author(s)
      Y. Nagai, Y. Hatsukawa
    • Journal Title

      Journal of the Physical Society of Japan 78

    • NAID

      110007138896

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Role of multiparticle-multihole states of ^<18,19>O in ^<18>O(n, gamma)^<19>O reactions at keV energy2008

    • Author(s)
      T. Ohsaki, M. Igashira, Y. Nagai, M. Segawa, K. Muto
    • Journal Title

      Phys.Rev.C 77

    • Related Report
      2008 Final Research Report
  • [Journal Article] Improvement of thickness and uniformity of isotopically enriched 12C targets on backings by the HIVIPP method2008

    • Author(s)
      I. Sugai, Y. Nagai, et al.
    • Journal Title

      Nucl.Instr.Meth.A 590

    • Related Report
      2008 Final Research Report
  • [Journal Article] Role of multiparticle-multihole states of^<18, 19>O in^<18>O(n, γ)^<19>O reactions at keV energy2008

    • Author(s)
      T. Ohsaki, Y. Nagai, et al.
    • Journal Title

      Physical Review C77

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Neutron capture and inelastic scattering cross sections for^<186> 0s, ^<187>Os, and^<189>Os and the Re-Os chronology2008

    • Author(s)
      M. Segawa, Y. Nagai, et al.
    • Journal Title

      AIP Conference Proceedings 1016

      Pages: 448-450

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Measurement of the half-life of^<60>Fe for a Nearby Supernova Source2008

    • Author(s)
      K. Takahisa, Y. Nagai, et al.
    • Journal Title

      AIP Conference Proceedings 1016

      Pages: 463-465

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] E1 and E2 cross sections of the^<12>C(α, γ)^<16>O reaction at E_<cm>~14 Mev using pulsed α beams2008

    • Author(s)
      H. Makii, Y. Nagai, et al.
    • Journal Title

      AIP Conference Proceedings 1016

      Pages: 215-220

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Neutron capture cross sections of ^<186>Os, ^<187>Os, and ^<189>Os for the Re-Os chronology2007

    • Author(s)
      M. Segawa, Y. Nagai, T. Shima, etal.
    • Journal Title

      Phys.Rev.C 76

    • Related Report
      2008 Final Research Report
  • [Journal Article] Neutron-induced reactions using a γ-ray detector in a 12C(α, γ)^<16>O reaction study2007

    • Author(s)
      H. Makii, Y. Nagai, K. Mishima, M. Segawa, T. Shima, M. Igashira
    • Journal Title

      Phys.Rev.C 76

    • Related Report
      2008 Final Research Report
  • [Journal Article] Role of multiparticle-multihole states in ^<18,19>O in thermal neutron capture of ^<18>O2007

    • Author(s)
      Y. Nagai, M. Segawa, et al.
    • Journal Title

      Phys.Rev.C 76

    • Related Report
      2008 Final Research Report
  • [Journal Article] Neutron capture cross sections of 186Os,187Os,and 189Os for the Re-Os chronology2007

    • Author(s)
      M. Segawa, Y. Nagai, et. al.
    • Journal Title

      Physical Review C76

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Neutron-induced reactions using a γ -ray detector in a 12C(α,γ)16O reaction study2007

    • Author(s)
      H. Makii, Y. Nagai, et. al.
    • Journal Title

      Physical Review C76

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Role of multiparticle-multihole states in 18,19O in thermal neutron capture of 18O2007

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

      Physical Review C76

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Presentation] 恒星内He燃焼と(^<12>C)+(^4He)核融合反応2009

    • Author(s)
      永井泰樹
    • Organizer
      分野融合型研究会「天体観測、隕石分析、天体核物理学による同位体組成と元素の起源の研究」
    • Place of Presentation
      国立天文台(三鷹市)
    • Year and Date
      2009-02-24
    • Related Report
      2008 Annual Research Report
  • [Presentation] Role of multiparticle-multihole states of^18, 19O in ^18O(n, γ)^19 O at stellar temperatures2008

    • Author(s)
      Y. Nagai
    • Organizer
      SARAF Workshop 2008
    • Place of Presentation
      イスラエル
    • Year and Date
      2008-10-27
    • Related Report
      2008 Annual Research Report
  • [Presentation] Deuteron and ^4He photodisintegrations at low energies2008

    • Author(s)
      Y. Nagai
    • Organizer
      Soft Photons & Light Nuclei Workshop
    • Place of Presentation
      シアトル
    • Year and Date
      2008-06-18
    • Related Report
      2008 Annual Research Report
  • [Presentation] 超新星爆発に関わる軽核の光核反応2008

    • Author(s)
      嶋 達志
    • Organizer
      光隕石ワークショップ
    • Place of Presentation
      日本原子力研究開発機構光科学研究所(木津)
    • Year and Date
      2008-02-21
    • Related Report
      2007 Annual Research Report
  • [Presentation] 天体核物理研究で学ぶ核物理2008

    • Author(s)
      永井泰樹
    • Organizer
      光隕石ワークショップ
    • Place of Presentation
      日本原子力研究開発機構光科学研究所(木津)
    • Year and Date
      2008-02-21
    • Related Report
      2007 Annual Research Report
  • [Presentation] Deuteron and ^4He Photodisintegrations at Low Energies2008

    • Author(s)
      Y. Nagai
    • Organizer
      International Symposium on Soft Photons and Light Nuclei
    • Place of Presentation
      Seattle, USA
    • Related Report
      2008 Final Research Report
  • [Presentation] Role of multi-particle multi-hole states of ^<18,19>O in ^<18>O(n, γ)^<19>O at stellar temperatures2008

    • Author(s)
      Y. Nagai
    • Organizer
      SARAF workshop
    • Place of Presentation
      Israel
    • Related Report
      2008 Final Research Report
  • [Presentation] Study of photonuclear reactions relevant for astrophysical nucleosynthesis with NewSubaru Laser-Compton-Scattered Gamma-ray beam2007

    • Author(s)
      T. Shima, et. al.
    • Organizer
      第10回国際シンポジウム:物質の起源と銀河の進化
    • Place of Presentation
      北海道大学
    • Year and Date
      2007-12-05
    • Related Report
      2007 Annual Research Report
  • [Presentation] E1 and E2 cross sections of the 12C (He, gamma)16O reaction at Ec.m.=1.4 MeV using pulsed He beams2007

    • Author(s)
      H. Makii, Y. Nagai, et. al.
    • Organizer
      第10回国際シンポジウム:物質の起源と銀河の進化
    • Place of Presentation
      北海道大学
    • Year and Date
      2007-12-05
    • Related Report
      2007 Annual Research Report
  • [Presentation] Neutron capture and inelastic scattering cross sections for 186Os,187Os,and 189Os and the Re-Os chronology2007

    • Author(s)
      M. Segawa, Y. Nagai, et. al.
    • Organizer
      第10回国際シンポジウム:物質の起源と銀河の進化
    • Place of Presentation
      北海道大学
    • Year and Date
      2007-12-05
    • Related Report
      2007 Annual Research Report
  • [Presentation] Alpha and neutron radiative capture reactions2007

    • Author(s)
      永井泰樹
    • Organizer
      日本物理学会秋の分科会
    • Place of Presentation
      北海道大学
    • Year and Date
      2007-09-21
    • Related Report
      2007 Annual Research Report
  • [Presentation] Probing nuclear properties by prompt gamma-ray detection2007

    • Author(s)
      Y. Nagai, et. al.
    • Organizer
      第12回国際会議:放射化分析の最新の傾向
    • Place of Presentation
      首都大学東京
    • Year and Date
      2007-09-18
    • Related Report
      2007 Annual Research Report

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Published: 2007-04-01   Modified: 2025-11-18  

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