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Determination of astrophysical rates for reaction involving light unstable nuclei relevant to nucleosynthesis in novae and super novae

Research Project

Project/Area Number 15204025
Research Category

Grant-in-Aid for Scientific Research (A)

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

Principal Investigator

MOTOBAYASHI Tohru  RIKEN, Heavy-Ion Nuclear Physics Laboratory, Chief Scientist, 本林重イオン核物理研究室, 主任研究員 (20116114)

Co-Investigator(Kenkyū-buntansha) ICHIHARA Takashi  RIKEN, RI Physics Laboratory, Vice Chief Scientist, 櫻井RI物理研究室, 副主任研究員 (60176302)
KISHIDA Takashi  RIKEN, RI Physics Laboratory, Senior Research Scientist, 櫻井RI物理研究室, 先任研究員 (20204852)
AOI Nori  RIKEN, Heavy-Ion Nuclear Physics Laboratory, Research scientist, 本林重イオン核物理研究室, 研究員 (00311647)
YANAGISAWA Yoshiyuki  RIKEN, Heavy-Ion Nuclear Physics Laboratory, Research scientist, 本林重イオン核物理研究室, 研究員 (70360659)
TAKEUCHI Satoshi  RIKEN, Heavy-Ion Nuclear Physics Laboratory, Special Postdoctoral Researcher, 本林重イオン核物理研究室, 基礎科学特別研究員 (30360580)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥49,140,000 (Direct Cost: ¥37,800,000、Indirect Cost: ¥11,340,000)
Fiscal Year 2005: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2004: ¥23,530,000 (Direct Cost: ¥18,100,000、Indirect Cost: ¥5,430,000)
Fiscal Year 2003: ¥19,890,000 (Direct Cost: ¥15,300,000、Indirect Cost: ¥4,590,000)
KeywordsCoulomb dissociation / rp process / explosive hydrogen burning / RI beam / magnetic dipole transition / proton capture reaction / positron decay / nova / 結晶軸 / 高速増幅器 / 核力励起 / クーロン分解反応 / 不安定核ビーム / 2陽子捕獲反応 / ストリップ型シリコン検出器 / 結晶チャネリング / 放射捕獲反応 / CNOサイクル
Research Abstract

Experimental results with fast RI beams provided by the RIKEN accelerator facility have been analyzed, and considerations for future studies were made.
1) Proton capture reactions in the rp process studied by the Coulomb dissociation method
Based on the experimental results of the Coulomb dissociation experiments with ^<23>Al and ^<27>P beams, astrophysical reaction rates for explosive hydrogen burning processes have been determined. The critical condition in the temperature and density where the proton capture becomes faster than the positron decay was obtained. In comparison with astrophysical models for novae and X-ray bursts, it turned out that positron decays dominate in novae whereas proton capture is important in X-ray bursts.
2) Reaction mechanism study on Coulomb dissociation
Experiments of ^8B breakup have been performed with liquid hydrogen and helium targets in addition to a lead target, in order to extract the amount of M1, E2 and nuclear excitation components. Their results a … More re necessary to accurately extract the proton capture cross section from Coulomb dissociation. Extracted elastic scattering angular distributions were analyzed with the optical potential model. Especially, the data for the lead target were well reproduced by the potential used in the previous calculation, confirming the earlier analysis. Through discussions with theorists, existing difference between the results from the direct and Coulomb dissociation experiments may be understood by the effect of multi step processes by microscopic reaction calculations.
3) Development of the method to extract M1 transition probability
In many reactions involved in explosive hydrogen burning, transitions with mixture of M1 and E2 components are important. Possibility of resolving the Ml component from dominant E2 in Coulomb dissociation data with precise angular distribution measurements has been considered. Based on a simulation calculation, its usefulness was examined and a new experiment has been proposed and approved at RIKEN. Less

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (15 results)

All 2006 2005 2004 Other

All Journal Article (13 results) Publications (2 results)

  • [Journal Article] Low-energy cross section of the ^7Be(p, γ )^8B solar fusion reaction from the Coulomb dissociation of ^8B2006

    • Author(s)
      F.Shumann 他
    • Journal Title

      Physical Review C73

      Pages: 15806-15806

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Study of the ^<26>Si(p, γ )^<27>P reaction through Coulumb dissociation of ^<27>P2006

    • Author(s)
      Y.Togano 他
    • Journal Title

      European Physical Journal A27

      Pages: 233-236

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Low-energy cross section of the ^7Be(p, γ)^8B solar fusion reaction from the Coulomb dissociation of ^8B2006

    • Author(s)
      F.Shumann, et al.
    • Journal Title

      Physical Review C73

      Pages: 15806-15806

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Study of the^<26>Si (p, γ)^<27>P reaction through Coulumb dissociation of ^<27>P2006

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

      European Physical Journal A27

      Pages: 233-236

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Low-energy cross section of the ^7Be(p,γ)^8B solar fusion reaction from the Coulomb dissociation of ^8B2006

    • Author(s)
      F.Schumann 他
    • Journal Title

      Physical Review C73

      Pages: 15806-15806

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Liquid hydrogen and helium targets for radioisotope beams at RIKEN2005

    • Author(s)
      H.Ryuto 他
    • Journal Title

      Nuclear Instruments and Methods A555

      Pages: 1-5

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Coulomb Dissociation of ^<23>Al for the stellar ^<22>Mg(p, γ )^<23>Al reaction2005

    • Author(s)
      T.Gomi 他
    • Journal Title

      Nuclear Physics A758

      Pages: 761-761

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Liquid hydrogen and helium targets for radioisotope beams at RIKEN2005

    • Author(s)
      H.Ryuto, et al.
    • Journal Title

      Nuclear Instruments and Methods A555

      Pages: 1-5

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Coulomb Dissociation of ^<23>Al for the stellar ^<22>Mg (p,γ)23Al reaction2005

    • Author(s)
      T.Gomi, et al.
    • Journal Title

      Nuclear Physics A758

      Pages: 761-761

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Coulomb Dissociation of ^<23>Al for the stellar ^<22>Mg (p,γ)^<23>Al reaction2005

    • Author(s)
      T.Gomi 他
    • Journal Title

      Nuclear Physics A758

      Pages: 761-761

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Study of the stellar ^<22>Mg(p,g)^<23>Al reaction using the Coulomb-dissociation method2004

    • Author(s)
      T.Gomi, T.Motobayashi et al.
    • Journal Title

      Nuclear Physics A 734

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Indirect measurements of astrophysical cross sections with radioactive isotope beams2004

    • Author(s)
      T.Motobayashi
    • Journal Title

      Nuclear Physics A 734

      Pages: 623-623

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Recent studies with fast RI beams of interest in nuclear structure and astrophysics2004

    • Author(s)
      T.Motobayashi
    • Journal Title

      Nuclear Physics A 738

      Pages: 155-155

    • Related Report
      2004 Annual Research Report
  • [Publications] T.Gomi, T.Motobayashi et al.: "Study of the ^<22>Mg(p,γ)^<23> Al Reaction with the Coulomb-Dissociation Method"Nuclear Physics A. 718. 508-509 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Yamada, T.Motobayashi et al.: "E1 strength of the subthreshold 3/2^+ stat in ^<15>O studied by Coulomb excitation"Physics Letters B. 579. 265-270 (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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