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E1/E2 Ratio of ^<12>C(α, γ)^<16>O Reaction in Energy Regin of Astrophysical Interest

Research Project

Project/Area Number 10440077
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

MORINOBU Shunpei  Kyushu University, Faculty of Sciences, Professor, 大学院・理学研究院, 教授 (50016078)

Co-Investigator(Kenkyū-buntansha) IKEDA Nobuo  Kyushu University, Faculty of Sciences, Research Associate, 大学院・理学研究院, 助手 (70193208)
SUGIMITS Tshuyosi  Kyushu University, Faculty of Sciences, Associate Professor, 大学院・理学研究院, 助教授 (70037216)
SAGARA Kensi  Kyushu University, Faculty of Sciences, Associate Professor, 大学院・理学研究院, 助教授 (00128026)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥12,800,000 (Direct Cost: ¥12,800,000)
Fiscal Year 2000: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1999: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1998: ¥6,200,000 (Direct Cost: ¥6,200,000)
KeywordsNuclear astrophysics / He-burning / ^<12>C+γ / Recoil mass-analysis / γ-ray angular distribution / Accelerator development
Research Abstract

Although the rate of the α-capture reaction, ^<12>C+α→^<16>O+γ, is of crucial importance in the scenario of evolution of main sequence stars, the experimental determination has long been hampered by great technical difficulties arising from extremely low cross section. The aim of the present investigation was to facilitate the rate measurement by detecting ^<16>O ions from the inverse kinematics reaction ^<12>C(^4He, ^<16>O) γ and to determine the E1/E2-capture ratio from the γ-ray angular distribution extracted from the analysis of the ^<16>O energy spectrum. In order to overcome the experimental difficulty, many technical developments were carried out both in the tandem accelerator and in the measuring system.
1.Developments of the tandem accelerator
To cope with very small cross section, the accelerator developments were carried out to make high-current beams with good quality available. A new acceleration mode of strong focusing principle was developed and a large aperture gas charge … More -stripper was installed. These altogether achieved 1000 times increase in the low energy ^<12>C beam intensity and 2-5 times improvement in the beam emittance. Beam pulsing was also made available by a newly developed buncher-chopper system.
2.Development of the measuring system
In order to separate ^<16>O ions from the high flux of beam particles, a new recoil separator was constructed and established as an excellent tool for the measurement by the detailed ion-optical investigation. A newly developed ^4He gas target was also installed. The method of measuring γ-ray angular distribution from the particle energy spectrum was examined using the ^<16>O (^<13>C, ^<12>C[2+])^<17>O and ^<16>O (^<ll>B, ^<12>C[2+] )^<15>N reactions and was found to work quite effectively in attaining the aim of the measurement.
3.Test measurement and experiment
The test measurements were carried out and it was observed that three kinds of backgrounds were present in the particle spectrum. The origins were identified and two of them were successfully eliminated. To remove the last one, the beam line is being remodeled. The measurement has been started at a high energy of E_<cm>=2.4MeV, where the yield is expected relatively high. The energy of the measurement will be gradually reduced along with the repetition of test and improvement as above. Less

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (59 results)

All Other

All Publications (59 results)

  • [Publications] K.Sagara: "A Plan for ^4He(^<12>C, ^<16>O)g Experiment"Proc.Tours Sympo.on Nuclear Physics III, Tours AIP Conference Proceedings. 425・. 337-342 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sagara: "Accel-Decel Strong Focusing Method for a Tandem Accelerator"Proc.12th Sympo.on Accelerator Science and Technology. 63-65 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sagara: "Testa of Accel-Decel Strong focusing method at Kyushu University Accelerator and Experiments of Nuclear Astrophysics"Proc.12th Sympo.on Tandem Accelerator and Related Techniues. 121-124 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Measurements of Radiative Capture Reaction by Recoil Detection in Inverse Kinematics"Few-Body Systems Suppl.. 12. 98-10 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Tensor polarization of ^<12>C[2+^1] in the ^<16>O(^<13>C, ^<12>C)^<17>O Reaction at 50 MeV"Eur.Phys.J.. A7. 491-502 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Role of Multi-Step Processes in ^<16>O(^<11>B, ^<12>C)^<15>N at 41.25 MeV"Eur.Phys.J.. A9. 213-213 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Role of Multi-Step Processes in ^<16>O(^<11>B, ^<12>C)^<15>N at 41.25 MeV"Kyushu University Tandem Accelerator Report, KUTL-7. 7. 32-34 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Tensor polarization of ^<12>C[2+^1] in the ^<16>O(^<13>C, ^<12>C)^<17>O Reaction at 50 MeV"Kyushu University Tandem Accelerator Report, KUTL-7. 7. 35-36 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Tsuruta: "Preparation for ^4He(^<12>C, ^<16>O)γ Experiment"Kyushu University Tandem Accelerator Report, KUTL-7. 7. 97-101 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Tsuruta: "Construction of Recoil Mass Separator"Kyushu University Tandem Accelerator Report, KUTL-7. 7. 102-103 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Noda: "Commissioning of Recoil Mass Separator at Kyushu University Tandem Accelerator Laboratory"Kyushu University Tendem Accelerator Report, KUTL-7. 7. 104-108 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Nakamura: "Development of a Blow-in Type Gas Stripper Having a Large Aperture"Kyushu University Tandem Accelerator Report, KUTL-7. 7. 143-145 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sagara: "Accel-Decel Strong Focus for a Tandem Accelerator"Kyushu University Tandem Accelerator Report, KUTL-7. 7. 146-150 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Tsubusaki: "Test of Beam Bunching System"Kyushu University Tendem Accelerator Report, KUTL-7. 7. 151-154 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Tugimitsu: "Development of a Negative-Ion Plasma Sputter Source of the BLAKE-V Type"Kyushu University Tandem Accelerator Report, KUTL-7. 7. 155-157 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Morinobu: "A Trial to Measure ^<12>C+^4He→^<16>O Reaction Rate of Astrophysical Interest in Kyushu University"Proc.CNS/RIKEN Sympo.on Physics of Low Energy RIB. (in press). - (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sagara: "Development of Beam, Target and Analyzer for Astro-Nuclear Experiment"Proc.Memorial Sympo.of 25th Anniversary of Tsukuba Univ.Accelerator Center. (in press). - (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sagara: "A Plan for ^4He (^<12>C, ^<16>O) γ Experiment"Proc.Tours Sympo.on Nuclear Phuys III, Tours AIP Conf.Proc.. 425. 337-342 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sagara: "Accel-Decel Strong Focusing Method for a Tandem Accelerator"Proc.12th Sympo.on Accelerator Science and Technology. 63-65 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sagara: "Test of Accel-Decel Strong focusing method at Kyushu University Tandem Accelerator and Experiments of Nuclear Astrophysics"Proc.12th Sympo.on Tandem Accelerator and Related Techniques. 121-124 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Measurements of Radiative Capture Reaction by Recoil Detection in Inverse Kinematics"Few-Body Systems Suppl.. 12. 98-101 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Tensor polarization of ^<12>C[2+_1] in the ^<16>O(^<13>C, ^<12>)^<17> Reaction at 50 MeV"Eur.Phys.J.. A7. 491-502 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Role of Multi-Step Processes in ^<16>O(^<11>B, ^<12>C)^<15>N at 41.25 MeV"Eur.Phys.J.. A9. 213-220 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Role of Multi-Step Processes in ^<16>O(^<11>B, ^<12>C)^<15>N at 41.25 MeV"Kyushu Univ.Tandem Accelerator Report. KUTL-7. 32-34 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Tensor polarization of ^<12>C[2+_1] in the ^<16>O(^<13>C, ^<12>C)^<17>O Reaction at 50 MeV"Kyushu Univ.Tandem Accelerator Report. KUTL-7. 35-36 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Tsuruta: "Preparation for ^4He(^<12>C, ^<16>C)γ Experiment"Kyushu Univ.Tandem Accelerator Report. KUTL-7. 97-101 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Tsuruta: "Construction of Recoil Mass Separator"Kyushu Univ.Tandem Accelerator Report. KUTL-7. 102-103 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Noda: "Commissioning of Recoil Mass Separator at Kyushu University Tandem Accelerator Laboratory"Kyushu Univ.Tandem Accelerator Report. KUTL-7. 104-108 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Nakamura: "Development of a Blow-in Type Gas Stripper Having a Large Aperture"Kyushu Univ.Tandem Accelerator Report. KUTL-7. 143-145 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sagara: "Accel-Decel Strong Focus for a Tandem Accelerator"Kyushu Univ.Tandem Accelerator Report. KUTL-7. 146-150 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Tsubusaki: "Test of Beam Bunching System"Kyushu Univ.Tandem Accelerator Report. KUTL-7. 151-154 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sugimitsu: "Development of a Negative-Ion Plasma Sputter Source of the BLAKE-V Type"Kyushu Univ.Tandem Accelerator Report. KUTL-7. 155-157 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Morinobu: "A Trial to Measure ^<12>+^4He→^<16>O Reaction Rate of Astrophysical Interest in Kyushu University"Proc.CNS/RIKEN Sympo.on Physics of Low Energy RIB. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Sagara et al.: "Development of Beam, Target and Analyzer for Astro-Nuclear Experiment"Proc.Memorial Sympo.of 25th Anniversary ot Tsukuba Univ.Accelerator Center. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Ikeda: "Measurements of Radiative Capture Reaction by Recoil Detection in Inverse Kinematics"Few-Body Systems Suppl.. 12・. 98-101 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Ikeda: "Tensor polarization of ^<12>C [2+1] in the ^<16>O (^<13>C, ^<12>C) ^<17>O Reaction at 50 MeV"The European Physsical Journal A. 7・. 491-502 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Ikeda: "Role of Multi-Step Processes in ^<16>O (^<11>B, ^<12>C) ^<15>N at 41.25 MeV"The European Physsical Journal A. 9・. 213-220 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Turuta: "Preparation for ^4He (^<12>C, ^<16>O) γ Experiment"Kyushu University Tandem Accelerator Report, KUTL-7. 7・. 97-101 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Turuta: "Construction of Recoil Mass Separator"Kyushu University Tandem Accelerator Report, KUTL-7. 7・. 102-103 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Noda: "Commissioning of Recoil Mass Separator at Kyushu University Tandem Accelerator Laboratory"Kyushu University Tandem Accelerator Report, KUTL-7. 7・. 104-108 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Nakamura: "Development of a Blow-in Type Gas Stripper Having a Large Aperture"Kyushu University Tandem Accelerator Report, KUTL-7. 7・. 143-145 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Sagara: "Accel-Decel Strong Focus for a Tandem Accelerator"Kyushu University Tandem Accelerator Report, KUTL-7. 7・. 146-145 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Sugimitsu: "Development of a Negative-Ion Per Source of the Blake-V Type"Kyushu University Tandem Accelerator Report, KUTL-7. 7・. 155-157 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Morinobu: "A Trial to Measure ^<12>C+^4He→^<16>O Reaction Rate of Astrophysical Interest in Kyushu University"Proc.CNS/RIKEN Sympo.on Physics of Low Energy RIB. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Sagara: "Development of Beam, Target and Analyzer for Astro-Nuclear Experiment"筑波大学加速器センター25周年記念シンポジウム報告,. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 中島孝夫: "強集束タンデム加速器"第11回タンデム加速器及びその周辺技術の研究報告集. 50-55 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K. Sagara: "Accel-Decel Strong Focusing Metmod for a Tandem Accelerator"Proc. 12th Symposium on Accelerator Science and Technology. 63-65 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 相良建至: "九大タンデムでの加速減速強収束テストと天体核反応実験"第12回タンデム加速器及びその周辺技術の研究報告集. 121-124 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] N. Ikeda: "Measurements of Radiative Capture Reaction by Recoil Detection in Inverse Kinematics"Few-Body Systems Supplement. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] K. Sagara: "Accel-decel strong focusing for tandem accelerator"Proc. 4th Korea-Japan Joint Symposium, Soul, 1999. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] N. Ikeda: "Tensor polarization of ^<12>C[2+] in the ^<16>O(^<13>C, ^<12>C)^<17>O reaction at 50 MeV"Eur. Phys. J. A. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] A.M.E1-Badry: "Recoil distance half-life measurements of the excited states in ^<145>Sm" Eur.Phys.J.A.3・2. 133-138 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.De Leo: "Low-lying stats of ^<56>Fe" Phys.Rev.C. 57・4. 1604-1616 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Noro: "A study of nucleon properties in nuclei through(p,2p)reaction" Nucl.Phys.A. 629・1-2. 324-333 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Nishimori: "Precise experiment on n+d scattering at 12 Mev" Nucl.Phys.A. 631. 697-700 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Sagara: "A plan for ^4He(^<12>C,^<16>O)γ reaction" AIP Conference Proceedings. 425. 337-342 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Sagara: "Windowless gas teget for nuclear astrophysics" Proceedings fo International Workshop on JHF 98-5. 300-303 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] G.Guimaraes: "Nuclear structure of ^<17>Ne by the three-neutron pick-up(^3He,^6He) reaction" Phys.Rev.C. 58・1. 116-126 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Kouda: "A new method of accurate polarization measurement on isobaric analog resonance to detect non-conservation" Nucl.Instr.and Meth.A. 420. 380-391 (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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