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Direct measurement of Nuclear Fusion Cross Section at Stars.

Research Project

Project/Area Number 15104004
Research Category

Grant-in-Aid for Scientific Research (S)

Allocation TypeSingle-year Grants
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionKyushu University

Principal Investigator

SAGARA Kenshi  Kyushu University, Department of Physics, Professor (00128026)

Co-Investigator(Kenkyū-buntansha) NORO Tetsuo  Kyushu University, Dept. of Physics, Associate Professor (30164750)
MORIKAWA Tsuneyasu  Kyushu University, Dept. of Physics, Group Leader (00274423)
IKEDA Nobuo  Kyushu University, Dept. of Engineering, Assistant Professor (70193208)
WAKASA Tomotsugu  Kyushu University, Dept. of Physics, Associate Professor (10311771)
TERANISHI Takashi  Kyushu University, Dept. of Physics, Assistant Professor (10323495)
HASHIMOTO Masaaki  Kyushu University, Dept. of Physics, Assistant Professor (20228422)
御手洗 志郎  九州大学, 理学研究院, 助教授 (00108648)
Project Period (FY) 2003 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥114,790,000 (Direct Cost: ¥88,300,000、Indirect Cost: ¥26,490,000)
Fiscal Year 2007: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2006: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
Fiscal Year 2005: ¥31,200,000 (Direct Cost: ¥24,000,000、Indirect Cost: ¥7,200,000)
Fiscal Year 2004: ¥30,810,000 (Direct Cost: ¥23,700,000、Indirect Cost: ¥7,110,000)
Fiscal Year 2003: ¥37,570,000 (Direct Cost: ¥28,900,000、Indirect Cost: ¥8,670,000)
KeywordsHelium burning in stars / Thermal nuclear fusion in stars / evolution of star / very low background experiment / tandem accelerator / beam pulsation / windowless gas target / 窓なし気体標的冷却 / 天体熱核融合反応 / 長時間チョッパー / 加速器改造 / ヘリウム燃焼 / 直接測定
Research Abstract

Cross section of ^<12>C+^4He->^<16>O+γ reaction at Ecm = 0.3 MeV plays a crucial role in nuclear synthesis in stars, and measurements of the cross section have been attempted for about 40 years in the world However, the cross section has not measured yet since the experiment is extremely difficult. We have prepared the measurement of ^<12>C+^4He->^<16>O+γ reaction cross section at Kyushu University tandem laboratory for 15 years. In our method, we detect ^<16>O from inverse kinematics 12C+4He >16O+γ reaction at Ecm = 2.4 -0.7 MeV, and extrapolate the cross section down to 0.3 MeV. This is only one method to arrive the goal, but there are many difficulties. In 2004, we first succeeded in detecting ^<16>O from ^<12>C+^4He->^<16>O+γ reaction at Ecm = 2.4 MeV, although absolute value of the cross section could not be obtained.
To arrive the goal, we need a)C beam intensity of more than 5 μA, b)He windowless target of 25 Torr x 3cm, c)background(BG)level below 10^<-19>, d)pulsed beam, e)stab … More le RF power supply of 2-6 MHz, f)optimized slit system of a recoil mass separator, and g)extrapolation method. Already we have pulsed the beam. BG level is now 10^<-17>, and remaining BG is to be found below Ecm = 1.2 MeV. In 2007, progress was made in a), b), and e)-g). We succeeded in preparing a He windowless target of 25 Torr x 3cm. The windowless target is 5 times thicker than those in the past. For a) and e)-g), we made concrete plan and 60-80% have been finished in 2007.
In 2007, we made system check by measuring ^<12>C+^4He->^<16>O+γ cross section at 2.4 MeV, and found new BG produced by scattering of secondary beam halo at fixed slit in the recoil mass separator. By this trouble, experiment at 1.5 MeV was postponed to 2008. At Ruhr University, Germany, ^<12>C+^4He>^<16>O+y cross section has been measured at Ecm = 5.0-1.9 MeV. Owing to the preparation made in this research project, grant-in-aid, we will be able to make the ^<12>C+^4He->^<16>O+y experiment at Ecm= 1.5-0.7 MeV in 2008-2011, and arrive at the goal. Less

Report

(6 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (45 results)

All 2008 2007 2006 2005 2004 2003 Other

All Journal Article (34 results) (of which Peer Reviewed: 2 results) Presentation (8 results) Publications (3 results)

  • [Journal Article] Measurement of ^<12>C+^4He → ^<16>O+γ cross section at Ecm = 2.4 MeV2007

    • Author(s)
      H., oba, K, Sagara, et. al.
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10

      Pages: 49-52

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Angular acceptance of RMS for ^<12>C+^4He → ^<16>O+γ experiment2007

    • Author(s)
      H., oba, K., Sagara, et. al.
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10

      Pages: 95-97

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Pre-bunching system for high-efficiency pulsed beam2007

    • Author(s)
      K., Sagara, et. al.
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10

      Pages: 98-101

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Use of a very thin SiNx foil for a gas target window2007

    • Author(s)
      S., Kamibeppu, et. al.
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10

      Pages: 102-104

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Cooling of a windowless gas target2007

    • Author(s)
      S., kamibeppu, et. al.
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10

      Pages: 105-109

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Charge state distribution of ^<16>O through Carbon foil and Argon gas2007

    • Author(s)
      K., Nihsida, et. al.
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10

      Pages: 110-114

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Present status and strategy of^4He(^<12>C, ^<16>O)γ experiment2007

    • Author(s)
      K.Sagas and T.Teranishi
    • Journal Title

      Kyushu University Tandem Accelerator Lab.Report 10

      Pages: 45-48

    • Related Report
      2007 Annual Research Report
  • [Journal Article] Measurement of^<l2>C+^4He→160+γ cross section at Ecm=2.4 MeV2007

    • Author(s)
      H.Oba, K.Sagara, 他6名
    • Journal Title

      Kyushu University Tandem Accelerator Lab.Report 10

      Pages: 49-52

    • Related Report
      2007 Annual Research Report
  • [Journal Article] Pre-bunching system for high efficiency pulsed beam2007

    • Author(s)
      K, Sagara, 他9名
    • Journal Title

      Kyushu University Tandem Accelerator Lab.Report 10

      Pages: 98-101

    • Related Report
      2007 Annual Research Report
  • [Journal Article] Use of a very thin SiNx foil for a gas target window2007

    • Author(s)
      S.Kamibeppu, K.Sagara, 他3名
    • Journal Title

      Kyushu University Tandem Accelerator Lab.Report 10

      Pages: 102-104

    • Related Report
      2007 Annual Research Report
  • [Journal Article] Cooling of a windowless gas target2007

    • Author(s)
      S.Kamibeppu, K.Sagara, 他4名
    • Journal Title

      Kyushu University Tandem Accelerator Lab.Report 10

      Pages: 105-109

    • Related Report
      2007 Annual Research Report
  • [Journal Article] Present Status and Strategy for ^4He(^<12>C,^<16>O)γ experiment at KUTL2007

    • Author(s)
      K.Sagara, T.Teranishi
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10

      Pages: 4-4

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Measurement of^4He(^<12>C,^<16>O)γ reaction cross section at E_<cm> = 2.4 MeV2007

    • Author(s)
      H.Oba, K.Sagara 他9名
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10

      Pages: 4-4

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Measurement of acceptance of the recoil mass separator and design of large-bore Q magnets2007

    • Author(s)
      H.Oba, K.Sagara 他9名
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10

      Pages: 4-4

    • Related Report
      2006 Annual Research Report
  • [Journal Article] A control system for beam bunchers and choppers2007

    • Author(s)
      K.Sagara, T.Maeda, 他5名
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10

      Pages: 3-3

    • Related Report
      2006 Annual Research Report
  • [Journal Article] アルミパイプ4本で大型タンデムを小型タンデムに変える2006

    • Author(s)
      相良 建至
    • Journal Title

      加速器 Vol.3,No.2

      Pages: 192-195

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary 2006 Annual Research Report
  • [Journal Article] Transform of a large tandem accelerator into a small one with four aluminum pipes2006

    • Author(s)
      K., Sagara
    • Journal Title

      Accelerator 3 #2

      Pages: 192-195

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Direct Measurement of ^4He(^<12>C,^<16>O)γ Reaction at Stellar Energy2006

    • Author(s)
      K.Sagara 他10名
    • Journal Title

      Proceedings of 6~<th> China-Japan Joint nuclear Physics Symposium (AIP Conference proceedings 865) 865

      Pages: 225-230

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Charge state distribution of ^<16>O through carbon and argon2006

    • Author(s)
      K.Nishida, K.Sagara 他10名
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10(掲載予定)

      Pages: 4-4

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Development of a pre-buncher for high-efficiency beam pulsing2006

    • Author(s)
      S.Kouzuma, K.Sagara 他11名
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10(掲載予定)

      Pages: 4-4

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Use of a thin SiNx foil for a gas target2006

    • Author(s)
      S.Kamibeppu, K.Sagara 他10名
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10(掲載予定)

      Pages: 2-2

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Design of a cooled windowless gas target2006

    • Author(s)
      S.Kamibeppu, K.Sagara 他10名
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 10(掲載予定)

      Pages: 4-4

    • Related Report
      2005 Annual Research Report
  • [Journal Article] A long-time chopper for direct measurement of 4_He(12_C,16_O)γ reaction crosssection2005

    • Author(s)
      H.Oba, K Sagara, 他4名
    • Journal Title

      Nuclear Physics A758

      Pages: 407-410

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Direct measurement of 4_He(12_C,16_O)γ reactionaround E_<cm>=2.4MeV at KUTL2005

    • Author(s)
      K.Sagara, 他7名
    • Journal Title

      Nuclear Physics A758

      Pages: 427-430

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] A long-time chopper for direct measurement of 4He(^<12>C, ^<16>O)γ reaction cross section2005

    • Author(s)
      H., Oba, K., sagara, et. al.
    • Journal Title

      Nuclear Physics A758

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Direct measurement of 4He(^<12>C, ^<16>O)γ, reaction around Ecm = 2.4 MeV at KUTL2005

    • Author(s)
      K., Sagara, et. al.
    • Journal Title

      Nuclear Physics A758

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Direct measurement of ^4He(^<12>C,^<16>O)γ reaction cross section around E_<cm>=2.4MeV at KUTL2005

    • Author(s)
      K.Sagara他7名
    • Journal Title

      Nuclear Physics A 258

      Pages: 427-430

    • Related Report
      2005 Annual Research Report
  • [Journal Article] A long-time chopper for direct measurement of ^4He(^<12>C,^<16>O)γ reaction2005

    • Author(s)
      H.Oba, K.Sagara 他4名
    • Journal Title

      Nuclear Physics A 258

      Pages: 407-410

    • Related Report
      2005 Annual Research Report
  • [Journal Article] A long-time chopper for direct measurement of ^4He(^<12>C,^<16>O)γ reaction2005

    • Author(s)
      H.Oba, K.Sagara 他4名
    • Journal Title

      Nuclear Physics A 発表予定

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Direct measurement of ^4He(^<12>C,^<16>O)γ reaction cross section around E_<cm>=2.4 Mev at KUTL2005

    • Author(s)
      K.Sagara 他7名
    • Journal Title

      Nuclear Physics A 発表予定

    • Related Report
      2004 Annual Research Report
  • [Journal Article] First measurement of ^4He(^<12>C,^<16>O)γ cross section at E_<cm>=2.4 MeV2004

    • Author(s)
      K.Sagara 他5名
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 8

      Pages: 54-59

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Development of a Long-Time Chopper for Reaction Recoils2004

    • Author(s)
      K.Sagara 他5名
    • Journal Title

      Kyushu University Tandem Accelerator Laboratory Report 8

      Pages: 93-97

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Facilities for direct measurement of ^4He(^<12>C,^<16>O)γ reaction cross section at KUTL2003

    • Author(s)
      N.Ikeda, K.Sagara 他7名
    • Journal Title

      Nuclear Physics A 718

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Direct measurement of ^<12>C+^4He → ^<16>O+γreaction at stellar energy

    • Author(s)
      K., Sagara, et. al.
    • Journal Title

      Proc. of 6th China-Japan Joint Nuclear Physics Symposium (AIP Conf Proc)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A thick windowless gas target for 4He(12C, 16O) γ astro-nuclear experiment and charge fraction of reaction products2008

    • Author(s)
      T., Loki, K., sagara, et. al.
    • Organizer
      62th Annual Meeting of Phys. Soc. Japan
    • Place of Presentation
      Higashi-Osaka
    • Year and Date
      2008-03-26
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] present status of ^<12>C+^4He → ^<16>O+γ experiment at KUTL2008

    • Author(s)
      K., Sagara, et. al.
    • Organizer
      r-process nucleosynthesis and Quantum Beam
    • Place of Presentation
      Tsukuba
    • Year and Date
      2008-03-14
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Present status of12C+4He→16O+γ experiment at KUTL2008

    • Author(s)
      K.Sagara
    • Organizer
      国立天文台研究会「rプロセス元素合成の統合的理解-量子ビームでさぐる宇宙進化の理解を目指して-」
    • Place of Presentation
      筑波大学
    • Year and Date
      2008-03-14
    • Related Report
      2007 Annual Research Report
  • [Presentation] Present status of measurement of ^<12>C+^4He → ^<16>O+γ cross section by detecting ^<16>O recoils2007

    • Author(s)
      K., Sagara, et. al.
    • Organizer
      62th Annual Meeting of Phys. Soc. Japan
    • Place of Presentation
      Sapporo
    • Year and Date
      2007-09-21
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 反跳16O検出による12C+4He→16O+γ断聞積測定の現状2007

    • Author(s)
      相良 建至
    • Organizer
      日本物理学会第62圃年会
    • Place of Presentation
      北海道大学
    • Year and Date
      2007-09-21
    • Related Report
      2007 Annual Research Report
  • [Presentation] Direct measurement of ^4He(^<12>C, ^<16>O)□ cross section at Ecm = 2.4 MeV at KUTL2007

    • Author(s)
      K., Sagara, et. al.
    • Organizer
      International Nuclear Physics Conf.
    • Place of Presentation
      Tokyo
    • Year and Date
      2007-06-04
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A blow-in type windowless gas target for astro-nuclear experiments2006

    • Author(s)
      K.Sagara
    • Organizer
      23rd world conference of International Nuclear Target Development Society
    • Place of Presentation
      Tsukuba
    • Year and Date
      2006-10-24
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Experiment of ^4He(^<12>C, ^<16>O)γ reaction at Kyushu University2005

    • Author(s)
      K., Sagara
    • Organizer
      International Symposium on Origin of Matter and Evolution of Galaxies
    • Place of Presentation
      Tokyo
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Publications] N.Ikeda et al.: "Facilities for direct measurement of ^4He(^<12>C,^<16>O)γ reaction cross section at KUTL"Nuclear Physics A. 718. 558c-560c (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Sagara et al.: "First measurement of ^4He(^<12>C,^<16>O)γ cross section at E_<cm>=2.4 MeV"Kyushu University Tandem Accelerator Laboratory Report. 8. 4 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Sagara et al.: "Development of a Long-Time Chopper for Reaction Recoils"Kyushu University Tandem Accelerator Laboratory Report. 8. 3 (2004)

    • Related Report
      2003 Annual Research Report

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

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