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Measurements of thermonuclear reaction rates for light nuclei with intermediate-energy RI beams

Research Project

Project/Area Number 10304021
Research Category

Grant-in-Aid for Scientific Research (A)

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

Principal Investigator

MOTOBAYASHI Toru  RIKKYO UNIV COLLEGE OF SCIENCE PROFESSOR, 理学部, 教授 (20116114)

Co-Investigator(Kenkyū-buntansha) IZUMOTO Toshiaki  RIKKYO UNIV COLLEGE OF TOURISM PROFESSOR, 観光学部, 教授 (80193382)
SHIMOMURA Susumu  TOKYO UNIV FACULTY OF SCIENCE PROFESSOR, 大学院・理学系研究科, 教授 (10170995)
IEKI Kazuo  RIKKYO UNIV COLLEGE OF SCIENCE PROFESSOR, 理学部, 教授 (10159577)
KAJINO Toshitaka  NATIONAL ASTRONOMICAL OBSERVATORY ASSIST PROFESSOR, 教授 (20169444)
SHIBAZAKI Noriaki  RIKKYO UNIV COLLEGE OF SCIENCE PROFESSOR, 理学部, 教授 (50206124)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥36,800,000 (Direct Cost: ¥36,800,000)
Fiscal Year 2000: ¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1999: ¥12,800,000 (Direct Cost: ¥12,800,000)
Fiscal Year 1998: ¥20,100,000 (Direct Cost: ¥20,100,000)
KeywordsRI beam / Coulomb dissociation reaction / hot pp-mode / CNO cycle / rp-process / solar neutrino / explosive hydrogen burning / inelastic scattering / 不安定核ビーム / クーロン分解 / rp-過程 / hot ppモード / 爆発的熱焼 / ^<23>Al / ^<13>O / E1共鳴 / クーロン励起 / CsI(Tl)シンチレータ / 光ダイオード / 液体水素 / 天体核反応 / 熱核反応
Research Abstract

Using the fast RI beams provided by the RIPS beam course at RIKEN Accelerator Research Facility, we measured several reactions in the hot pp-mode, hot CNO cycle, and rp process. An experiment to test the validity of the Coulomb dissociation method was also performed. The reaction mechanism of the ^8B Coulomb dissociation, which is related to the solar neutrino problem, was investigated.
1 The reactions in the hot pp mode, ^8B(p,γ)^9C, ^<11>C(p,γ)^<12>N, and ^<12>N(p,γ)^<13>O, were studied by the Coulomb dissociation. The results were considerably different from what have been used in network calculations for the hot pp mode.
2 The Coulomb dissociation of ^<13>N through its 1/2^+ state was studied. From the measured cross section, the radiative width Γ_γ=0.51±0.04 eV was extracted. Its agreement with direct measurements, 0.50±0.04 eV, demonstrates the validity of the method.
3 Inelastic scattering of ^<15>O to its 3/2+ state at 6.793 MeV was measured. An upper limit of the transition probability was extracted. The result suggests only small influence of the state to the CNO cycle nuclear burning.
4 Coulomb dissociation of ^<23>A1 was measured to determine the ^<22>Mg(p,y)^<23>A1 reaction. The E2 transition to the first excited state, which is considered to be important in the rp-process, was consistent with the evaluation by Wiescher et al., thouth the error is large.
5 Cross sections in a wide angular range for the ^8B Coulomb dissociation was analyzed. Together with the data obtained by our GSI experiment at a higher incident energy, the mixture of the E2 transitions was expected to be small.

Report

(4 results)
  • 2001 Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] T.Kikuchi et al.: "Measurement of the ^7Be_<(P,Y)>^8B Cross Section at Low Energies with the Coulomb Dissociation of ^8B"European Physical Journal. A3. 209-211 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] N.Iwasa et al.: "Measurement of the Coulomb Dissociation of ^8B at 254 MeV/nucleon l and the ^8B Solar Neutrino Flux"Physical Review Letters. 83. 2910-2913 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] D.Beaumel et al.: "Determination of the Astrophysical S factor of the ^8B_<(P,Y)>^9C Capture Reaction from the d(^8B,^9C)n Reaction"Physics Letters. B514. 226-232 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Motobayashi: "Indirect Measurement of the Solar-Neutrino Production Reaction ^7Be_<(P,Y)>^8B"Nuclear Physics. A693. 258-268 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Kikuchi, T. Motobayashi, N. Iwasa, Y. Ando, M. Kurokawa, S. Moriya, H. Murakami, T. Nishio, J. Ruan, S. Shimoura, S. Shirato, T. Uchibori, Y. Yanagisawa, T. Kubo, H. Sakurai, T. Teranishi, Y. Watanabe, M. Ishihara, M. Hirai, T. Nakamura, S. Kubono, M. Gai, R.H. France III, K.I. Hahn, Th. Delbar, P.Lipnik and C. Michotte: "Measurement of the ^7Be(p.γ)^8B Cross Section at Low Energies with the Coulomb Dissociation of ^8B"European Physical Journal. A3. 209-211 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] N. Iwasa, F. Bou'e, G. Surowka, K. Summerer, T. Bau-mann, B. Blank, S. Czajkowski, A. Forster, M. Gai, H. Geissel, E. Grosse, M. Hellstrom, P. Koczon, B. Kohlmeyer, R. Kulessa, F. Laue, C. Marchand, T. Motobayashi, H. Oeschler, A. Ozawa, M.S. Pravikoff, E. Schwab, W. Schwab, P. Senger, J. Speer, C. Sturm, A. Surowiec, T. Teranishi, F. Uhlig, A. Wagner, W. Walus, and C.A. Bertulani: "Measurement of the Coulomb Dissociation of ^8B at 254 MeV/nucleon and the ^8B Solar Neutrino Flux"Physical Review Letters. 83. 2910-2913 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] D. Beaumel, T. Kubo, T. Teranishi, H. Sakurai, S. Fortier, A. Mengoni, N. Aoi, N. Fukuda, M. Hirai, N. Imai, H. Iwasaki, H, Kumagai, H. Laurent, S.M. Lukyanov, J.M. Maison, T. Motobayashi, T. Nakamura, H. Ohnuma, S. Pita, K. Yoneda and M. Ishihara: "Determination of the Astrophysical S factor of the ^8B(p,γ)^9C Capture Reaction from the d(^8B,^9C)n Reaction"Physics Letters. B514. 226-232 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Motobayashi: "Indirect Measurement of the Solar-Neutrino Production Reaction ^7Be(p,γ)^8B"Nuclear Physics. A693. 258-268 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Motobayashi: "Nuclear astrophysics experiments with intermediate-energy RI beams"Nuclear Physics. A682. 345-355 (2001)

    • Related Report
      2000 Annual Research Report

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

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