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2001 Fiscal Year Final Research Report Summary

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
KeywordsRI beam / Coulomb dissociation reaction / hot pp-mode / CNO cycle / rp-process / solar neutrino / explosive hydrogen burning / inelastic scattering
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.

  • Research Products

    (8 results)

All Other

All Publications (8 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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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

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Published: 2003-09-17  

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