1997 Fiscal Year Final Research Report Summary
Reaction mechanism of Coulomb dissociation induced by high-speed heavy ions
| Project/Area Number |
08454069
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | RIKKYO UNIVERSITY |
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Principal Investigator |
MOTOBAYASHI Toru RIKKYO UNIV., COLLEGE OF SCIENCE,PROFESSOR, 理学部, 教授 (20116114)
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| Co-Investigator(Kenkyū-buntansha) |
SAKURAGI Hiroyuki OSAKA CITY UNIV., FACULTY OF SCIENCE,ASSISTANT PROF., 理学部, 助教授 (90183821)
IZUMOTO Toshiaki RIKKYO UNIV., COLLEGE OF SCIENCE,PROFESSOR, 理学部, 教授 (80193382)
SHIMOURA Susumu RIKKYO UNIV., COLLEGE OF SCIENCE,ASSISTANT PROF., 理学部, 助教授 (10170995)
IEKI Kazuo RIKKYO UNIV., COLLEGE OF SCIENCE,ASSISTANT PROF., 理学部, 助教授 (10159577)
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| Project Period (FY) |
1996 – 1997
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| Keywords | Coulomb dissociation / E2 component / angular distribution / ^7Be(P,gamma)^8B reaction / ^8Be(P,gamma)^9B reaction / large vacuum chamber / solar neutrino / hot pp mode |
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| Research Abstract |
Reaction mechanism of intermediate-energy Coulomb dissociation has been studied by precise measurements of angular distribution and angular correlation of the fragments. A large vacuum chamber has been constructed as a housing of a plastic scintillator hodoscopes. The chamber was installed in a experimental hail of RIKEN Accelerator Research Facility, and was used for experiments with radioactive nuclear beams. Background-free measurements become possible for the relative energy lower than 0.5 MeV.
The ^<208>Pb(^8B, ^7Be p)^<208>Pb and ^<208>Pb(^9C, ^8B p) ^<208>Pb reactions were studied. The primary aim of the measurements are to determine the ^7Be (p, gamma)^8B and ^8B(p, gamma)^9C reactions. The former reaction produce high-energy solar-neutrinos, and the latter is a key reaction in the hot pp mode nuclear burning in stars. In the Coulomb dissociation method, a one-step El transition mechanism is assumed in the process of extracting the (p, gamma) cross section. However, possible small mixture of E2 transition had been pointed out. We notice that the fragments' angular distributions are different for El and E2 transitions. In the measurements, the scattering angle up to 100 was covered by the new setup to obtain complete distributions. The results suggested very small E2 components which do not affect the extracted (p, gamma) cross sections.
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[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: "Experimental Determination of the E2 Component in the Coulomb Dissociation of ^9B" Physics Letters. B391. 261-266 (1997)
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「研究成果報告書概要(欧文)」より
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[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: "Further Measurement of the ^7Be(P,gamma)^8B Cross Section at Low Energies with the Coulomb Dissociation of ^9B" European Physical Journal. A 3. 209-211 (1998)
Description
「研究成果報告書概要(欧文)」より
