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1999 Fiscal Year Final Research Report Summary

Study of nuclei with strangeness

Research Project

Project/Area Number 08239103
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

IMAI Kenichi  Graduate School of Science, Kyoto University, Professor, 大学院・理学研究科, 教授 (70025493)

Co-Investigator(Kenkyū-buntansha) MOTOBA Toshio  Lab. Of Physics, Osaka Electro-Common. Univ., Professor, 工学部, 教授 (90121863)
KISHIMOTO Tadafumi  Osaka University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (90134808)
FUKUDA Tomokazu  High Energy Accelerator Research Organization, Associate Professor, 助教授 (50116092)
TAMURA Hirokazu  Tohoku University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (10192642)
HASHIMOTO Osamu  Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (50092292)
Project Period (FY) 1996 – 1999
KeywordsHypernuclear / Strangeness / K mesonic / SU(3)symmetry / Hypernuclei / Hyperon
Research Abstract

The purpose of this research project is to discover the world of nuclei with strangeness and solve the various current problems in the strangeness nuclear physics. We have developed new experimental techniques and devices in order to perform high precision experiments on nuclei with s=-1 and to discover nuclei with s=-2. We have also organized a systematic theoretical study on strangeness nuclear physics along with the experimental programs. We have constructed a Ge-ball detector (Hyperball) for the γ-spectroscopy of hypernuclei. The M1 and E2 γ transitions ィイD17ィエD1LiィイD2ΛィエD2 and ィイD19ィエD1BeィイD2ΛィエD2 were clearly observed for the first time with Ge detectors. The spin-dependent fine-structures of hypernuclei were extensively studied with these new data. The lifetimes and decay branching ratios were also extensively measured for heavier hypernuclei which revealed new aspects of the ΛN weak interaction. It has been extensively studied with OBE and "quark" - model. The nuclei with s=-2 have been searched for with various methods such as a new hybrid-emulsion detector and a cylindrical π spectrometer (CDS) which were constructed in this research project. The experiments with these detectors were successfully carried out at KEK and BNL. The discovery of new s=-2 nuclei are quite probable. The evidence of Ξ-nuclei was already obtained. The hyperon-nucleon interaction has been studied both in quark models and OBE models. The Σ-p scattering experiments were also performed and provided new cross section data which should improve our understanding on hypernuclei.
We have hosted 5 international and 8 domestic conferences to promote and organize the research on strangeness nuclear physics. More than 100 papers have been published in this research project.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] H. Tamura et al.: "High-resolution hypernuclear gamma-ray spectroscopy"Nucl. Phys. A. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Tamura: "Future Plans of High-Resolution Hypernuclear Gamma-Spectroscopy"Proc. APCTP Workshop on Strangeness Nuclear Physics (SNP'99), SEOUL, Feb. 1999. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Nabetani et al.: "Spin observables in the pn-> pΛ reaction"Phys. Rev.. C60. 017001 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Kishimoto: "Kaonic nuclei excited by the (Κ^-, Ν) reaction"Phys. Rev. Lett.. 83. 4701 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Yamamoto et al.: "Search for double-Λ hypernuclei and the H-dibaryon in the (Κ^-, Κ^+) reaction on ^<12>C"Phys Lett.. (to be published).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] P. Khaustov et al.: "Search for double-Λ hypernuclei formation via (Ξ^-, ^<12>C)_<atom>->^<12>_<ΛΛ>B+^n"Phys. Rev.. C61. 027601 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Tamura et al.: "High-resolution hypernuclear gamma-ray spectroscopy"Nuel. Phys. A. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Tamura: "Future Plans of High-Resolution Hypeynuclear Gamma-Spectroscopy"Proc. APCTP Workshop on Strangeness NuclearPhysics (SNP'99), SEOUL. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Nabetani et al.: "Spin observables in the pn -> pΛ reaction"Phys. Rev.. C60. 017001 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Kishimoto: "Kaonic nuclei excited by the (K, N) reaction"Phys. Rev. Lett.. 83. 4701 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Yamamoto et al.: "Search for double-Λ hypernuclei and the H-dibaryon in the (KィイD1-ィエD1, HィイD1+ィエD1) reaction on ィイD112ィエD1C"Phys. Lett.. (to be published).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] P. Khaustov et al.: "Search for double-Λ hypernuclei formation via (ΞィイD1-ィエD1, ィイD112ィエD1C)ィイD2atomィエD2 -> ΛィイD112ィエD1ΛB+n"Phys. Rev.. C61. 027601 (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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