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Study of Exotic Nuclei via Pion Double Charge Exchange Reactions

Research Project

Project/Area Number 03044142
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionNational Laboratory for High Energy Physics (KEK)

Principal Investigator

CHIBA Junsei (1992-1993)  National Laboratory for High Energy Physics, 物理研究部, 助教授 (50126124)

中井 浩二 (1991)  高エネルギー物理学研究所, 物理部, 教授 (40028155)

Co-Investigator(Kenkyū-buntansha) NAGAE Tomofumi  Institute for Nuclear Study, The University of Tokyo, 核研, 助手 (50198298)
FUKUDA Tomokazu  Institute for Nuclear Study, The University of Tokyo, 核研, 助教授 (50116092)
HASHIMOTO Osamu  Institute for Nuclear Study, The University of Tokyo, 核研, 助教授 (50092292)
IEIRI Masaharu  National Laboratory for High Energy Physics, 物理研究部, 助手 (50192472)
TANAKA Kazuhiro  National Laboratory for High Energy Physics, 物理研究部, 助手 (90171743)
OTSUKA Takaharu  Faculty of Science, The University of Tokyo, 理・物理, 助教授 (20201379)
KOBAYASHI Toshio  The Institute of Physical and Chemical Research, 副主任研究員 (30186754)
NAKAI Kozi  National Laboratoey for High Energy Physics, 物理研究部, 教授 (40028155)
STROTTMAN Daniel  Los Alamos National Lab. (U.S.A), ロスアラモス国立研究所, 主任研究員
D Strottman  ロスアラモス国立研究所, 研究員
REDWINE R.  MIT, 教授
ASHERY D.  イスラエル工科大学, 物理部, 教授
KITCHING P.  トライアンフ研究所, 研究員
BAER H.  ロスアラモス研究所, 研究員
千葉 順成  高エネルギー物理学研究所, 物理部, 助教授 (50126124)
市原 卓  理研, リニアック研究所, 研究員
Project Period (FY) 1991 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥10,000,000 (Direct Cost: ¥10,000,000)
Fiscal Year 1993: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1992: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1991: ¥4,000,000 (Direct Cost: ¥4,000,000)
KeywordsExotic Nuclei / ^<11>Li / Excited state / Pion double charge exchange / LAMPF / SKS Spectrometer / Giant Resonance / DELTA in Nuclei / π中間子二重荷電交換反応 / 二重巨大共鳴 / 核内Δ / SKSスペクトロメ-タ-
Research Abstract

(1) In order to search for a new type of a giant resonance in a nucleus having so-called neutron halo such as ^<11>Li, we have carried out an experiment of pion double charge exchange reaction, ^<11>B(pi^-, pi^+)^<11>Li, at LAMPF at Los Alamos National Laboratory in USA. We found the first excited state of the ^<11>Li nucleus in this experiment for the first time. However, we could not reach a final conclusion about the existence of the new type of a giant resonance, primarily due to a lack of machine time.
(2) With an experiment of target fragmentations in high-energy heavy-ion reactions at Bevalac at Lawrence Berkeley Laboratory, we showed experimentally that two-neutron emission in ^8He*^6He is a two-step process via a meta-stable ^7He.
(3) At the National Laboratory for High Energy Physics (KEK), the construction of a superconducting spectrometer was completed and tested thoroughly. The spectrometer has been so far used for studies of hypernuclear spectroscopy and gave us useful and new knowledge. We had several meetings with foreign researchers to discuss possible experiments of pion double charge exchange reactions at higher energies.
(4) Coincidence Measurements of (p, n) reactions at KEK showed interesting behaviours of DELTA particle in nuclei. Especially the process of coherent pion emission has attracted much attension. A similar experiment at Saclay Laboratory in France proved our results. However both measurements were not good enough to make a final conclusion on the coherent pion emission. A new experiment with much better resolution was carried out at LAMPF in 1993 and data analysis is now under progress.
(5) Concerning theoretical studies, we have studies deeply on the nuclear structure and density distribution of both neutrons and protons of unstable nuclei.

Report

(3 results)
  • 1993 Final Research Report Summary
  • 1992 Annual Research Report
  • 1991 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] T.Kobayashi: "Projectile fragmentation of Exotic Nuclear Beam" Nucl.Phys.A538. 343C (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Kobayashi: "Nuclear Structure Experiments on ^<11>Li" Nucl.Phys. A553. 465C- (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] J.Chiba T.Nagae,T.Kobayashi et.al: "Coincidence Measurements of(p,n)Reactions at 1.5GeV/c on eand H in the △ Region" Phys.Rev.Lett.67. 1982 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Kobayashi,K.Nakai et al: "Spectroscopy of Exotic Nucleis ^<11>Li via ^<11>B(π^-,π^+)^<11>Li" Phys.Rev.Lett. (投稿中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] O.Hashimoto et al: "Future Nuclear Physics Experiments with π above 0.5GeV" Nucle Phys.A527. 459C- (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] J.Chiba,O.Hashimoto,K.Tanaka et al T.Nagae: "The(π^+,K^+)Reaction on ^<12>C and ^<56>Fe" Nucle Phys.A534. 478 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Kobayashi: "Projectile fragmentation of Exotic Nuclcar Beam" Nucl.Phys.A538. 343C (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Kobayashi: "Nuclear structure Experiments on ^<11>Li" Nucl.Phys.A553. 465C (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] J.Chiba, T.Kobayashi, T.Nagae et al.: "Coincidence measurements of (p, n) Reactions at 1.5GeV/c on C and H target in The DELTA Region" Phys.Rev.Lett.67. 1982 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Kobayashi, K.Nakai et al.: "Spectroscopy of Exotic Nucleus ^<11>Li via ^<11>B(pi^-, pi^+) ^<11>Li" Phys.Rev.Lett.(submitted).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] O.Hashimoto: "Future Nuclear Physics Experiments with to above 0.5GeV" Nucl.Phys.A527. 459C (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] J.Chiba, T.Nagae, O.Hashimoto, K.Tanaka et al.: "the (pi^+, K^+) Reaction on ^<12>C and ^<56>Fe" Nucl.Phys.A534. 478 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Kobayashi: "Projectile Fragmentation of Exotic Nuclear Beams" Nucl. Phys.A538. 343C (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Kobayashi: "Nuclear structure Experiments with ^<11>Li" Nucl. Phys.印刷中. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Kobayashi: "Spectroscopy of the exotic nucleus ^<11>Li via double charge exchange reaction ^<11>B(π^-,π^+)^<11>Li" Proceedings of the exotic nucleus and reactions of unstable nuclei, Niigata. 187 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] J.Chiba et al: "Coincidence Measurements of (p,n) Reactions at 1.5Gev/c on C and H in the Δ Excitation Region" Phys. Rev. Lett.67. 1982 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] O.Hashimoto: "Future Experimental Projects with the Superconducting Kaon Spectrometer" Perspective of Meson Science. 547 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Otsuka, N.Fukunishi, H.Sagawa: "Structure of Exotic Neutron-Rich Nuclei" Phys. Rev. Lett. 70. 1385 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Kobayashi: "Spectroscopy of the Neutron-Dripline Nucleus ^<11>Li via Pion-DCX Reaction 11B(π^-,π^+) ^<11>Li" Phys.Rev.Lett.

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Kobayashi: "Spectroscopy of the Exotic Nucleus ^<11>Li via Pion Double Charge Exchange Reaction 11B(π^-,π^+) ^<11>Li" Proc.Int.Workshop on Pion in Nuclei.(World Scientific,Peniscola,Spain). (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Kobayashi: "Spectroscopy of the Exotic Nucleus ^<11>Li via Pion Double Charge Exchange Reaction 11B(π^-,π^+) ^<11>Li" Proc.Int.Symp.on Structure and Reactions of Unstable Nuclei (World Scientific,Singapore). (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Kobayashi: "Projectile Fragmenntation of Exotic Nuclear Beams" Nuclear Physics A.

    • Related Report
      1991 Annual Research Report
  • [Publications] J.Chiba: "Coincident Measurements of (p,n) Reactions at 1.5 GeV/c on C and H in the Δ Excitation Region" Phys.Rev.Lett.67. 1982-1985 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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