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2001 Fiscal Year Final Research Report Summary

Study of Hyperon Production in Nuclei by means of Neutral Kaon Measurements

Research Project

Project/Area Number 09304028
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 InstitutionTohoku University

Principal Investigator

TAKAHASHI Toshiyuki  Graduate School of Science, Tohoku University, Research Physicist, 大学院・理学研究科, 助手 (50281960)

Co-Investigator(Kenkyū-buntansha) TAMURA Hirokazu  Graduate School of Science, Tohoku University, Associate Professor, 大学院・理学研究科, 助教授 (10192642)
MAEDA Kazushige  Graduate School of Science, Tohoku University, Associate Professor, 大学院・理学研究科, 助教授 (20125652)
HASHIMOTO Osamu  Graduate School of Science, Tohoku University, Professor, 大学院・理学研究科, 教授 (50092292)
FUJII Yuu  Graduate School of Science, Tohoku University, Research Physicist, 大学院・理学研究科, 助手 (30302079)
YAMAZAKI Hirohito  Graduate School of Science, Tohoku University, Research Physicist, 大学院・理学研究科, 助手 (90260413)
Project Period (FY) 1997 – 2000
Keywordsstrangeness / neutral kaon / hyperon production / electromagnetic interaction
Research Abstract

This research aims at investigating
1 hyperon production mechanism by means of measuring the neutral kaon,
2 the role of S =-1 hyperon in the nucleus
3 hyperon-nucleon interaction through the structures of hypernuclei.
We focused on the photo-production of the neutral kaons at the threshold energy region. The measurement of the neutral kaon photo-production channel gives an important key in understanding the strangeness production mechanism by the electromagnetic interaction, since it has smaller number of terms to be considered than charged-kaon production due to the lack of charge.
After design and examinations of the neutral kaon spectrometer, we concluded that the TAGX spectrometer at INS-ES is the best one for the measurement of photo-induced neutral kaons. Therefore, after shutdown of INS-ES, the TAGX spectrometer system was moved to Tohoku University in 1998.
We proposed the experimental proposal "Quasi-Free Photoproduction of Neutral Kaon on ^<12>C near Threhold Region" at 1.2 GeV STB ring to Laboratory Nuclear Science (LNS), Tohoku University, as a first step of a series experiments on neural kaon photoproduction.
In 2000, the preparations of the laboratory equipment such as a magnet excitation test and data acquisition system proceeded as well as the detector tests. The drift chambers, which are main detectors in the spectrometer, were tested by cosmic rays and confirmed that they have good enough performance.

  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] O.Hashimoto T.Takahashi, K.Maeda, T.Tamura 他: "The (π^+,K^+) reaction and light A hyper nuclear spectroscopy"Nucl. Phys. A. 639. 83 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Takahashi: "Neutral Kaon Spectrometer"原子核研究. 43-4. 147 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Park, O.Hashimoto, T.Takahashi 他: "Lifetime measurement of medium-heavy Λ hyper nuclei"Phys. Rev. C. 61. 2000-054004

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Takahashi, O.Hashimoto 他: "Spectroscopy of light Λ hyper nuclei"Nucl. Phys. A. 670. 265 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Tamurai 他: "Observation of a spin-flip M1 transition in Λ^^7Li"Phys. Rev. Lett.. 84. 5963 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Takahashi 他: "Phetoproluctim of neutral kaon on ^<12>C in the threshed region"Nucl. Phys. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Hashimoto: "Medium and heavy A hypernuclei by the (π^+,K^+) reaction"Genshikaku Kenkyu. Vol.41 No.6. 9 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ajimura et.al: "Polarization of^5_ΛHe produced by the (π^+,K^+) reaction"Phys. Rev. Lett.. 80. 1605 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Tamura: "Hypernuclear γ spectroscopy with a Ge ball"Nucl. Phys.. A639. 83c (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Hashimoto et. al: "The (π^+,K^+) reaction and light Λ hypernuclear spectroscopy"Nucl. Phys.. A639. 9 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Sato et. al: "π^- mesonic weak decay of ^<12>_ΛC"Nucl. Phys.. A639. 279c (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Maeda: "Electromagnetic strangeness production near threshold at SPring8"Genshikaku Kenkyu. Vol.43 No.4. 141 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Takahashi: "Neutral Kaon Spectrometer"Genshikaku Kenkyu. Vol.43 No.4. 147 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Hashimoto: "Retrospect and prospect of hypernuclear physics"Proceeding of KEK-Tanashi International Symposium on "Hadron and Nuclear Physics with electromagnetic probes". 137 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Park et.al.: "Lifetime measurement of medium-heavy Λ hypernuclei"Phys. Rev.. C61. 054004 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Takahashi et. al.: "Spectroscopy of light Λ hypernuclei"Nucl. Phys.. A670. 265c (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Tamura et. al: "Observation of spin-flip M1 transition in ^7_ΛLi"Phys. Rev. Lett.. 84. 5963 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ajimura et. al: "Symmetry in non-mesonic weak decay of polarized ^5_ΛHe hypernucleus"Phys. Rev. Lett.. 84. 4052 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Takahashi et. al: "Photoproduction of neutral kaon on ^<12>C in the threshold region"Nucl Phys. (to be published).

    • 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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