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電磁プローブによるラムダハイパー核の研究

Research Project

Project/Area Number 12002001
Research Category

Grant-in-Aid for Specially Promoted Research

Allocation TypeSingle-year Grants
Review Section Physics
Research InstitutionTohoku University

Principal Investigator

橋本 治  東北大学, 大学院・理学研究科, 教授 (50092292)

Co-Investigator(Kenkyū-buntansha) 加藤 静吾  山形大学, 理学部, 教授 (70013422)
藤井 優  東北大学, 大学院・理学研究科, 助手 (30302079)
中村 哲  東北大学, 大学院・理学研究科, 助教授 (50280722)
前田 和茂  東北大学, 大学院・理学研究科, 助教授 (20125652)
高橋 俊行  東北大学, 大学院・理学研究科, 助手 (50281960)
田村 裕和  東北大学, 大学院・理学研究科, 助教授 (10192642)
Project Period (FY) 2000 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥516,000,000 (Direct Cost: ¥420,000,000、Indirect Cost: ¥96,000,000)
Fiscal Year 2003: ¥45,500,000 (Direct Cost: ¥35,000,000、Indirect Cost: ¥10,500,000)
Fiscal Year 2002: ¥162,500,000 (Direct Cost: ¥125,000,000、Indirect Cost: ¥37,500,000)
Fiscal Year 2001: ¥208,000,000 (Direct Cost: ¥160,000,000、Indirect Cost: ¥48,000,000)
Fiscal Year 2000: ¥100,000,000 (Direct Cost: ¥100,000,000)
Keywordsストレンジネス核物理 / Λハイパー核分光 / Λハイパー核構造 / ハドロン間相互作用 / (e,e'K+)反応 / GeV連続電子線ビーム / 中性K中間子生成 / (e, e'K+)反応 / CEBAF / ∧ハイパー核 / ∧ハイパー核構造
Research Abstract

本研究は、ラムダ・ハイパー核を電磁相互作用によって研究し、"奇妙さ"量子数を持つハドロン多体系のユニークな構造、ラムダ核子間相互作用を究明することを目的とする。我々は(π+、K+)反応の特長を生かしたラムダハイパー核実験研究を成功させ、高精度高効率分光研究を確立した。本研究では中間子ビームの対極にある電磁相互作用によるラムダハイパー核生成過程の特長を最大限に生かし、Λハイパー核構造の定量的研究を質的に発展させることを目標とする。(1)既に米国ジェファーソン研究所で高エネルギー連続電子線ビームを用いて(e,e'K+)反応による分解能900keVのラムダ・ハイパー核分光に初めて成功した。この実験の成功をもとに、実験効率を50倍以上、分解能も3-400keVの分光実験を実現するため高分解能K中間子スペクトロメータの建設を本研究の中心プロジェクトとして進めた。本年度は特に、既に完成した大型磁石(QQD)の精密磁場測定およびその詳細な解析をほぼ終了した。また,これらのスペクトロメータ磁石および製作したスペクトロメータの粒子飛行時間測定器,粒子軌跡検出器をジェファーソン研究所に搬入し,現地においての励磁に成功しまもなく実験を開始できるところまで準備を進めた。本スペクトロメータを用いた実験により、重いΛハイパー核束縛状態の構造を精密に測定し核内におけるストレンジクォークの役割を究明する。(2)一方、東北大学原子核理学研究施設1.2GeV周回電子線を用い、標識化光子による1GeV近傍でのストレンジネス生成素過程の研究をすすめ,初めて^<12>Cおよび重水素ターゲットによる中性K中間子生成過程の測定に成功した。この研究は、上記電子線ビームによるΛハイパー核生成過程を解析する上で重要な役割を果たす。現在、詳細な解析が進行中であり、同時に電磁相互作用によるストレンジネス生成過程に関する理論模型との比較を行っている。

Report

(4 results)
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (35 results)

All Other

All Publications (35 results)

  • [Publications] O.Hashimoto: "Hypernuclear physics in the S=-1 sector"Journal of Korean Physical Society. 43. S50-S57 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Miyoshi, O.Hashimoto, Y.Fujii, T.Takahashi, et al.: "A silicon strip detector used as a high-rate focal plane sensor for electrons in a magnetic spectrometer"Nucl.Intrum.Meth.. A496. 362-372 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Miyoshi, O.Hashimoto, Y.Fujii, T.Takahashi, S.Nakamura: "High resolution spectroscopy of the ^<12>_ΛB hypernucleus produced by the (e,e'K+) reaction"Physical Review Letters. 90. 232502 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Takahashi, O.Hashimoto, H.Kanda, K.Maeda, H.Tamura, et al.: "Photoproduction of neutral kaons on C in the threshold region"Nuclear Physics. A721. 991c-994c (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Fujii, O.Hashimoto, T.Takahashi, K.Maeda, H.Kanda, et al.: "New (e,e'K^+) hypernuclear spectroscopy with a high resolution kaon spectrometer"Nuclear Physics. A721. 1079c-1082c (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.H.Kim, O.Hashimoto, T.Takahashi, H.Tamura, et al.: "Neutron Energy Spectra from the nonmesonic weak decay of ^<12>ΛC and ^<89>_ΛY Hypernuclei"Phys.Reviews. C68. 065201 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] D.Gaskel, O.Hashimoto, T.Takahashi: "Measurement of longitudinal and transverse cross-sections in the ^3He(e,e'π^+)3H reaction at W = 1.6 GeV"Physical Review. C65. 011001 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] J.Peterson, O.Hashimoto, Y.Fujii, T.Takahashi: "Mesonic Y Scaling"Physical Review. C65. 054601 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Noumi, O.Hashimoto, T.Tamura, K.Maeda, T.Takahashi: "Sigma Nucleus Potential in A = 28"Phys.Rev.Lett.. 89. 072301 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Miyoshi, O.Hashimoto, T.Takahashi, Y.Fujii: "A Silicon Strip Detector Used as a High Rate Focal Plane Sensor for Electrons in a Magnetic Spectrometer"Nucl.Instr.Meth.. A496. 362-372 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Akikawa, H.Tamura, L.Tang, et al.: "Hypernuclear Fine Structure in ^9_ΛBe"Phys.Rev.Lett.. 88. 0825001 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Kohri, H.Tamura et al.: "STUDY OF THE C-13(LAMBDA) HYPERNUCLEUS BY THE C-13(K-, PI-GAMMA) REACTION"Physical Review. C65. 034607 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Park, O.Hashimoto, K.Maeda, T.Takahashi, 他: "Lifetime measurement of medium-heavy Λ hypernuclei"Phys.Rev.. C61. 054004 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] O.Hashimoto: "Retorospect and prospect of hypernuclear physics"Proc. of KEK-Tanashi International Symposium, "Hadron and nuclear physics with electromagnetic probes". 137 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Takahashi, Y.Fujii, O.Hashimoto, 他: "Sectroscopy of light Λ hypernuclei"Nucl.Phys.. A670. 265 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Ajimura, O.Hashimoto, K.Maeda, T.Takahashi, 他: "Symmetry in the non-mesonic weak decay of polarized ^5_ΛHe hypemucleus"Phys.Rev.Lett.. 84. 4052 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Outa, H.Hashimoto, K.Maeda, T.Takahashi, 他: "Mesonic and non-mesonic decay widthes of ^<12>_ΛC"Nucl.Phys.. A670. 281 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Tamura, H.Hashimoto, T.Takahashi, 他: "Observation of a spin-flip Ml transition in ^7_ΛLi"Phys.Rev.Lett.. 84. 5963 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] O.Hashimoto: "Reaction spectroscopy Λ hypernuclei"Proceedings of the APCTP Workshop (SNP'99). 84. 4052 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Tamura, Y.Fujii, O.Hashimoto, T.Takahashi: "High-resolution gamma spectroscopy of ^7_ΛLi and ^9_ΛBe"Few Body Syst.Suppl.. 12. 342-346 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] O.Hashimoto: "Facilities for hypernuclear physics at JHF and Jlab"Nucl.Phys.. A691. 457-463 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Takahashi, Y.Fujii, O.Hashimoto: "Photoproduction of neutral kaon on ^<12>C in threshold region"Nucl.Phys.. A691. 387-390 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Tanida, H.Tamura, Y.Fujii, O.Hashimoto, T.Takahashi: "Measurement of the B(E2) of ^7_ΛLi and shrinkage of the hypernuclear size"Phys.Rev.Lett.. 86. 1982-1985 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Sato, O.Hashimoto, K.Maeda, T.Takahashi: "The π^-mesonics decay rates on ^<12>_ΛC, ^<28>_ΛSi, and _ΛFe"Nucl.Phys.. A691. 189-192 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Bhang, O.Hashimoto, K.Maeda, T.Takahashi: "Overview of Λ-hypernuclear weak decay results obtained with the SKS"Nucl.Phys.. A691. 156-162 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Noumi, Y.Fujii, O.Hashimoto, T.Takahashi, H.Tamura: "Structure of ^7_ΛLi and ^9_ΛBe hypernuclei"Nucl.Phys.. A691. 123-126 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Fujii, O.Hashimoto, T.Takahashi: "Quasielastic π-nucleus scattering at 950 MeV/c"Phys.Rev.. C64. 034608 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Hotchi, O.Hashimoto, T.Tamura, T.Takahashi: "Spectroscopy of medium heavy lambda hypernuclei via the (π^+, K^+) reaction"Phys.Rev.. C64. 044302 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Park,O.Hashimoto,K.Maeda,T.Takahashi, 他: "Lifetime measurement of medium-heavy ∧ hypernuclei"Phys.Rev.. C61. 054004 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] O.Hashimoto: "Retorospect and prospect of hypernuclear physics"Proc.of KEK-Tanashi Int.Nat'l symposium, "Hadrond nuclear physics with electromagnetic probes". 137 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Takahashi,Y.Fujii,O.Hashimoto, 他: "Spectroscopy of light ∧ hypernuclei"Nucl.Phys.. A670. 265 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Ajimura,O.Hashimoto,K.Maeda,T.Takahashi, 他: "Symmetry in the non-mesonic weak decay of polarized 5∧He hypernucleus"Phys.Rev.Lett.. 84. 4052 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Outa,O.Hashimoto,K.Maeda,T.Takahashi, 他: "Mesonic and non-mesonic decay widths of 12∧C"Nucl.Phys.. A670. 281 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Tamura,O.Hashimoto,T.Takahashi, 他: "Observation of a spin-flip M1 transition in 7∧Li"Phys.Rev.Lett.. 84. 5963 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] O.Hashimoto: "Reaction Spectroscopy of ∧ hypernuclei"Proceedings of the APCTP Workshop (SNP'99). 84. 4052 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2018-03-28  

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