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Study of Hyperon-Nucleon Interaction

Research Project

Project/Area Number 12304013
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 InstitutionKyoto University

Principal Investigator

IMAI Kenichi  Kyoto University, Department of Physics, Professor, 大学院・理学研究科, 教授 (70025493)

Co-Investigator(Kenkyū-buntansha) SAITO Naohito  Kyoto University, Department of Physics, Associate Professor, 大学院・理学研究科, 助教授 (20321763)
FUNAHASHI Haruhiko  Kyoto University, Department of Physics, 大学院・理学研究科, 助手 (00283581)
YOSOI Masaru  Kyoto University, Department of Physics, 大学院・理学研究科, 助手 (80183995)
延與 秀人  京都大学, 大学院・理学研究科, 助教授 (30213606)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥40,620,000 (Direct Cost: ¥34,200,000、Indirect Cost: ¥6,420,000)
Fiscal Year 2002: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Fiscal Year 2001: ¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
Fiscal Year 2000: ¥12,800,000 (Direct Cost: ¥12,800,000)
KeywordsHyperon / Hypernuclei / Strangeness / Time Projection Chamber / Exotic hadrons / QCD / ハイベロン
Research Abstract

We have made several discoveries in hypernuclear physics. During the analysis of the nuclear emulsion obtained by KEK-E373 experiment, we found several double hypernuclei. One is ^6He_ΛΛ nucleus and its mass was precisely determined. From the binding energy of the two Λ of this nucleus, ΛΛ interaction was determined to be weakly attractive for the first time. The result is quite important to construct models of baryon-baryon was interaction. The high precision γray spectroscopy of hypernuclei has provided very rich physics results. Recent measurements with Hyperball for ^7Li,^9Be and ^<16>O hypernuclei have almost determined ΛN spin-dependent interaction, such as spin-spin, spin-orbit and tensor interaction. Especially, spin-orbit interaction determimed by a level splitting of 40kev of spin doublet states of ^9Be hypernucleus was found very weak compared to the nucleon-nucleon case by almost two orders of magnitude.
At KEK-PS, we have performed an experiment (E522) with a 1.66GeV/c K- b … More eam to study a possible H-dibaryon resonance and ΞN interaction. We took a largest data for (K-,K+) reactions with a scintillating fiber active target. We have analyzed counter data and visual data obtained by the scintillating fiber. About 40k (K-,K+) reactions were scanned with computer-aided scanning system. Among them we have obtained about 200 events which show emission of two Λ from the (K-K+) reaction vertices. The invariant mass spectrum of the two Λ shows a peak near the threshold which may suggest the existence of H-dibaryon resonance.
We have constructed a Time Projection Chamber (TPC) for the study of hyperon resonances with Laser Compton γ beam at Spring-8. The characteristics of the TPC is that a target is located inside the TPC. This makes it possible to detect decays of low energy hyperons which has only a few cm flight length. The primary goal is to measure Λ(1405) with nuclear targets to clarify its structure. We have studied the properties of the TPC with cosmic rays. We have obtained the position resolution of 300μm and 500μm in Θ and z directions, respectively. In the end of 2003, we installed the TPC in a superconducting solenoid and started data taking together with a forward spectrometer with the γbeam. The TPC has been successfully operated at the beam rate of 10^6 Hz. Preliminary analysis shows that charged particle tracks are clearly recorded by the TPC. Less

Report

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

    (37 results)

All 2005 2004 2002 2001 2000 Other

All Journal Article (20 results) Publications (17 results)

  • [Journal Article] φ photo-production from Li, C, Al, and Cu nuclei at E_Y = 1.5-2.4 GeV2005

    • Author(s)
      T.Ishikawa, et al.
    • Journal Title

      Physics Letters B 608

      Pages: 215-222

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Φ photo-production from Li, C, Al, and Cu nuclei at E_γ=1.5-2.4 GeV2005

    • Author(s)
      T.Ishikawa, et al.
    • Journal Title

      Physics Letters B608

      Pages: 215-222

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Hypernuclear Fine Structure in 16__∧O and ΛN Tensor Interaction2004

    • Author(s)
      M.Ukai, et al.
    • Journal Title

      Physical Review Letter 93

      Pages: 232501-232501

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Hypernuclear Fine Structure in ^<16>_ΛO and the ΛN Tensor Interaction2004

    • Author(s)
      M.Ukai, et al.
    • Journal Title

      Physical Review Letter 93

      Pages: 232501-232501

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Hypernuclear Fine Structure in 9__∧B_E2002

    • Author(s)
      H.Akikawa, et al.
    • Journal Title

      Physical Review Letter 88

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Scintillating-fiber-block detector for studying double-strangeness nuclei2002

    • Author(s)
      H.Takahashi, et al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A 483

      Pages: 689-697

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Hypernuclear Fine Structure in ^9_ΛB_E2002

    • Author(s)
      H.Akikawa, et al.
    • Journal Title

      Physical Review Letters 88

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Scintillating-fiber- block detector for studying double-strangeness nuclei2002

    • Author(s)
      H.Takahashi, et al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A483

      Pages: 689-697

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Observation of a 16__∧∧H_E Double Hypernucleus2001

    • Author(s)
      H.Takahashi, et al.
    • Journal Title

      Physical Review Letter 87

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Measurement of the B(E2) of 7_∧Li and Shrinkage of the Hypernuclear Size2001

    • Author(s)
      K.Tanida, et al.
    • Journal Title

      Physical Review Letter 86

      Pages: 1982-1985

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Observation of a ^6_<ΛΛ>H_E Double Hypernucleus2001

    • Author(s)
      H.Takahashi, et al.
    • Journal Title

      Physical Review Letters 87

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Measurement of the B(E2) of ^7_ΛLi and Shrinkage of the Hypernuclear Size2001

    • Author(s)
      K.Tanida, et al.
    • Journal Title

      Physical Review Letters 86

      Pages: 1982-1985

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Production of twin Λ-hypernuclei from Ξ^- hyperon capture at rest2001

    • Author(s)
      A.Ichikawa, et al.
    • Journal Title

      Physics letters B500

      Pages: 37-46

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Production of twin Λ-hypernuclei from Ξ ̄ hyperon capture at rest2000

    • Author(s)
      A.Ichikawa, et al.
    • Journal Title

      Physics Letters B 500

      Pages: 37-46

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] H-dibaryon and hypernucleus formation in the Ξ-12C reaction at rest2000

    • Author(s)
      J.K.Ahn, et al.
    • Journal Title

      Physical Review C62

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Observation of a Spin-Flip M1 Transition in 7__∧Li2000

    • Author(s)
      H.Tamura, et al.
    • Journal Title

      Physical Review Letters 84

      Pages: 5963-5966

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Σ ̄p elastic-scattering in the region of 400<ρΣ- <700 MeV/c with a scintillating-fiber active target2000

    • Author(s)
      Y.Kondo, et al.
    • Journal Title

      Nuclear Physics A 676

      Pages: 371-387

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] H-dibaryon and hypernucleus formation in the Ξ^<-12>C reaction at rest2000

    • Author(s)
      J.K.Ahn, et al.
    • Journal Title

      Physical Review C62

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Observation of a Spin-Flip M1 Transition in ^7_ΛLi2000

    • Author(s)
      H.Tamura, et al.
    • Journal Title

      Physical Review Letters 84

      Pages: 5963-5966

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Journal Article] Σ^-p elastic-scattering in the region of 400<pΣ-<700MeV/c with a scintillating-fiber active target2000

    • Author(s)
      Y.Kondo, et al.
    • Journal Title

      Nuclear Physics A676

      Pages: 371-387

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Akikawa et al.: "Hypernuclear fine structure in Λ^^9 Be and the spin-orbit force of Λ"Phys. Rev. Lett.. 88. 082501-1-082501-4 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Takahashi et al., (KEK-E373 collaboration): "Observation of the <ΛΛ>^^^6He Double-Hypernucleus"Phys. Rev. Lett.. 87. 212502-1-212502-4 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Tanida et al., (KEK-E419 collaboration): "Measurement of the B(E2) of Λ^^7Li and shrinkage of the hypernuclear size"Phys. Rev. Lett.. 86. 1982-1985 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] A.Ichikawa et al.: "Production of twin Λ-hypernuclei from Ξ-hyperon capture at rest"Phys.Lett.. B500. 37-46 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] J.K.Ahn et al., (KEK-E289 collaboration): "Active target-detector with scintillating fibers for hyperon-proton scattering"Nucl. Instr. and Methods. A457. 137-150 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] J.K.Ahn et al., (KEK-E224 collaboration): "H-dibaryon and hypernucleus formation in the Ξ^<-12>C reaction at rest"Phys.Rev.. C62. 055201(12) (2000)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ken'ichi IMAI: "Photo-production of Λ(1405) and K^* (890) from Nuclei"Physics with GeV Elecreons and Gamma-Rays. 36. 163-167 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Akikawa et al.(BNL-E930 collaboration): "Hypernuclear fine structure in ^9_ΛBe and the spin-orbit force of Λ"Phys.Rev.Lett.. (in press).

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Takahashi et al.(KEK-E373 collaboration): "Observation of the ^6_<ΛΛ>He Double-Hypernucleus"Phys.Rev.Lett.. 87. 212502-1-212502-4 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Tanida et al.(KEK-E419 collaboration): "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] A.Ichikawa et al.(KEK-E373 collaboration): "Production of twin Λ-hypernuclei from Ξ^-hyperon capture at rest"Phys.Lett.. B500. 37-46 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] J.K.Ahn et al.(KEK-E289 collaboration): "Active target-detector with scintillating fibers for hyperon-proton scattering"Nucl.Instr.and methods. A457. 137-150 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Kondo et al.,(KEK-E289 collaboration): "Σ-p elastic scattering in the region of-100-700 MeV/c with a scintillating fiber active target"Nucl.Phys.. A676. 371-387 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Tamura et al.,: "Observation of a Spin-Flip M1 Transition in <7【chemical formula】>Li"Phys.Rev.Lett.. 84. 5963-5966 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] J.K.Ahn et al.,(KEK-E224 collaboration): "H-dibaryon and hypernucleus formation in the Ξ^<-12>C reaction at rest"Phys.Rev.. C62. 055201(12) (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] J.K.Ahn et al.,(KEK-E289 collaboration): "Active target-detector with scintillating fibers for hyperon-proton scattering"Nuclear Instruments and Methods in Physics Research Section. A457(1-2). 137-150 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Ichikawa et al.,(KEK-E373 collaboration): "Production of twin A-hypernuclei from Ξ-hyperon capture at rest"Phys.Lett.. B500(1-2). 37-46 (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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