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2005 Fiscal Year Final Research Report Summary

Proton quasifree scattering at 1 GeV and medium effects in nuclear field

Research Project

Project/Area Number 15340080
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionKyushu University

Principal Investigator

NORO Tetsuo  Kyushu University, Department of Physics, Professor, 大学院理学研究院, 教授 (30164750)

Co-Investigator(Kenkyū-buntansha) SAGARA Kenshi  Kyushu University, Department of Physics, Professor, 大学院理学研究院, 教授 (00128026)
SAKAGUCHI Harutaka  Kyoto University, Department of Physics, Ass.Prof., 大学院理学研究科, 助教授 (30025465)
HATANAKA Kichiji  Osaka University, Res.Center for Nucl.Phys., Professor, 核物理研究センター, 教授 (50144530)
WAKASA Tomotsugu  Kyushu University, Department of Physics, Ass.Prof., 大学院理学研究院, 助教授 (10311771)
Project Period (FY) 2003 – 2005
KeywordsProton quasifree scattering / medium effects / polarization / relativistic effect
Research Abstract

This program was mainly performed as an international collaboration experiment held at Petersburg Nuclear Physics Institute in Russia by using the 1 GeV synchrocyclotron. Experiments at 400 MeV proton beam by using the cyclotron complex at Research Center for Nuclear Physics, Osaka University, and a collaboration work with Prof. Hillhouse, University of Schtellenbosch in South Africa, are also important parts of this program. Prof. Hillhouse stayed at Fukuoka for two to four months in 2004 and 2005, respectively. The purpose of this program was to investigate Dirac relativistic effects, which is one of possible nuclear medium effects in the hadronic level..
The experiments in Russia were performed twice and the proton quasifree scattering off a 160 target, which is a p-shell nucleus, and a 40Ca target, an sd closed-shell nucleus. In the former case, only the differential cross section were measured for a reason in the preparation of detector system, while both of the cross section and induced polarization were measured in the latter case.
It is a long staying problem that the analyzing power (Ay) for proton quasifree scattering is significantly reduced from the values estimated by using the nucleon-nucleon interaction in free space, but we firstly compare the reduction rate in a wide incident-energy region quantitatively. The result shows that the reduction rate is similar for both of 1 GeV and 400 MeV energies, from which we can conclude that the reduction is not caused by mixture of some complicated processes as two-step processes. From an experimental result with many kinds of target nuclei, it is also found that this reduction shows a monotone function of the Q-value of the reaction. From the theoretical side, it is found that only 50% of this reduction is explained as a Dirac relativistic effect. This may suggest existence of some additional medium effect, such as meson-mass modifications.

  • Research Products

    (10 results)

All 2006 2005 2004 2003

All Journal Article (10 results)

  • [Journal Article] Influence of relativistic dynamics and density-dependent corrections on the induced polarization and analyzing power for exclusive 1st/2 proton knockout in ^<12>C2006

    • Author(s)
      G.C.Hillhouse, T.Noro
    • Journal Title

      Phys. Rev. C 74

      Pages: 064608-1-8

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Influence of relativistic dynamics and density-dependent corrections on the induced polarization and analyzing power for exclusive 1s12 proton knockout in 12^C2006

    • Author(s)
      G.C.Hillhouse, T.Noro
    • Journal Title

      Phys.Rev. C74

      Pages: 064608-1-064608-8

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Analyzing powers for exclusive 1st/2 proton knockout from light nuclei2005

    • Author(s)
      T.Noro et al.
    • Journal Title

      Phys. Rev. C 72

      Pages: 014602(R)-1-5

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Analyzing powers for exclusive 1s/2 proton knockout from light nuclei2005

    • Author(s)
      T.Noro et al.
    • Journal Title

      Phys.Rev. C72

      Pages: 014602(R)-1-014602(R)-5

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Polarization in quasielastic (p, 2p) scattering on a ^4He nucleus at 1 GeV2004

    • Author(s)
      O.V.Miklukho et al.
    • Journal Title

      Phys. Atom. Nucl. 69

      Pages: 474-481

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Polarization for Proton Knockout Reactions from s_<1/2>-Orbits at 1 GeV2004

    • Author(s)
      V.A.Andreev et al.
    • Journal Title

      Phys. Rev. C 69

      Pages: 024604-1-7

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Polarization in quasielastic (p, 2p) scattering on a 4^He nucleus at 1 GeV2004

    • Author(s)
      O.V.Miklukho et al.
    • Journal Title

      Phys.Atom.Nucl. 69

      Pages: 474-481

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Polarizations for Proton Knockout Reactions from s1/2-Orbits at 1 GeV2004

    • Author(s)
      V.A.Andreev et al.
    • Journal Title

      Phys.Rev. C69

      Pages: 024604-1-024604-7

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Relativistic Predictions of Spin Observables for Exclusive Proton Knockout Reactions2003

    • Author(s)
      G.C.Hillhouse et al.
    • Journal Title

      Phys. Rev. C 68

      Pages: 034608-1-11

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Relativistic Predictions of Spin Observables for Exclusive Proton Knockout Reactions2003

    • Author(s)
      G.C.Hillhouse et al.
    • Journal Title

      Phys.Rev. C68

      Pages: 034608-1-034608-11

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

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Published: 2008-05-27  

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