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2015 Fiscal Year Annual Research Report

核構造におけるテンソル力の効果と隠された相互作用の研究

Research Project

Project/Area Number 23224008
Research InstitutionOsaka University

Principal Investigator

谷畑 勇夫  大阪大学, 核物理研究センター, 特任教授 (10089873)

Co-Investigator(Kenkyū-buntansha) 土岐 博  大阪大学, 核物理研究センター, 名誉教授 (70163962)
Project Period (FY) 2011-04-01 – 2016-03-31
Keywordsテンソル力 / 核子移行反応 / 陽子-中性子相関 / 核構造 / 核物質の状態方程式
Outline of Annual Research Achievements

テンソル力の重要性を示すための16O(p, d)15O反応の測定は0度散乱の測定も含めて終了した。これにより以前に発表した論文の結果が、反応機構に影響されずに正しいことが示された。また新しく行った(p,pd)反応の測定では核内の陽子-中性子対が高運動領域ではアイソスピン=0を持っており、=1の成分がないことが判った。これは、高運動量の陽子-中性子対がテンソル力により相関していることと一致している。これらの実験結果は両方ともテンソル力の寄与が16Oの基底状態大きいことを示した。
炭素アイソトープの荷電変化断面積から陽子分布の半径を決定した。この陽子半径と以前から知られている核子分布半径を比較し中性子スキンの厚さを炭素アイソトープで系統的に決定した。これと構造の理論模型を用いることにより中性子過剰核の状態方程式のパラメータを模型依存性はあるが決定出来た。
炭素アイソトープの荷電変化断面積測定データ中に荷電交換(p,n)反応で窒素のアイソトープが作られる反応の断面積が含まれていることが判り、荷電交換反応断面積が決定できた。この断面積とベータ崩壊の遷移強度に強い関連があることを示した。この関係は重い核で成り立つとすると、r-過程などの研究に有効な方法になると思われる。
テンソル力と粒子軌道の関連を知るために軽い核のスペクトロスコピーを進めているが、テンソル力が重要な働きをしていると考えられている11Li核の励起状態の探査を(d,d')と(p,p')反応を用いて行った。(d,d)反応ではアイソスケーラ-の性質を持つ励起状態を観測した。(p,p')反応でもそれとは別の励起状態が観測されその性質について解析を進めている。
「テンソル最適化殻模型」を用いてBe同位体の研究を進め「テンソル最適化反対称化分子動力学」を開発した。この方法ではさらに重い核への適用が可能と考えられる。

Research Progress Status

27年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

27年度が最終年度であるため、記入しない。

  • Research Products

    (29 results)

All 2016 2015 Other

All Int'l Joint Research (3 results) Journal Article (14 results) (of which Int'l Joint Research: 12 results,  Peer Reviewed: 13 results,  Open Access: 6 results,  Acknowledgement Compliant: 6 results) Presentation (11 results) (of which Int'l Joint Research: 11 results,  Invited: 10 results) Funded Workshop (1 results)

  • [Int'l Joint Research] GSI Helmholtzzentrum(Germany)

    • Country Name
      Germany
    • Counterpart Institution
      GSI Helmholtzzentrum
  • [Int'l Joint Research] TRIUMF(Canada)

    • Country Name
      Canada
    • Counterpart Institution
      TRIUMF
  • [Int'l Joint Research] Beihang University/Institute of Modern Physics, Lanzhou(China)

    • Country Name
      China
    • Counterpart Institution
      Beihang University/Institute of Modern Physics, Lanzhou
  • [Journal Article] Observation of Large Enhancement of Charge Exchange Cross sections with Neutron-Rich Carbon Isotopes2016

    • Author(s)
      I. Tanihata et al.
    • Journal Title

      Prog. Theor. and Exp. Physics

      Volume: 043D05 Pages: 1-16

    • DOI

      10.1093/ptep/ptw034

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Nuclear Physics with RIB's: How it all started2016

    • Author(s)
      I. Tanihata
    • Journal Title

      Eur. Phys. J. Plus

      Volume: 131 Pages: 90 (15)

    • DOI

      10.1140/epjp/i2016-16090-x

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Proton Radius of 14Be from Measurement of Charge-Changing Cross sections2015

    • Author(s)
      S. Terashima et al.,
    • Journal Title

      JPS Conference Proceedings

      Volume: 6 Pages: 020027 (7)

    • DOI

      10.7566/JPSCP.6.020027

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Toward precision mass measurement of neutron-rich nuclei relevant to r-process nucleosynthesis2015

    • Author(s)
      B. H. Sun, Yu. A. Litvinov, I. Tanihata, and Y. H. Zhang
    • Journal Title

      Frontier of Physics

      Volume: 10 Pages: 102102

    • DOI

      10.1007/s11467-015-0503-z

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effect of repulsive three-body force in 12C+12C scattering at 100A MeV2015

    • Author(s)
      W.W. Qu et al.
    • Journal Title

      Phys. Rev. Letters B

      Volume: 751 Pages: 1-6

    • DOI

      10.1016/j.physletb.2015.10.008

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Velocity-dependent transverse momentum distribution of fragments produced from 40Ar+9Be at 95 MeV/nucleon2015

    • Author(s)
      S. Momota et al.,
    • Journal Title

      Phys. Rev. C

      Volume: 92 Pages: 024608 (15)

    • DOI

      10.1103/PhysRevC.92.024608

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Evidence of Soft Dipole Resonance in 11Li with Isoscalar Character2015

    • Author(s)
      R. Kanungo et al.,
    • Journal Title

      Phys. Rev. Letters

      Volume: 114 Pages: 192502

    • DOI

      10.1103/PhysRevLett.114.192502

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Structures in 9Be,10Be and 10B studied with tensor-optimized shell model2015

    • Author(s)
      T. Myo, A. Umeda, H. Toki and K. Ikeda
    • Journal Title

      Prog. Theor. and Exp. Physics

      Volume: 063D03 Pages: 1-18

    • DOI

      10.1093/ptep/ptv077

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Tensor-optimized antisymmetrized molecular dynamics in nuclear physics2015

    • Author(s)
      T. Myo, H. Toki, K. Ikeda, H. Horiuchi, and T. Suhara
    • Journal Title

      Prog. Theor. and Exp. Physics

      Volume: 073D02 Pages: 1-38

    • DOI

      10.1093/ptep/ptv087

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Role of tensor force in light nuclei with tensor-optimized shell model2015

    • Author(s)
      T. Myo, A. Umeya, K. Horii, H. Toki, and K. Ikeda
    • Journal Title

      Journal of Physics, Conference Series

      Volume: 569 Pages: 012065(7)

    • DOI

      10.1088/1742-6596/569/1/012065

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Tensor force and delta excitation for the structure of light nuclei2015

    • Author(s)
      K. Horii, T. Myo, and H. Toki
    • Journal Title

      Journal of Physics, Conference Series

      Volume: 569 Pages: 012076(5)

    • DOI

      10.1088/1742-6596/569/1/012076

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Shell and alpha cluster structures in 8Be with tensor-optimized shell model2015

    • Author(s)
      T. Myo, A. Umeda, K. Horii, H. Toki, and K. Ikeda
    • Journal Title

      Prog. Theor. and Exp. Physics

      Volume: 033D01 Pages: 1-20

    • DOI

      10.1093/ptep/ptu012

  • [Journal Article] Dipole polarizability of 120Sn and nuclear energy density functionals2015

    • Author(s)
      Hi, Hashimot et al.,
    • Journal Title

      Phys. Rev. C

      Volume: 92 Pages: 031305(R) (5)

    • DOI

      http://dx.doi.org/10.1103/PhysRevC.92.031305

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Low-energy electric dipole response in 120Sn2015

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

      Phys. Letters B

      Volume: 744 Pages: 7-12

    • DOI

      10.1016/j.physletb.2015.03.023

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] Effect of Tensor Interactions in nuclei2015

    • Author(s)
      I. Tanihata
    • Organizer
      SINP-CUSTIPEN2015
    • Place of Presentation
      Yingyuan hotel, Shaghai, China
    • Year and Date
      2015-12-14 – 2015-12-18
    • Int'l Joint Research / Invited
  • [Presentation] Understanding effect of tensor interactions in light nuclei via high-momentum neutron-transfer reactions2015

    • Author(s)
      H-J. Ong
    • Organizer
      International symposium on High-resolution Spectroscopy and Tensor force
    • Place of Presentation
      Osaka University Nakanoshima Center,Osaka, Japan
    • Year and Date
      2015-11-18 – 2015-11-19
    • Int'l Joint Research / Invited
  • [Presentation] Strong tensor correlation in light nuclei with tensor-optimized antisymmetrized molecular dynamics (TOAMD)2015

    • Author(s)
      T. Myo
    • Organizer
      International symposium on High-resolution Spectroscopy and Tensor force
    • Place of Presentation
      Osaka University Nakanoshima Center,Osaka, Japan
    • Year and Date
      2015-11-18 – 2015-11-19
    • Int'l Joint Research / Invited
  • [Presentation] Nuclear Structure Studies at Beihang University2015

    • Author(s)
      I. Tanihata
    • Organizer
      The 9th Japan-China Joint Nuclear Physics Symposium
    • Place of Presentation
      IchoKaikan, Osaka University, Suita, Japan
    • Year and Date
      2015-11-07 – 2015-11-12
    • Int'l Joint Research / Invited
  • [Presentation] Results from tensor force experiments at RCNP and GSI2015

    • Author(s)
      H. J. Ong
    • Organizer
      NuSTAR week 2015
    • Place of Presentation
      University of Warsaw, Warsaw, Poland
    • Year and Date
      2015-09-27 – 2015-10-01
    • Int'l Joint Research / Invited
  • [Presentation] Role of tensor force in light nuclei studied with tensor-optimized shell model2015

    • Author(s)
      T. Myo
    • Organizer
      YIPQS Long-term and Nishinomiya-Yukawa Memorial International workshop Computational Advances in Nuclear and Hadron Physics
    • Place of Presentation
      Yukawa Institute, Kyoto, Japan
    • Year and Date
      2015-09-21 – 2015-10-30
    • Int'l Joint Research / Invited
  • [Presentation] Possible Study of Tensor Correlations in Nuclei at iThemba2015

    • Author(s)
      I. Tanihata
    • Organizer
      The 3rd China-South Africa Joint Symposium on Nuclear Physics
    • Place of Presentation
      Shandon University, Weihai, China
    • Year and Date
      2015-08-27 – 2015-08-29
    • Int'l Joint Research / Invited
  • [Presentation] How it all started2015

    • Author(s)
      I. Tanhata
    • Organizer
      Rewriting Nuclear Physics textbooks 30 years with Radioactive Ion Beam Physics
    • Place of Presentation
      INFN, Pisa, Italy
    • Year and Date
      2015-07-20 – 2015-07-24
    • Int'l Joint Research / Invited
  • [Presentation] Study on effect of tensor interactions in light nuclei via (p,d) and (p,dN) reactions2015

    • Author(s)
      H. J. Ong
    • Organizer
      2nd International Workshop & 12th RIBF Discussion on Neutron-Proton Correlations
    • Place of Presentation
      University of Hong Kong, Hong Kong
    • Year and Date
      2015-07-07 – 2015-07-09
    • Int'l Joint Research / Invited
  • [Presentation] Importance of tensor force in light nuclei studied with tensor-optimized shell model2015

    • Author(s)
      T. Myo
    • Organizer
      2nd International workshop & 12th RIBF discussion on Neutron-Proton Correlations
    • Place of Presentation
      University of Hong Kong, Honkong, China
    • Year and Date
      2015-07-06 – 2015-07-09
    • Int'l Joint Research
  • [Presentation] Super-FRS Collaboration =Scientific Program=2015

    • Author(s)
      I. Tanihata
    • Organizer
      13th Nordic Meeting of Nuclear Physics
    • Place of Presentation
      Lapland hotel Riekonlinna, Saariselka, Finland
    • Year and Date
      2015-04-13 – 2015-04-17
    • Int'l Joint Research / Invited
  • [Funded Workshop] International Workshop on High-resolution Spectroscopy and Tensor interactions2015

    • Place of Presentation
      Osaka, Japan
    • Year and Date
      2015-11-16 – 2015-11-19

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Published: 2017-01-06  

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