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2014 Fiscal Year Annual Research Report

軽い不安定核においてπ中間子が作るテンソル力の働きの解明

Research Project

Project/Area Number 24740175
Research InstitutionOsaka Institute of Technology

Principal Investigator

明 孝之  大阪工業大学, 工学部, 准教授 (20423212)

Project Period (FY) 2012-04-01 – 2015-03-31
Keywords理論核物理 / 核力 / テンソル力 / 不安定核 / テンソル最適化殻模型 / 共鳴 / ハロー構造 / 鏡映対称性
Outline of Annual Research Achievements

【最終年度の成果】1. テンソル最適化殻模型(Tensor optimzied shell model, TOSM)を用いて、核力に基づくBe同位体の構造解析を行った。特に9Beと10Beにおけるテンソル力の働きに注目した。その結果、これらの原子核の基底状態近傍には、テンソル力による結合エネルギーが大きいα粒子(αクラスター)の自由度が重要であることがわかった。一方、高励起状態にはテンソル力の寄与が相対的に小さい一体場的な状態が存在した。これらの特徴は、すでに成果のある8Beとの類似性が顕著であった。すなわちBe同位体においてクラスター的状態と一体場的状態が異なる励起エネルギーで共存することが、核力を用いたTOSMにより示された。2. 複素座標スケーリング法(complex scaling method, CSM)による原子核の共鳴の研究を、最新の成果も含めたレビュー論文にまとめた。不安定核に現れる多体共鳴の構造、中性子ハロー核の分解反応の機構、原子核のエネルギー準位密度における共鳴の寄与などについて、CSMを用いて解析した。

【研究期間全体の成果】1. 核力に基づく原子核の構造解析を、TOSMを用いてp殻核全体に実行した。その結果、TOSMは、軽い核に存在する一体場的な状態を非常によく再現し、予言能力も高いことが示された。一方、α粒子が空間的に発達した分子的なクラスター状態についてはTOSMの不十分さが示され、これを契機にクラスター構造を記述しうる新しい原子核模型の構築を検討した。2. CSMを用いて、不安定核において多粒子崩壊をする共鳴状態の解析を系統的に行った。特に陽子過剰核と中性子過剰核における鏡映対称性に注目し、分光学的因子や半径において、対称性がクーロン力により破れることを予言した。

  • Research Products

    (20 results)

All 2014

All Journal Article (16 results) (of which Peer Reviewed: 15 results,  Open Access: 12 results,  Acknowledgement Compliant: 4 results) Presentation (4 results) (of which Invited: 1 results)

  • [Journal Article] Shell and alpha cluster structures in 8Be with tensor-optimized shell model2014

    • Author(s)
      Takayuki Myo, Atsushi Umeya, Kaori Horii, Hiroshi Toki and Kiyomi Ikeda
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2014 Pages: 033D01

    • DOI

      10.1093/ptep/ptu012

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Decomposition of scattering phase shifts and reaction cross sections using the complex scaling method2014

    • Author(s)
      Myagmarjav Odsuren, Kiyoshi Kato, Masayuki Aikawa and Takayuki Myo
    • Journal Title

      Physical Review C

      Volume: 89 Pages: 034322

    • DOI

      10.1103/PhysRevC.89.034322

    • Peer Reviewed
  • [Journal Article] Resonance and Continuum Contributions for the Scattering Phase Shift2014

    • Author(s)
      Myagmarjav Odsuren, Kiyoshi Kato, Masayuki Aikawa and Takayuki Myo
    • Journal Title

      Japan Physical Society Conference Proceedings

      Volume: 1 Pages: 013061

    • DOI

      10.7566/JPSCP.1.013061

    • Peer Reviewed / Open Access
  • [Journal Article] Mirror symmetry breaking in He isotopes and their mirror nuclei2014

    • Author(s)
      Takayuki Myo, Kiyoshi Kato
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2014 Pages: 083D01

    • DOI

      10.1093/ptep/ptu112

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Double-pole nature of Λ(1405) studied with coupled-channel complex scaling method using complex-range Gaussian basis2014

    • Author(s)
      Akinobu Dote, Takayuki Myo
    • Journal Title

      Nuclear Physics A

      Volume: 930 Pages: 86-103

    • DOI

      10.1016/j.nuclphysa.2014.08.041

    • Peer Reviewed
  • [Journal Article] A new approach for many-body resonance spectroscopy with complex scaling method2014

    • Author(s)
      Takahiro Mizusaki, Takayuki Myo, Kiyoshi Kato
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2014 Pages: 091D01

    • DOI

      10.1093/ptep/ptu124

    • Peer Reviewed / Open Access
  • [Journal Article] Recent development of complex scaling method for many-body resonances and continua in light nuclei2014

    • Author(s)
      Takayuki Myo, Yuma Kikuchi, Hiroshi Masui, Kiyoshi Kato
    • Journal Title

      Progress in Particle and Nuclear Physics

      Volume: 79 Pages: 1-56

    • DOI

      10.1016/j.ppnp.2014.08.001

    • Peer Reviewed
  • [Journal Article] Many-body resonances and continuum states above many-body decay thresholds2014

    • Author(s)
      K. Kato, T. Myo and Y. Kikuchi
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 569 Pages: 012025

    • DOI

      10.1088/1742-6596/569/1/012025

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Mechanism of Coulomb breakup reactions of two-neutron halo nuclei 6He and 11Li2014

    • Author(s)
      Yuma Kikuchi, Takayuki Myo, Kiyoshi Kato and Kiyomi Ikeda
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 569 Pages: 012034

    • DOI

      10.1088/1742-6596/569/1/012034

    • Peer Reviewed / Open Access
  • [Journal Article] Role of tensor force in light nuclei with tensor-optimized shell model2014

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

      Journal of Physics: Conference Series

      Volume: 569 Pages: 012065

    • DOI

      10.1088/1742-6596/569/1/012065

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Effect of tensor interactions in 16O studied via (p,d) reaction2014

    • Author(s)
      H. J. Ong, I. Tanihata, A. Tamii, T. Myo, K. Ogata, M. Fukuda, K. Hirota, K. Ikeda, D. Ishikawa, T. Kawabata, H. Matsubara, K. Matsuta M. Mihara, T. Naito, D. Nishimura, Y Ogawa, A. Ozawa, D. Y. Pang, H. Sakaguchi, K. Sekiguchi, T. Suzuki, M. Taniguchi, M. Takashina, H. Toki, Y. Yasuda, M. Yosoi and J Zenihiro
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 569 Pages: 012066

    • DOI

      10.1088/1742-6596/569/1/012066

    • Peer Reviewed / Open Access
  • [Journal Article] A resonance problem on the low-lying resonant state in the 9Be system2014

    • Author(s)
      Myagmarjav Odsuren, Kiyoshi Kato, Yuma Kikuchi, Masayuki Aikawa and Takayuki Myo
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 569 Pages: 012072

    • DOI

      10.1088/1742-6596/569/1/012072

    • Peer Reviewed / Open Access
  • [Journal Article] Tensor force and delta excitation for the structure of light nuclei2014

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

      Journal of Physics: Conference Series

      Volume: 569 Pages: 012076

    • DOI

      10.1088/1742-6596/569/1/012076

    • Peer Reviewed / Open Access
  • [Journal Article] Essential Kbar cluster "K-pp" studied with a coupled-channel Complex Scaling Method + Feshbach method2014

    • Author(s)
      A. Dote, T. Inoue and T. Myo
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 569 Pages: 012084

    • DOI

      10.1088/1742-6596/569/1/012084

    • Peer Reviewed / Open Access
  • [Journal Article] Tensor force and Delta excitation for the structure of light nuclei2014

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

      Proceedings of the Seventh International Symposium on Chiral Symmetry in Hadrons and Nuclei

      Volume: 1 Pages: 37-40

  • [Journal Article] Evidence of tensor interactions in 16O via (p,d) reaction2014

    • Author(s)
      H.J. Ong, I. Tanihata A. Tamii, T. Myo, K. Ogata, M. Fukuda, K. Hirota, K. Ikeda, D. Ishikawa, T. Kawabata, H. Matsubara, K. Matsuta, M. Mihara, T. Naito, D. Nishimura, Y. Ogawa, H. Okamura, A. Ozawa, D.Y. Pang, H. Sakaguchi, K. Sekiguchi, T. Suzuki, M. Taniguchi, M. Takashina, H. Toki, Y. Yasuda, M. Yosoi, J. Zenihiro
    • Journal Title

      EPJ Web of Conferences

      Volume: 66 Pages: 02076

    • DOI

      10.1051/epjconf/20146602076

    • Peer Reviewed / Open Access
  • [Presentation] テンソル最適化殻模型による軽い核の構造解析2014

    • Author(s)
      明孝之
    • Organizer
      RCNP研究会 QCDを基礎とする核子多体系物理の理解
    • Place of Presentation
      大阪大学核物理研究センター
    • Year and Date
      2014-12-19 – 2014-12-20
  • [Presentation] Role of tensor force in light nuclei studied with tensor-optimized shell model2014

    • Author(s)
      Takayuki
    • Organizer
      International Conference on Cluster structure of unstable nuclei and its decay
    • Place of Presentation
      南京大学, 中国
    • Year and Date
      2014-12-01 – 2014-12-04
  • [Presentation] Role of tensor force in Be isotopes with tensor-optimized shell model2014

    • Author(s)
      Takayuki Myo
    • Organizer
      第4回日米物理学会合同核物理分科会
    • Place of Presentation
      Hilton Waikoloa Village, ハワイ島, アメリカ
    • Year and Date
      2014-10-07 – 2014-10-11
  • [Presentation] Role of tensor force in light nuclei with tensor-optimized shell model2014

    • Author(s)
      Takayuki Myo
    • Organizer
      3rd International Workshop on "State of the Art in Nuclear Cluster Physics" (SOTANCP3)
    • Place of Presentation
      関東学院大学 KGU関内メディアセンター(横浜市)
    • Year and Date
      2014-05-26 – 2014-05-30
    • Invited

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Published: 2016-06-01  

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