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ハイペロンのもたらす不純物効果の解明とその核構造研究への応用

Research Project

Project/Area Number 11J06937
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field 素粒子・原子核・宇宙線・宇宙物理(理論)
Research InstitutionHokkaido University

Principal Investigator

井坂 政裕  北海道大学, 大学院・理学院, 特別研究員(DC2)

Project Period (FY) 2011 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2012: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2011: ¥700,000 (Direct Cost: ¥700,000)
Keywordsハイパー核 / ラムダハイパー核 / ストレンジネス / 原子核構造
Research Abstract

原子核にΛ粒子等のハイペロンを加えることで,核構造が変化することが知られている(不純物効果)。さらに,Λ粒子が加わった原子核(ハイパー核)の構造を調べることで,Λ粒子をプローブとして元の核の構造を明らかにすることが可能である。本研究の目的は,ハイペロンによる不純物効果を明らかにすると共に,ハイパー核構造から元の核の構造・性質を解明することである。
1.Λ粒子をプローブとしたMg核の三軸非対称変形の解明
24Mgは三軸非対称変形核の候補であると長年考えられている。しかし,原子核の三軸非対称変形を実験で直接確かめることは容易ではない。そこで本研究では,25ΛMg(24Mg+Λ)ハイパー核構造の理論的予言を行い,Λ粒子をプローブとして芯核24Mgの三軸非対称変形を確かめることが可能であることを示した。具体的には,25ΛMgのp軌道状態(一粒子軌道がp軌道に励起したΛ粒子が24Mgに加わった状態)に着目し,24Mgの三軸非対称変形のためp軌道状態がΛ粒子の軌道の方向によって3つに分裂することを示した。
2.Be同位体におけるΛ粒子による核構造変化
Be同位体は2αクラスター構造を持ち,中性子数によって2α構造が変化することが知られている。そのため,Λ粒子によって核構造の大きな変化が起こると期待できる。実際、これまでの我々の研究で、12ΛBeでは,Λ粒子が加わることで基底状態のパリティが反転することを示してきた。本年度は,Be同位体におけるΛ粒子による核構造の変化を解明するため,12ΛBeに引き続き10ΛBeに着目し,Λ粒子が加わることで,第一励起状態1/2+の励起エネルギーが高くなることを理論的に示した。これは,基底状態3/2-と1/2+状態では2αクラスター構造の発達度合が異なるため原子核の変形が異なり,Λ粒子の束縛エネルギーが異なることが原因であることを明らかにした。

Report

(2 results)
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (26 results)

All 2013 2012 2011

All Journal Article (7 results) (of which Peer Reviewed: 6 results) Presentation (19 results)

  • [Journal Article] Structure of Neutron-Rich Be Hyper Isotopes2013

    • Author(s)
      Masahiro Isaka
    • Journal Title

      Few-Body systems

      Volume: 54 Issue: 1-4 Pages: 395-398

    • DOI

      10.1007/s00601-012-0398-y

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Splitting of the p orbit in triaxially deformed 25 ΛMg2013

    • Author(s)
      Masahiro Isaka
    • Journal Title

      Physical Review C

      Volume: 87 Issue: 2

    • DOI

      10.1103/physrevc.87.021304

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Modification of triaxial deformation and change of spectrum in 25ΛMg caused by the Λ hyperon2012

    • Author(s)
      Masahiro Isaka
    • Journal Title

      Physical Review C

      Volume: 85 Issue: 3 Pages: 0343031-8

    • DOI

      10.1103/physrevc.85.034303

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Excitation and Structure Change of 24Mg.I-Triaxial Deformed Mean Field in Low-Lying Stales-2012

    • Author(s)
      Masaaki Kimura
    • Journal Title

      Progress of Theoretical Physics

      Volume: 127 Issue: 2 Pages: 287-301

    • DOI

      10.1143/ptp.127.287

    • NAID

      110009418653

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Deformation of hypernuclei studied with antisymmetrized molecular dynamics2011

    • Author(s)
      Masahiro Isaka
    • Journal Title

      Physical Review C

      Volume: 83 Issue: 4 Pages: 0443231-6

    • DOI

      10.1103/physrevc.83.044323

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Shell and cluster states of 21ΛNe studied with antisymmetrized molecular dynamics2011

    • Author(s)
      Masahiro Isaka
    • Journal Title

      Physical Review C

      Volume: 83 Issue: 5 Pages: 0543041-8

    • DOI

      10.1103/physrevc.83.054304

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Impurity effects in 12ΛBe and 21ΛNe hypernuclei2011

    • Author(s)
      Masahiro Isaka
    • Journal Title

      International Journal of Modern Physics E

      Volume: 20 Issue: 04 Pages: 859-862

    • DOI

      10.1142/s0218301311018848

    • Related Report
      2011 Annual Research Report
  • [Presentation] Structure of p-sd shell Λ hypernuclei modified and probed by Λ hyperon2013

    • Author(s)
      Masahiro Isaka
    • Organizer
      Workshop on 'Hypernuclear physics with Electromagnetic Probes'
    • Place of Presentation
      理化学研究所(埼玉県)
    • Year and Date
      2013-02-27
    • Related Report
      2012 Annual Research Report
  • [Presentation] Structure of triaxially deformed hypernucleus 25 ΛMg2013

    • Author(s)
      Masahiro Isaka
    • Organizer
      Workshop on Future Prospects of Hadron Physics at J-PARC and Large Scale Computational Physics in 2013
    • Place of Presentation
      いばらき量子ビーム研究センター(茨城県)
    • Year and Date
      2013-02-11
    • Related Report
      2012 Annual Research Report
  • [Presentation] Structure of p-sd shell Λ hypernuclei studied with antisymmetrized molecular dynamics2013

    • Author(s)
      Masahiro Isaka
    • Organizer
      YITP molecule-type workshop "Nuclear equation of state and hypernuclear physics"
    • Place of Presentation
      京都大学(京都市)
    • Year and Date
      2013-01-07
    • Related Report
      2012 Annual Research Report
  • [Presentation] Excited states with Λ hyperon in p orbit in triaxially deformed 25ΛMg2012

    • Author(s)
      Masahiro Isaka
    • Organizer
      XI International Conference on Hypernuclear and Strange Particle Physics (HYP2012)
    • Place of Presentation
      Cosmocaixa(スペイン)
    • Year and Date
      2012-10-01
    • Related Report
      2012 Annual Research Report
  • [Presentation] Structure of Be hyper isotopes2012

    • Author(s)
      Masahiro Isaka
    • Organizer
      10th International Conference on Clustering Aspects of Nuclear Structure and Dynamics (CLUSTER12)
    • Place of Presentation
      KXslcsey Convention Centre(ハンガリー)
    • Year and Date
      2012-09-26
    • Related Report
      2012 Annual Research Report
  • [Presentation] AMDによるBeバイパー同位体の構造研究2012

    • Author(s)
      井坂政裕
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      京都産業大学(京都市)
    • Year and Date
      2012-09-12
    • Related Report
      2012 Annual Research Report
  • [Presentation] Excited states with A hyperon in p orbit in triaxially deformed 25ΛMg2012

    • Author(s)
      Masahiro Isaka
    • Organizer
      International Workshop on Strangeness Nuclear Physics 2012 (SNP12)
    • Place of Presentation
      大阪電通大学(寝屋川市)
    • Year and Date
      2012-08-27
    • Related Report
      2012 Annual Research Report
  • [Presentation] Structure of Be hyper isotopes2012

    • Author(s)
      Masahiro Isaka
    • Organizer
      The 20th International IUPAP Conference on Few-Body Problems in Physics (FB20)
    • Place of Presentation
      福岡国際会議場(福岡県)
    • Year and Date
      2012-08-21
    • Related Report
      2012 Annual Research Report
  • [Presentation] Excited states with Λ hyperon in p orbit in triaxially deformed 25ΛMg2012

    • Author(s)
      Masahiro Isaka
    • Organizer
      The 20th International IUPAP Conference on Few-Body Problems in Physics (FB20)
    • Place of Presentation
      福岡国際会議場(福岡県)
    • Year and Date
      2012-08-21
    • Related Report
      2012 Annual Research Report
  • [Presentation] 25ΛMgにおけるΛ粒子のp軌道状態の分析2012

    • Author(s)
      井坂政裕
    • Organizer
      「ストレンジネス核の励起スペクトルとバリオン混合」第2回ミーティング
    • Place of Presentation
      高エネルギー加速器研究機構東海キャンパス(茨城県)
    • Year and Date
      2012-08-03
    • Related Report
      2012 Annual Research Report
  • [Presentation] 25ΛMgにおけるΛ粒子のp軌道状態の分析2012

    • Author(s)
      井坂政裕
    • Organizer
      日本物理学会第67回年次大会
    • Place of Presentation
      関西学院大学(西宮市)(発表確定)
    • Year and Date
      2012-03-25
    • Related Report
      2011 Annual Research Report
  • [Presentation] Impurity effects in sd-shell and neutronr-rich Λ hypernuclei2012

    • Author(s)
      Masahiro Isaka
    • Organizer
      First International School for strangeness Nuclear
    • Place of Presentation
      茨城量子ビーム研究センター(茨城県東海村)
    • Year and Date
      2012-02-14
    • Related Report
      2011 Annual Research Report
  • [Presentation] Possible structure change and exotic structure of sd-shell and neutron-rich Λ hypernuclei2012

    • Author(s)
      Masahiro Isaka
    • Organizer
      Future Prospects of Hadron Physics at J-PARC and Large Scale Computational Physics
    • Place of Presentation
      茨城量子ビーム研究センター(茨城県東海村)
    • Year and Date
      2012-02-10
    • Related Report
      2011 Annual Research Report
  • [Presentation] Low-lying structure of p-sd shell and neutron-rich Λ hypernuclei2012

    • Author(s)
      Masahiro Isaka
    • Organizer
      Mini-Workshop on strangeness nuclear physics
    • Place of Presentation
      理化学研究所(和光市)
    • Year and Date
      2012-02-07
    • Related Report
      2011 Annual Research Report
  • [Presentation] Analysis for the structure of 25ΛMg hypernucleus with AMD+GCM2011

    • Author(s)
      井坂政裕
    • Organizer
      第24回北海道原予核理論グループ研究会
    • Place of Presentation
      北海道大学(札幌市)
    • Year and Date
      2011-11-20
    • Related Report
      2011 Annual Research Report
  • [Presentation] Impurity effects in p-sd shell and neutron-rich Λ hypernuclei2011

    • Author(s)
      Masahiro Isaka
    • Organizer
      Korea-Japan workshop on nuclear and hadron physics at J-PARC
    • Place of Presentation
      ソウル大学校(韓国)
    • Year and Date
      2011-09-23
    • Related Report
      2011 Annual Research Report
  • [Presentation] AMD+GCMを用いた25ΛMgハイパー核構造の分析2011

    • Author(s)
      井坂政裕
    • Organizer
      日本物理学会2011年秋季大会
    • Place of Presentation
      弘前大学(弘前市)
    • Year and Date
      2011-09-18
    • Related Report
      2011 Annual Research Report
  • [Presentation] 12ΛBeの基底状態におけるパリティ再逆転2011

    • Author(s)
      本間裕明
    • Organizer
      日本物理学会2011年秋季大会
    • Place of Presentation
      弘前大学(弘前市)
    • Year and Date
      2011-09-18
    • Related Report
      2011 Annual Research Report
  • [Presentation] Structure of neutron-rich Be hyper isotopes2011

    • Author(s)
      Masahiro Isaka
    • Organizer
      The Fifth Asia-Pasific Conference on Few-Body Problems in Physics 2011 (APFB2011)
    • Place of Presentation
      成均館大学校(韓国)
    • Year and Date
      2011-08-23
    • Related Report
      2011 Annual Research Report

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Published: 2011-12-12   Modified: 2024-03-26  

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