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不安定核における特異な殻構造とその核構造との関係

Research Project

Project/Area Number 17740165
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

宇都野 穣  Japan Atomic Energy Agency, 先端基礎研究センター, 研究職 (10343930)

Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2007: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000)
Keywords不安定核 / 殻構造 / 殻模型 / テンソルカ / スペクトロスコピック因子 / テンソル力 / 魔法数 / 有効相互作用 / 核構造
Research Abstract

sd-pf殻模型空間の殻模型相互作用の構築をほぼ完成させた。前年度では適切なテンソルカを入れることにより、球形一粒子エネルギーと^<42>Siで最近発見された変形をよく記述することがわかったが、今年度はガウス型中心力を採用することで、中心力部分もより適切な相互作用を用いる改善がなされた。それによって、中心力部分の不定性が除去され、殻構造の変化とテンソルカの関係が非常にはっきりとした形で取り出すことに成功した。
この新たな殻模型相互作用を用いて、より詳細な核構造、特にスペクトロスコピック因子の研究に着手した。この研究では、ミシガン州立大学のブラウン教授とともに新たな殻模型コードNuShellを採用し、その目的に合うようにコードを発展させた。中性子数28近傍の核構造計算を行った結果、48Caの陽子空孔状態のようなこれまで知られている核のスペクトルスコピック因子を実験の知られている高励起状態まできれいに再現できること、47Arで見られる急激なスピン軌道力の変化の要因は、実際は模型空間内の相関によるものが大きく、一粒子エネルギーからの寄与は小さいこと、など多数の現象を理解した。
一連の殻模型計算は、ミシガン州立大学でなされている不安定核の実験の共同研究にも適用された。今年度は特に、36Mgにおける"island of inversion"の拡大、30Naにおける通常・侵入者状態の競合、34Alの磁気モーメントと侵入者状態の混合なとの研究で論文が出版された。

Report

(3 results)
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (20 results)

All 2008 2007 2006 2005

All Journal Article (16 results) (of which Peer Reviewed: 6 results) Presentation (4 results)

  • [Journal Article] g factor of the exotic N=21 isotope ^<34>Al: probing the N=20 and N=28 shell gaps at the boundary of the "island of inversion"2008

    • Author(s)
      P. Himpe, et. al.
    • Journal Title

      Physical Letters B 658

      Pages: 203-208

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Single-neutron knockout from intermediate energy beams of 30, 32Mg:"mapping the transition into the"island of inversion"2008

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

      Physical Review C 77

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Excited intruder states in ^<32>Mg2008

    • Author(s)
      V. Tripathi, et. al.
    • Journal Title

      Physical Review C 77

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Structure of unstable nuclei in the sd-pf shell by shell model with proper tensor force2007

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

      European Physical Journal Special Topics 150

      Pages: 187-188

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Competition between normal and intruder states inside the"island of inversion"2007

    • Author(s)
      V. Tripathi, et. al.
    • Journal Title

      Physical Review C 76

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spectroscopy of 6<36>Mg: Interplay of normal and intruder configurations at the neutron-rich boundary of the "island of inversion"2007

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

      Physical Review Letters 99

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Beta-delayed gamma spectroscopy of neutron-rich ^<27, 28, 29>Na2006

    • Author(s)
      V.Tripathi et al.
    • Journal Title

      Physical Review C 73

      Pages: 54303-54303

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Measurement of the spin and magnetic moment of ^<23>Al2006

    • Author(s)
      A.Ozawa et al.
    • Journal Title

      Physical Review C 74

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Direct evidence for the onset of intruder configurations2006

    • Author(s)
      J.R.Terry et al.
    • Journal Title

      Physics Letters B 640

      Pages: 86-86

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Structure of exotic nuclei in the sd-pf shell region and its relation to the effective interaction2006

    • Author(s)
      Y.Utsuno et al.
    • Journal Title

      Journal of Physics : Conference Series 49

      Pages: 126-126

    • Related Report
      2006 Annual Research Report
  • [Journal Article] High spin structure and intruder configurations in ^<31>P2006

    • Author(s)
      M.Ionescu-Bujor et al.
    • Journal Title

      Physical Review C Vol.73,No.2

    • Related Report
      2005 Annual Research Report
  • [Journal Article] ^<29>Na : Defining the Edge of the Island of Inversion for Z=112005

    • Author(s)
      V.Tripathi et al.
    • Journal Title

      Physical Review Letters Vol.94,No.16

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Anomalous magnetic moment of ^9C and shell quenching in exotic nuclei2005

    • Author(s)
      Y.Utsuno
    • Journal Title

      European Physical Journal A Vol 25,Suppl.1

      Pages: 209-212

    • NAID

      120006684011

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Shape coexistence and mixing in N~20 region2005

    • Author(s)
      Y.Utsuno et al.
    • Journal Title

      Journal of Physics : Conference Series Vol.20

      Pages: 167-168

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Gamow-Teller decay of the T = 1 nucleus ^<46>Cr2005

    • Author(s)
      T.K.Onishi et al.
    • Journal Title

      Physical Review C Vol.72,No.2

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Search for neutron excitations across the N=20 shell gap in ^<25-29>Ne2005

    • Author(s)
      M.Belleguic et al.
    • Journal Title

      Physical Review C Vol.72,No.5

    • Related Report
      2005 Annual Research Report
  • [Presentation] Large-scale shell model calculation for exotic nuclei-collaboration between Japan and US2008

    • Author(s)
      Y. Utsuno
    • Organizer
      The 2nd LACM-EFES-JUSTIPEN Workshop
    • Place of Presentation
      オークリッジ、米国
    • Related Report
      2007 Annual Research Report
  • [Presentation] Exploring the single-particle structure in the exotic sd-pf shell region with a new effective interaction2008

    • Author(s)
      Y. Utsuno
    • Organizer
      Workshop on Future Prospects for Spectroscopy and Direct Reactions 2008
    • Place of Presentation
      イーストランシング、米国
    • Related Report
      2007 Annual Research Report
  • [Presentation] Shell evolution and structure of unstable nuclei in the sd-pf shell region2007

    • Author(s)
      Y. Utsuno
    • Organizer
      ECT* Workshop "Advanced Many-Body Methods for Nuclear Physics"
    • Place of Presentation
      イタリア、トレント
    • Related Report
      2007 Annual Research Report
  • [Presentation] Role of shell evolution in the structure of exotic nuclei in the sd-pf shell2007

    • Author(s)
      Y. Utsuno
    • Organizer
      Workshop at the INT Fall-07 Program on Correlations in Nuclei: From Di-neutrons to Clusters
    • Place of Presentation
      シアトル、米国
    • Related Report
      2007 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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