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2009 Fiscal Year Annual Research Report

弱く束縛された原子核の構造と反応機構の解明

Research Project

Project/Area Number 19740115
Research InstitutionTohoku University

Principal Investigator

萩野 浩一  Tohoku University, 大学院・理学研究科, 准教授 (20335293)

Keywords中性子過剰核 / 対相関 / 電気双極子励起 / 双中性子相関 / ヴァーチャル状態 / 核融合反応 / r-プロセス元素合成 / ベータ崩壊
Research Abstract

本研究の目的は、芯核に多数の中性子が結合した中性子過剰核の構造と反応の機構を明らかにすることである。これに関連し、今年度は以下の研究成果を得た。
1.三体模型を用いてボロミアン原子核^<11>Li及び^6Heの電気双極子励起の構造、特に励起に伴う放出2中性子のエネルギー分布を明らかにした。放出2中性子のエネルギー分布は芯核と外殻中性子からなる2体系の構造を強く反映していること、従って^<11>Li核と^6He核では分布の様子は大きく異なることを明らかにした。また、放出2中性子の角度分布の計算も行い、芯核-外殻中性子間に存在するs波ヴァーチャル状態のため、^<11>Liでは基底状態の強い双中性子相関を角度分布によりプローブできる可能性を指摘した。
2.安定な弱束縛である^6Liと^<198>Ptの核融合反応の実験データの理論解析を行った。極低エネルギーにおける核融合反応断面積及び複合核の平均角運動量の実験データは、研究代表者らが提唱している断熱模型とコンシステントであることを指摘した。
3.r-プロセス元素合成過程で重要となる中性子過剰N=82同中性子核のベータ崩壊率を有限温度乱雑位相近似法を用いて見積もった。r-プロセスのおきている温度では、有限温度効果を無視できることを指摘した。また、簡単な模型を用いて有限温度乱雑位相近似の妥当性を確認した。

  • Research Products

    (23 results)

All 2010 2009

All Journal Article (20 results) (of which Peer Reviewed: 20 results) Presentation (3 results)

  • [Journal Article] Deformation and weak decay of Lambda hypernuclei2010

    • Author(s)
      K.Hagino, Myaing Thi Win, Y.Nakagawa
    • Journal Title

      Proceedings of Sendai International Symposium on Strangeness Nuclear and Hadronic Systems(SENDAI08), Dec.15-18, 2008, Sendai, Japan(World Scientific, 2010)

      Pages: 260-265

    • Peer Reviewed
  • [Journal Article] Deformation of Lambda hypernuclei2010

    • Author(s)
      Myaing Thi Win, K.Hagino
    • Journal Title

      Proceedings of Sendai International Symposium on Strangeness Nuclear and Hadronic Systems (SENDAI08), Dec.15-18, 2008, Sendai, Japan(World Scientific, 2010)

      Pages: 418-419

    • Peer Reviewed
  • [Journal Article] Mesonic decay of neutron-rich Lambda hypernuclei with Skyrme-Hartree-Fock method2010

    • Author(s)
      Y.Nakagawa, K.Hagino
    • Journal Title

      Proceedings of Sendai International Symposium on Strangeness Nuclear and Hadronic Systems(SENDAI08), Dec.15-18, 2008, Sendai, Japan(World Scientific, 2010)

      Pages: 402-403

    • Peer Reviewed
  • [Journal Article] Entrance-channel effects in heavy-ion capture : role of octuple phonons2010

    • Author(s)
      N.Rowley, K.Hagino
    • Journal Title

      Nucl.Phys.A 834

      Pages: 110c-116c

    • Peer Reviewed
  • [Journal Article] Subbarrier fusion reactions with dissipative couplings2010

    • Author(s)
      K.Hagino, S.Yusa, N.Rowley
    • Journal Title

      Nucl.Phys.A 834

      Pages: 135c-138c

    • Peer Reviewed
  • [Journal Article] Hyperons as a probe of nuclear deformation2010

    • Author(s)
      H.-J.Schulze, Myaing Thi Win, K.Hagino, H.Sagawa
    • Journal Title

      Prog.Theo.Phys. 123

      Pages: 569-580

    • Peer Reviewed
  • [Journal Article] Signature of smooth transition from diabatic to adiabatic states in heavy-ion fusion reactions at deep subbarrier energies2009

    • Author(s)
      T.Ichikawa, K.Hagino, A.Iwamoto
    • Journal Title

      Phys.Rev.Lett. 103

      Pages: 202701/1-4

    • Peer Reviewed
  • [Journal Article] Fusion at deep subbarrier energies : potential inversion revisited2009

    • Author(s)
      K.Hagino, N.Rowley
    • Journal Title

      AIP Conf.Proc. 1098

      Pages: 18-25

    • Peer Reviewed
  • [Journal Article] Existence of a one-body barrier revealed in deep subbaarrier fusion2009

    • Author(s)
      T.Ichikawa, K.Hagino, A.Iwamoto
    • Journal Title

      AT Conf.Proc. 1098

      Pages: 32-37

    • Peer Reviewed
  • [Journal Article] Fusion and quasi-elastic scattering around the Coulomb barrier : determination of inter-nucleus potential2009

    • Author(s)
      K.Hagino
    • Journal Title

      AIP Conf.Proc. 1120

      Pages: 3-8

    • Peer Reviewed
  • [Journal Article] Systematic study of the surface properties of the nuclear potential with high precision large-angle quasi-elastic scatterings2009

    • Author(s)
      C.J.Lin, 他7名(8番目)
    • Journal Title

      Phys.Rev.C 79

      Pages: 064603-1-064603-5

    • Peer Reviewed
  • [Journal Article] Two neutron correlations in exotic nuclei2009

    • Author(s)
      H.Sagawa, K.Hagino
    • Journal Title

      AIP Conf.Proc. 1165

      Pages: 110-113

    • Peer Reviewed
  • [Journal Article] Two-particle correlations in continuum dipole transitions in Borromean nuclei2009

    • Author(s)
      K.Hagino, H.Sagawa, T.Na-kamura, S.Shimoura
    • Journal Title

      Phys.Rev.C 80

      Pages: 031301(R)-1-031301(R)-4

    • Peer Reviewed
  • [Journal Article] Test of finite temperature random-phase approximation on a Lipkin model2009

    • Author(s)
      K.Hagino, F.Minato
    • Journal Title

      Phys.Rev.C 80

      Pages: 047301-1-047301-4

    • Peer Reviewed
  • [Journal Article] Effects of weakly coupled channels on quasielastic barrier distributions2009

    • Author(s)
      E.Piasecki, 他26名(26番目)
    • Journal Title

      Phys.Rev.C 80

      Pages: 054613-1-054613-7

    • Peer Reviewed
  • [Journal Article] Fission of heavy Lambda hypernuclei with the Skyrme-Hartree-Fock approach2009

    • Author(s)
      F.Minato, S.Chiba, K.Hagino
    • Journal Title

      Nucl.Phys.A 831

      Pages: 150-162

    • Peer Reviewed
  • [Journal Article] Exploring fusion at extreme sub-barrier energies with weakly bound nuclei2009

    • Author(s)
      A.Shrivastava, 他14名(7番目)
    • Journal Title

      Phys.Rev.Lett. 103

      Pages: 232702-1-232702-4

    • Peer Reviewed
  • [Journal Article] Pairing correlation in unstable nuclei and BCS-BEC crossover2009

    • Author(s)
      H.Sagawa, J.Margueron, K.Hagino
    • Journal Title

      Int.J.of Mod.Phys.E 18

      Pages: 2035-2039

    • Peer Reviewed
  • [Journal Article] Di-neutron correlation in light neutron-rich nuclei2009

    • Author(s)
      K.Hagino, H.Sagawa, P.Schuck
    • Journal Title

      Int.J.of Mod.Phys.E 18

      Pages: 2045-2049

    • Peer Reviewed
  • [Journal Article] beta-decay half-lives at finite temperatures for N=82 isotones2009

    • Author(s)
      F.Minato, K.Hagino
    • Journal Title

      Phys.Rev.C 80

      Pages: 065808-1-065808-7

    • Peer Reviewed
  • [Presentation] Dineutron correlation in the ground state and E1 excitations of Borromean nuclei2010

    • Author(s)
      萩野浩一
    • Organizer
      International Symposium Forefronts of researches in exotic nuclear structure(Niigata2010)
    • Place of Presentation
      新潟県十日町市
    • Year and Date
      2010-03-02
  • [Presentation] Two-particle correlations in continuum dipole transitions in Borromean nuclei2009

    • Author(s)
      萩野浩一
    • Organizer
      第3回日米物理学会合同核物理分科会
    • Place of Presentation
      ハワイ ハワイ島コナ, アメリカ
    • Year and Date
      2009-10-17
  • [Presentation] Subbarrier fusion reactions with dissipative couplings2009

    • Author(s)
      萩野浩一
    • Organizer
      The 10th International Conference on Nucleus-Nucleus Collisions
    • Place of Presentation
      北京, 中国
    • Year and Date
      2009-08-17

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Published: 2011-06-16   Modified: 2016-04-21  

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