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Macroscopic Quantum Tunneling in Nuclear Reactions and Fission

Research Project

Project/Area Number 06640368
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionTohoki University

Principal Investigator

TAKIGAWA Noboru  Graduate School of Science Tohoki University, Professor, 大学院・理学研究科, 助教授 (00125600)

Co-Investigator(Kenkyū-buntansha) ABE Masanori  Ishinomaki Senshu University, Faculty of Science and Engineering, Lecture, 理工学部, 講師 (50221049)
SINOZUKA Tsutomu  Cyclotron Radioisotope Center Tohoku University, Research associate, 助手 (10134066)
ONO Akira  Graduate School of Science Tohoki University, Research associate, 大学院・理学研究科, 助手 (20281959)
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
KeywordsHeavy-ion Fusion Reactions / Nuclear Fission / Quantum Tunneling / Coupled-channel effects / Surface vibration / rotational motion / anharmonic vibration / higher order effects / 八重極振動 / 相互作用するボゾン模型 / 熱崩壊 / 双相関エネルギー / スクリーニング効果 / 相対論的平均場近似 / 暈原子核 / 前方核力グローリ-散乱 / 重イオン反応 / 不安定核 / 核融合反応 / 原子核の形 / 非断熱効果
Research Abstract

This project has been undertaken with the aim to develop theories and analyze data of macroscopic quantum tunneling in nuclear physics, centering on heavy-ion fusion reactions at energies near and below the Coulomb barrier and fission. Also, studies of related subjects such as elastic heavy-ion scattering, heavy-ion collisions induced by unstable nuclei, astrophysical nuclear reactions, nuclear structure in terms of relativistic mean field theory, medium energy heavy-ion collisions and microcluster physics have been undertaken. The main achievements are as follows : Concerning heavy-ion fusion reactions, we clarified the improtance of higher order coupling effects through the coupled-channels analyzes of the ^<64>Ni+92,96Zr and ^<16>O+^<112>Cd, ^<144>Sm fusion reactions, We also showed the important role playd by the anharmonicity in the vibrational coupling by describing the fusion of ^<16>O+^<112>Cd, ^<144>Sm with the interacting boson model. As an important consequence, our study sh … More ows that fusion data provide very useful information on anharmonic properties of nuclear vibrational modes of excitation and the sign of deformation of nuclei. Concerning the quantum tunneling in systems with many degrees of freedom, we have shown the importance of the mass renormalization in adiabatic quantum tunneling and developed a dissipation factor method to calculate the rate of fast quantum tunneling by taking the effects of a finite excitation energy of the environmental degrees of freedom. We also developed a method, called the dynamical norm method, which can be applied to quantitatively estimating the tunneling rate for a wide range of non-adiabaticity. As for fission, using ^<234>U as an example and using the dynamical norm method we have shown that the life time of spontaneous fission becomes very short due to the existence of nuclear intrinsic degrees of freedom. We also studied the transition of the fission mechanism from quantum tunneling to thermal decay, and have predicted that the fission width gets significantly reduced by the temperature dependence of the pairing cap energies near the critical temperature for the phase transition from superfluid to normal states of nuclei. Less

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (63 results)

All Other

All Publications (63 results)

  • [Publications] N.Takigawa: "“Role of mass renormalization in adiabatic quantum tunneling"" Phys.Rev.C49. 2630-2635 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Sagawa: "“Projectile Fragmentation of Halo Nuclei in Peripheral Reaction Model"" Phys.Rev.C50. 985-990 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Yoshida: "“Structure of Neutron-deficient Pt,Hg and Pb Isotopes"" Phys.Rev.C50. 1398-1403 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.K.Patra: "“Shapes and Superdeformed Configurations in Hg Nuclei in Relativistic Mean Field Model"" Phys.Rev.C50. 1924-1931 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "“Effects of Dissipation and Nonadiabaticity in Heavy-Ion Fusion Reactions and Fission"" Proc.of the International Symposium on Heavy-Ion Fusion:Exploring the variety of nuclear properties(World Scientific). 266-279 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "“Dynamical Norm Method for Non-Adiabatic Macroscopic Quantum Tunneling"" Phys.Rev.C51. 187-197 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "“Path integral approach to no-Coriolis approximation in heavy-ion collisions"" Phys.Rev.C52. 286-290 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "“Reply to“Comment on‘Shape and superdeformed structure in Hg isotopes in relativistic mean field model'and‘Structure of neutron-deficient Pt,Hg and Pb isotopes'""" Phys.Rev.C53. 1038-1040 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Ueda: "“Forward nuclear glory scattering of a halo nucleus"" Nucl.Phys.A598. 273-283 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "“Thermal fission rate around superfluid-normal phaser transition"" Phys.Rev.C53. 1840-1844 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "“Validity of the linear coupling approximation in heavy-ion fusion reactions at subbarrier energies"" Phys.Rev.C55. 276-284 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "“Heavy-Ion Fusion Reactions as Macroscopic Quantum Tunneling"" Prog.Theor.Phys.Supple.124. 1-22 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Tazawa: "“Resonance enhanced Landau Zener Transition"" Nucl.Phys.A583. 291-294 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.K.Patra: "“Hexadecapole shape change in yterrbium isotopes"" Phys.Rev.C51. 2248-2251 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "“Multi-nucleon transfer reactions and fusion with unstable nuclei"" Nucl.Phys.A588. 91c-98c (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Sagawa: "“Life Time of Soft Multipole Excitations"" Z.Physik A. A351. 385-389 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "“Effects of Finite Excitation Energy of Environment on Sudden Quantum Tunneling"" Phys.Rev.C51. 3190-3200 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Yoshida: "“Surface properties of Cs Isotopes"" Phys.Rev.C52. 157-163 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Yoshida: "“Shape dependence of pairing gap energies and the structure of Hg and Pb isotopes"" Phys.Rev.C(in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "“Relativistic Mean Field Studies of Hg and Pb isotopes-Role of pairing interactions"" Proc.of the International Workshop on Physics of Unstable Nuclear Beams,Serra Negra,Aug.28-31,(World Scientific). (in press). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.B.Balantekin: "“Quantum Tunneling in Subbarrier Fusion"" Reviews of Modern Physics. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "“Adiabatic quantum tunneling in heavy-ion sub-barrier fusion"" Submitted to Phys.Rev.Letts.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "“Role of anharmonicities of nuclear vibrations in fusion reactions at subbarrier energies"" submitted to Phys.Rev.Letts.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "“Non-adiabatic effects in electron screening in fusion reactions at astrophysical energies"" submitted to Phys.Rev.C.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "Role of mass renormalization in adiabatic quantum tunneling" Phys.Rev. C49. 2630-2635 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H,Sagawa: "Projectile Fragmentation of Halo Nuclei in Peripheral Reaction Model" Phys.Rev. C50. 985-990 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Yoshida: "Structure of Neutron-deficient Pt, Hg and Pb Isotopes" Phys.Rev. C50. 1398-1403 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.K.Patra: "Shapes and Superdeformed Configurations in Hg Nuclei in Reativistic Mean Field Model" Phys.Rev. C50. 1924-1931 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "Effects of Dissipation and Nonadiabaticity in Heavy-Ion Fusion Reactions and Fission" Proc.of the International Symposium on Heavy-Ion Fusion : Exploring the variety of nuclear properties ( World Scientific). 266-279 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "Dynamical Norm Method for Non-Adiabatic Macroscopic Quantum Tunneling" Phys.Rev. C51. 187-197 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Tazawa: "Resonance enhanced Landau Zener Transition" Nucl.Phys.A583. 291-294 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.K.Patra: "Hexadecapole shape change in yterrbium isotopes" Phys.Rev.C51. 2248-2251 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "Multi-nucleon transfer reactions and fusion with unstable nuclei" Nucl.Phys.A588. 91c-98c (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Sagawa: "Life Time of Soft Multipole Excitaions" Z.Physik A. A351. 385-389 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "Effects of Finite Excitation Energy of Environment on Sudden Quantum Tunneling" Phys.Rev.C51. 3190-3200 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Yohida: "Surface properties of Cs Isotopes" Phys.Rev.C52. 157-163 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "Path integral approach to no-Coriolis approximation in heavy-ion collisions" Phys.Rev.C52. 286-290 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "Reply to "Comment on 'Shape and superdeformed structure in Hg isotopes in relativistic mean field model' and 'Structure of neutron-deficient Pt, Hg and Pb isotopes'"" Phys.Rev. C53. 1038-1040 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Ueda: "Forward nulear glory scattering of a halo nucleus" Nucl.Phys.A598. 273-283 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "Thermal fission rate around superfluid-normal phaser transition" Phys.Rev.C53. 1840-1844 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "Validity of the linear coupling approximation in heavy-ion fusion reactions at subbarrier energies" Phys.Rev.C55. 276-284 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "Heavy-Ion Fusion Reactions as Macroscopic Quantum Tunneling" Prog.Theor.Phys.Supple.124. 1-22 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Yoshida: "Shape dependence of pairing gap energies and the structure of Hg and Pb isotopes" Phys.Rev.C (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] N.Takigawa: "Relativistic Mean Field Studies of Hg and Pb isotopes-Role of pairing interactions" Proc.of the International Workshop on Physics of Unstable Nuclear Beams, Serra Negra, Aug.28-31,1996, (World Scientific). (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.B.Balantekin: "Quantum Tunneling in Subbarrier Fusion" Reviews of Modern Physics. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "Adiabatic quantum tunneling in heavy-ion subbarrier fusion" Phys.Rev.Letts.(submitted to).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "Role of anharmonicities of nuclear vibrations in fusion reactions at subbarrier energies" Phys.Rev.C. (submitted to).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Hagino: "Non-adiabatic effects in electron screening in fusion reactions at astrophysical energies" Phys.Rev.Letts.(submitted to).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K. Hagino: "Thermal fission rate around superfluid-normal phase transition" Physical Review C. 53. 1840-1844 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] K. Hagino: "Validity of the linear coupling approximation in heavy-ion fusion reactions at subbarrier energies" Physical Review C. (in press).

    • Related Report
      1996 Annual Research Report
  • [Publications] N. Takigawa: "Heavy-Ion Fusion Reactions as Macroscopic Quantum Tunneling" Progress of Theoretical Physics Supplement. 124. 1-22 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T. Tazawa: "Resonance enhanced Landav Zener Transition" Nuclear Physics A. 583. 291-294 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] S. K. Patra: "Hexadecapole shape change in ytterbium isotopes" Physical Review C. 51. 2248-2251 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] N. Takigawa: "Multi-nucleon transfer reactions and fusion with unstable nuclet." Nuclear Physics A. 588. 91C-98C (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H. Sagawa: "Life Time of Soft Multipole Excitations" Zeitschrift fur Physik A. 351. 385-389 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] K. Hagino: "Effects of Finite Excitation Energy of Environment on Sudden Quantum Tunneling" Physical Review C. 51. 3190-3200 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] S.Yoshida: "Surface properties of Cs Isotopes" Physical Review C. 52. 157-163 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] N.Takigawa: "Life Time of Soft Multipole Excitations" Z.Physik A. (inpress). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] N.Takigawa: "Dynamical Norm Method for Non-Adiabatic Macroscopic Quantum Tunneling" Physical Review C. 51. 187-197 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] N.Takigawa: "Shapes and Superdeformed Configurations in Hg Nuclei in Relativistic Mean Field Model" Physical Review C. 50. 1924-1931 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] N.Takigawa: "Structure of Neutron-deficient Pt,Hg and Pb Isotopes" Physical Review C. 50. 1398-1403 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] N.Takigawa: "Projectile Fragmentation of Halo Nuclei in Peripheral Reaction Model" Physical Review C. 50. 985-990 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] N.Takigawa: "Role of mass renormalization in adiabatic quantum tunneling" Physical Review C. 49. 2630-2636 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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