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Theoretical study of the scattering of unstable nuclei and the synthesis of superheavy elements

Research Project

Project/Area Number 04640280
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 核・宇宙線・素粒子
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

TAKIGAWA Noboru  Tohoku Univ.Fac.of Sciences, Assitant Profressor, 理学部, 助教授 (00125600)

Co-Investigator(Kenkyū-buntansha) SAGAWA Hiroyuki  会津大学, 総合数理センター, 教授 (50178589)
SHINOZUKA Tsutomu  東北大学, サイクロトロンラジオアイソトープセンター, 助手 (10134066)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsHeavy-ion collisions / Unstable nucleus / Halo nucleus / Heavy-ion fusion reactions / Fission / Transport phenomena / Superheavy elements / Quantum tunneling / 暈原核子 / 融合反応 / 弾性散乱 / 分解反応
Research Abstract

This research project aimed at exploring characteristics of heavy-ion collisions induced by unstable nuclei, especially by halo nuclei, and at finding a new way to synthesize superheavy elements. The structure of unstable nuclei and quantum tunneling in multi-dimensional systems were also studied as closely related subjects. The main achievements are as follows. 1. We studied the effect of projectile berak-up on the heavy-ion fusion reactions induced by a halo nucleus, and showed that one can still expect a larger fusion cross section for a halo nucleus than for the other isotopes at energies below the Coulomb barrier, though the projectile break-up moderates the large enhancement of the fusion cross section suggested in one of our previous papers for the collisions of a halo nucleus. 2. We showed that the differential cross section of the elastic scattering in medium energy heavy-ion collisions has a steeper fall off at angles where the so called far-side component dominates if a halo nucleus is used as the projectile. 3. We studied multi-nucleon transfer neactions in deep inelastic heavy-ion collisions based on a transport theory, and found that much larger number of neutrons are exchanged than protons if a halo nucleus is used as the projectile. 4. We showed that the tranverse momentum distribution of the projectile fragments in medium energy heavy-ion collisions gets narrower by reflectiong the reaction mechanism. 5. We studied the effects of environments on the tunneling rate of a macroscoic variable, and showed the importahce of a mass renormalization in the cases, where the environments have slightly shorter time scale than that of the tunneling process. Also, we developed a method, the method of dynamical norm factor, to treat non adiabatic effects in macroscopic quantum tunneling, and demonstrated its numerical accuracy by a few model calculations. Using this method, we analyzed the fission of ^<234>U, and showed that the coupling to a nuclear intrins

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] N.Takigawa: "Role of mass renormalization in adiabatic quantum tunneling" Physical Review C. (in press). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takigawa: "Effect of Breakup Reactions on the Fusion of a Halo Nucleus" Physical Review C. 47. R2470-R2473 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takigawa: "Heavy-ion reactions with neutron-rich beams" Proc.of the Riken Int.Workshop on Heavy-Ion Reactions with Neutron-Rich Beams. 252-263 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Sagawa: "Life Time of Soft Dipole Excitation" Proc.of the Riken Int.Workshop on Heavy-Ion Reactions with Neutron-Rich Beams. 192-203 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takigawa: "Elastic Scattering of a Halo Nucleus at Medium Energies" Physics Letters B. 288. 244-249 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Sagawa: "Sum Rule Study of New Vibrational Modes of Excitation in Halo Nuclei" Nuclear Physics A. 543. 575-588 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takigawa, K.Hagino, M.Abe and A.B.Balantekin: ""Role of mass renormalization in adiabatic quantum tunneling"" Physical Review. C^<DELTA> (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takigawa, M.Kuratani and H.Sagawa: ""Effect of Breakup Reactions on the Fusion of a Halo Nucleus"" Physical Review. C47. 2470-2473 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takigawa, M.Kuratani S.Yoshida, H.Sagawa and M.abe: ""Sub-barrier fusion and transport phenomena in heavy-ion reactions with neutron-rich beams"" Proc.of the Third Int. Conf.on Radioactive Nuclear Beams, ed. D.J.Morrissey (Editions Frontieres, Gif-sur-Yvette). 521-526 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takigawa, M.Ueda, M.Kuratani, and S.Yoshida: ""Heavy-ion reactions with neutron-rich beams"" Proc.of the Riken International Workshop on Heavy-Ion Reactions with Neutron-Rich Beams, eds. N.Takigawa et al., (World Scientific Press, Singapole). 252-263 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Sagawa, Nguyen van Giai, N.Takigawa, M.Ishihara and K.Yazaki: ""Life Time of Soft Dipole Excitation"" Proc.of the Riken International Workshop on Heavy-Ion Reactions with Neutron-Rich Beams, eds. N.Takigawa et al., (World Scientific Press, Singapole). 192-203 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] A.B.Balantekin, J.R.Bennett, N.Takigawa and Y.Alhassid: ""Two-time influence functional approach to multidimensional quantum tunneling"" Jpanese Journal of Applied Physics, Series 9. 90-93 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takigawa, M.Kuratani and H.Sagawa: ""Heavy-ion fusion reactions with a halo nucleus-Large enhancement of the tunneling probability"" Jpanese Journal of Applied Physics, Series 9. 94-97 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takigawa, M.Ueda, M.Kuratani and H.Sagawa: ""Elastic Scattering of a Halo Nucleus at Medium Energies"" Physics Letters. B288. 244-249 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Sagawa, N.Takigawa and Nguyen van Giai: ""Sum Rule Study of New Vibrational Modes of Excitation in Halo Nuclei"" Nuclear Physics. A543. 575-588 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takigawa: "Role of mass renormalization in adiabatic quantum tunneling" Physical Review C. (in press). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] N.Takigawa: "Effect of Breakup Reactions on the Fusion of a Halo Nucleus" Physical Review C. 47. R2470-R2473 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] N.Takigawa: "Heavy-ion reactions with neutron-rich beams" Proc.of the Riken Int.Workshop on Heavy-Ion Reactions with Neutron-Rich Beams. 252-263 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Sagawa: "Life Time of Soft Dipole Excitation" Proc.of the Riken Int.Workshop on Heavy-Ion Reactions with Neutron-Rich Beams. 192-203 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] N.Takigawa: "Heavy-ion fusion reactions with a halo nucleus-Large enhancement of the tunneling probability" Japanese Journal of Applied Physics. 9. 94-97 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] A.B.Balantekin: "Two-time influence functional approach to multidimensional quantum tunneling" Japanese Journal of Applied Physics. 9. 90-93 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] N.Takigawa: "Elastic Scattering of a Halo Nucleus at Medium Energies" Physics Letters B. 288. 244-249 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Sagawa: "Sum Rule Study of New Vibrational Modes of Excitation in Halo Nuclei" Nuclear Physics A. 543. 575-588 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] N.Takigawa: "Heavy-ion fusion reactions with a halo nucleus-Large enhancement of the tunneling probability" Japanese Journal of applied physics.

    • Related Report
      1992 Annual Research Report
  • [Publications] A.B.Balantekin: "Two-time Influence Functional Approach to Multidimensional Quantum Tunneling" Japanese Journal of applied physics.

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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