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Research of electromagnetic transitions and beta decays of unstable nuclei

Research Project

Project/Area Number 13640262
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 InstitutionSaitama University

Principal Investigator

YOSHINAGA Naotaka  Saitama University, Faculty of Science, Professor, 理学部, 教授 (00192427)

Co-Investigator(Kenkyū-buntansha) 田辺 孝哉  埼玉大学, 理学部, 教授 (00008905)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
KeywordsNuclear Structure / Unstable nuclei / Electromagnetic transitions / Beta decay / Shell model / Pair model / 奇核 / ペア近似
Research Abstract

In the mass region around 130, interesting phenomena are found such as high-spin isomers, backbending phenomena, triaxial deformation, chiral bands. Moreover, these nuclei provide necessary information concerning the abundance of species which are made in supernovae explosions. The nuclei treated in this research are neither vibrational nor rotational nuclei, thus cannot be described in terms of mean field theories. We describe them in terms of the pair-truncated model which assumes angular momentum 0 and 2 collective pairs. In ^<132>Ba we have successfully reproduced ground state band, quasi-gamma band, and states in backbending region. The backbending is confirmed to be caused by the alignment of neutrons due to the magnetic dipole moment of 10^+ state. The similar study has been done for Xe isotopes, predicting the 10+ isomer just above the 8^+ state. In ^<132>La, the chiral band is predicted theoretically. However, we have predicted that two angular momenta by neutrons and protons are rather parallel than orthogonal. As a preliminary calculation, we have shown that our model has a predictive power for the beta decays as well.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] K.Enami: "Generator coordinate method combined with exact triaxial spin projection"Physical Review C. 63. 044322-044335 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Enami: "Capability of the GCM calculation with spin and particle number projections for single-j shell model"Prog.Part.Nucl.Phys.. 46. 177-186 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Enami: "Quantum-number-projected generator coordinate method : Pairing plus quadrupole model within a single-j shell"Physical Review C. 64. 044305-044318 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Higashiyama: "Shell model study of backbending phenomena in Xe isotopes"Physical Review C. 65. 054317-054325 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Enami: "Quantum-number-projected generator coordinate method and the shell model"Physical Review C. 65. 064308-064322 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Enami: "Quantum-number-projected generator coordinate method analysis of low-lying states in ^<130,132>Xe"Physical Review C. 66. 047301-047305 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Enami, K.Tanabe, N. Yoshinaga: "Generator coordinate method combined with exact triaxial spin projection"Physical Review. C63. 044322-1-13 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Enami, K.Tanabe, N. Yoshinaga: "Capability of the GCM calculation with spin and particle number projections for single-j shell model"Prog. Part. Nucl. Phys.. 46. 177-186 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Enami, K.Tanabe, N. Yoshinaga: "Quantum-number-projected generator coordinate method : pairing plus quadrapole model within a single-j shell"Physical Review. C64. 044305-1-13 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Higashiyama, N. Yoshinaga, K.Tanabe,: "Shell model study of backbending phenomena in Xe isotopes"Physical Review. C65. 054317-1-8 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Enami, K.Tanabe, N. Yoshinaga: "Quantum-number-projected generator coordinate method and the shell model"Physical Review. C65. 064308-1-14 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Enami, K.Higashiyama, K.Tanabe, N. Yoshinaga: "Quantum-number-projected generator coordinate method analysis of low-lying states ^<130,132>Xe"Physical Review. C66. 047301-1-4 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Enami: "Quantum-number-projected generator coordinate"Physical Review C. 65. 064308-14 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Higashiyama: "Shell model study of backbending phenomena in Xe"Physical Review C. 65. 054317-8 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Enami: "Quantum-number-projected generator coordinate method"Physical Review C. 66. 047301-4 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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