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1997 Fiscal Year Final Research Report Summary

Basic modes in nuclear collective motion

Research Project

Project/Area Number 08044056
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research Field 素粒子・核・宇宙線
Research InstitutionThe University of Tokyo

Principal Investigator

OTSUKA Takaharu  The University of Tokyo, Graduate School of Science Professor, 大学院・理学系研究科, 教授 (20201379)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Nobuaki  Kansai University Faculty of Informatics Professor, 総合情報学部, 教授 (80182773)
MIZUSAKI Takahiro  The University of Tokyo, Graduate School of Science Research Associate, 大学院・理学系研究科, 助手 (50251400)
ARIMA Akito  The Institute of Physical and Chemical Research The Chief Director, 理化学研究所, 理事長 (40011465)
NAKADA Hitoshi  Chiba Unversity Faculty of Science Research Associate, 理学部, 助手 (80221448)
SUGITA Michiaki  Japan Atomic Energy Research Institute researcher, 研究員
Project Period (FY) 1996 – 1997
KeywordsQ-phono / Beta band / gamma band / mixed-symmetry state / Interacting Boson Model / supersymmetry / U(6|4) group / O(6)
Research Abstract

The following outcome has been obtained by this international collaboration involving three major institutions.
1) The Q-phonon scheme originally introduced for even-even nuclei s extended to odd-A nuclei. In particular, the structure of the supersymmetry of U(6|4) has been clarified. To be more precise, eigenstates within the same representation space were shown, in the previous study, to be produced by acting the quadrupole operator of U(6|4) on the ground state of each representation. In the present study, eigenstates are shown to be produced between different representations by utilizing supersymmetric operators. The Q-phonon theory has been extended to other supersymmetric cases like U(6|12) and U(6|20).
2) The so-called beta vibrational state is shown to be a mixture of multi beta-gamma excitations, in particular, that of the beta excitation and double gamma excitation. This trend is found to be consistent with experimental data taken by the Koeln and Yale groups.
3) The mixed symmetry states of 2+ and 3+ are studied by extending the idea of the Q-phonon. Many godd candidates of such states are found by the Koeln group for Mo, Xe, Ba and Pt regions.
4) A possible link between different representations of O(6) is suggested.
5) High spin states sre studied for Xe and Ba isotopes including experimental data from the Koeln group.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] I. Wiedenhover: "2^+ Mixed-Symmetry State in the O(6)-Like Nucleus ^<128>Xe"Phys. Rev. C. 56. R2354-R2357 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N. Yoshida: "IBFM2 Description of Odd Xe and Cs Isotopes"Nucl. Phys. A. 619. 65-87 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Gade: "Non-Yrast States of ^<132>Ce Populated in β-Decay"Nucl. Phys. A. 643. 225-242 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R. V. Jolos: "Supersymmetric Operator for the U(6/4) Dynamical Symmetry"Phys. Lett. B. 430. 1-8 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N. Pietralla: "2_1^+ and 2_2^+ States in Collective Nuclei as Multiple Q-Phonon Excitations"Phys. Rev. C. 57. 150-158 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N. Pietralla: "Symmetry Changing Transitions in γ-Soft Nuclei Studied in the Interacting Boson Moldel"Phys. Rev. C. 58. 191-197 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] I. Wiedenhover: "2ィイD1+ィエD1 Mixed-Symmetry State in the O(6)-Like Nucleus ィイD1128ィエD1Xe"Phys. Rev. C. 56. R2354-R2357 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Yoshida: "IBFM2 Description of Odd Xe and Cs Isotopes"Nucl. Phys. A. 619. 65-87 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A. Gade: "Non-Yrast States of ィイD1132ィエD1Ce populated β-Decay"Nucl. Phys. A. 643. 225-242 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. V. Jolos: "Supersymmetry Operator for the U(6/4) Dynamical Symmetry"Phys. Lett. B. 430. 1-8 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N, Pietralla: "2ィイD21ィエD2+ and 2ィイD22ィエD2+ States in Collective Nuclei as Multiple Q-Phonon Excitations"Phys. Rev. C. 57. 150-158 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Pietralla: "Symmetry Changing Transitions in γ-Soft Nuclei Studied in the Interacting Boson Model"Phys. Rev. C. 58. 191-197 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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