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High-spin shape isomers and the nuclear Jahn-Teller effect

  • A. Odahara
  • Y. Wakabayashi
  • T. Fukuchi
  • Y. Gono
  • H. Sagawa
ENAM 2004

Abstract.

High-spin isomers were systematically studied in N = 83 isotones. These isomers are of stretch coupled configurations and have oblate shapes. High-spin isomers can be categorized to be high-spin shape isomer, as they are caused by the sudden shape change from near spherical to an oblate shape. These isomers are considered to be a good example of the nuclear Jahn-Teller effect. By the systematic study of high-spin isomers, several results were obtained, such as (1) change of Z = 64 sub-shell gap energy and (2) experimental pairing gap energy at high-spin states. The Z = 64 sub-shell gap energy was found to decrease from 2.4 to 1.9 MeV as the proton number decreases from 64 to 60. Paring gap energies of high-spin states were experimentally extracted by the three-point expression using binding energies and excitation energies of high-spin isomers. These pairing gap energies at high-spin states are as large as those of the ground states, even though isomers have oblate shapes( β ∼ - 0.19).

PACS.

21.10.-k Properties of nuclei; nuclear energy levels 27.60.+j 90 ⩽ A ⩽ 149 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2005

Authors and Affiliations

  • A. Odahara
    • 1
  • Y. Wakabayashi
    • 2
    • 3
  • T. Fukuchi
    • 3
  • Y. Gono
    • 4
  • H. Sagawa
    • 5
  1. 1.Nishinippon Institute of TechnologyKandaJapan
  2. 2.Department of PhysicsKyushu UniversityHakozakiJapan
  3. 3.Center for Nuclear Study (CNS)University of TokyoWako-shiJapan
  4. 4.RIKENWako-shiJapan
  5. 5.University of AizuAizu-WakamatsuJapan

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