High-Spin Properties of Doubly-Odd Nuclei of Mass ≈130

  • E. S. Paul
  • C. W. Beausang
  • D. B. Fossan
  • Y. Liang
  • R. Ma
  • W. F. PielJr.
  • S. Shi
  • N. Xu

Abstract

Light rare-earth nuclei of mass A ≈ 130 are predicted to possess relatively flat potential-energy surfaces with respect to γ, the asymmetry parameter in the polar representation of rotating quadrupole shapes. Because of this γ softness, valence nucleons in high-j orbitals can greatly modify the nuclear shape. Whereas protons from the bottom of the h 11/2 subshell maintain the nuclear core near the collective prolate shape, γ = 0°, valence neutrons from the top of the h 11/2 subshell drive the nuclear core towards the collective oblate shape, γ = 60°. Such competition between the shape-driving forces of the valence nucleons makes the study of doubly-odd nuclei most interesting. Triaxial yrast bands built on the πh 11/2vh 11/2 configuration have systematically been observed in isotopes ranging from Cs to Eu (55 ≤ Z ≤ 63). The characteristic features of these bands will be discussed and their properties compared to theoretical expectations.

Keywords

Prolate Bala Kirwan 

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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • E. S. Paul
    • 1
  • C. W. Beausang
    • 1
  • D. B. Fossan
    • 1
  • Y. Liang
    • 1
  • R. Ma
    • 1
  • W. F. PielJr.
    • 1
  • S. Shi
    • 1
  • N. Xu
    • 1
  1. 1.State University of New York at Stony BrookStony BrookUSA

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