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 11/2 ⊗ vh 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.
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