Spin-dependent $γ$ softness or triaxiality in even-even $^{132-138}$Nd nuclei

The properties of $γ$ instability in rapidly rotating even-even $^{132-138}$Nd isotopes have been investigated using the pairing-deformation self-consistent total-Routhian-surface calculations in a deformation space of ($β_2, γ, β_4$). It is found that even-even $^{134-138}$Nd nuclei exhibit the triaxiality in both ground and excited states, even up to high-spin ones. The lightest isotope possesses a well-deformed prolate shape without $γ$ deformation component. The current numerical results are compared with previous calculations and available observables, showing basically a general agreement with the observed trend of $γ$ correlations. The existing differences between theory and experiment are analyzed and discussed briefly.

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