Abstract
The recent shell-model results of even-even chains of nuclei: $^{134,136,138}\mathrm{Te},^{136,138,140}\mathrm{Xe},^{138,140,142}\mathrm{Ba},^{140,142,144}\mathrm{Ce}$, and $^{142,144,146}\mathrm{Nd}$ are explored in this manuscript. The low-lying states energies, E2 and M1 transitions, are investigated using the $same$ effective interaction based on the realistic effective field theory potential N3LO. Significant quadrupole correlations appear in the $N=86$ isotonic chain, with the signature of nonaxial $\ensuremath{\gamma}\phantom{\rule{0.28em}{0ex}}\mathrm{band}$. This class of collectivity is interpreted within the SU(3) symmetries scheme and confirmed by constrained Hartree-Fock shell-model calculations.
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