The emergent dynamical symmetry at the triple point of nuclear   deformations
  Based on the boson realization of the Euclidean algebras, it is shown that the five-dimensional Euclidean dynamical symmetry may emerge at the triple point of the shape phase diagram of the interacting boson model, which thus offers a symmetry-based understanding of this isolated point. It is further shown that the low-lying dynamics in $^{108}$Pd, $^{134}$Ba, $^{64}$Zn, and $^{114}$Cd may be dominated by the Euclidean dynamical symmetry. 
Yu Zhang, Feng Pan, Yu-xin Liu, Yan-an Luo, and J. P. Draayer
nucl-th