\begin{document}$ Sp(12,R) $\end{document} dynamical group of the PNSM, which introduces both horizontal and vertical mixings of different \begin{document}$ SU(3) $\end{document} irreducible representations within the \begin{document}$ Sp(12,R) $\end{document} irreducible collective space of 20Ne. A good overall description is obtained for the excitation energies of the ground and first two excited β bands, including the ground state intraband \begin{document}$ B(E2) $\end{document} quadrupole collectivity and the known interband \begin{document}$ B(E2) $\end{document} transition probabilities between the low-lying collective states, without utilizing an effective charge."> Proton-neutron symplectic model description of <sup>20</sup>Ne -
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