Large quadrupole deformation in ${}^{20}$Ne challenges rotor model and modern theory: urging for $\alpha$ clusters in nuclei

C. V. Mehl, J. N. Orce, C. Ngwetsheni +31

The spectroscopic quadrupole moment of the first excited state, $Q_{{}_S}(2_1^{+})$, at 1.634 MeV in ${}^{20}$Ne was determined from sensitive reorientation-effect Coulomb-excitation…