Abstract
Evolution of quadrupole deformations in sd- and pf-shell nuclei with mass $A=18~56$ is studied by using deformed Skyrme Hartree-Fock model with pairing correlations. We point out that the quadrupole deformations of the nuclei with the isospin $T=0$ and $T=1$ show strong mass number dependence as a clear manifestation of dynamical evolution of deformation in nuclear many-body systems. The competition between the deformation driving particle-vibration coupling and the closed-shell structure is shown in a systematic study of the ratios between the proton and neutron deformations in nuclei with $T=|{T}_{z}|=1$. Calculated quadrupole and hexadecapole deformations are compared with shell model results and available experimental data. A relation between the skin thickness and the intrinsic ${Q}_{2}$ moments is also discussed.
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