New Structure Problems in Carbon and Neon Isotopes

Structure of Carbon and Neon isotopes are investigated by deformed Skyrme Hartree-Fock and shell model calculations. We point out that the quadrupole deformations of C-isotopes have a strong isotope dependence as a manifestation of nuclear Jahn-Teller effect. It is shown also that the quadrupole moments and the magnetic moments of the odd C isotopes depend clearly on assigned configurations, and their experimental data will be useful to determine the spin-parities and the deformations of the ground states of these nuclei. The electric quadrupole (E2) transitions in even C and Ne isotopes are also studied. The isotope dependence of the E2 transition strength is reproduced properly, although the calculated strength overestimates extremely small observed value in ¹⁶C.