Systematic analysis of deformations in neutron-rich $N=14$ isotones was done based on the method of antisymmetrized molecular dynamics. The property of the shape coexistence in ${}^{28}\mathrm{Si}$, which is known to have the oblate ground state and the prolate excited states, was successfully described. The results suggest that the shape coexistence may occur also in neutron-rich $N=14$ nuclei as well as ${}^{28}\mathrm{Si}$. It was found that the oblate neutron shapes are favored because of the spin-orbit force in most of $N=14$ isotones. $Q$ moments and $E2$ transition strengths in the neutron-rich nuclei were discussed in relation to the intrinsic deformations, and a possible difference between the proton and neutron deformations in ${}^{24}\mathrm{Ne}$ was proposed.

• Received 23 September 2004

DOI:https://doi.org/10.1103/PhysRevC.71.014303