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Large-amplitude collective dynamics of shape phase transition in thelow-lying states of 30-36Mg is investigated by solving the five-dimensional(5D) quadrupole collective Schroedinger equation. The collective masses andpotentials of the 5D collective Hamiltonian are microscopically derived withuse of the constrained Hartree-Fock-Bogoliubov plus local quasiparticle RPAmethod. Good agreement with the recent experimental data is obtained for theexcited 0+ states as well as the ground bands. For 30Mg, the shape coexistencepicture that the deformed excited 0+ state coexists with the spherical groundstate approximately holds. On the other hand, large-amplitude quadrupole-shapefluctuations dominate in both the ground and the excited 0+ states in 32Mg, sothat the interpretation of 'coexisting spherical excited 0+ state' based on thenaive inversion picture of the spherical and deformed configurations does nothold.

Shape fluctuations in the ground and excited 0+ states of 30Mg and 32Mg