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We study the oblate-prolate shape mixing in the low-lying states ofproton-rich Kr isotopes using the five-dimensional quadrupole collectiveHamiltonian. The collective Hamiltonian is derived microscopically by means ofthe CHFB (constrained Hartree-Fock-Bogoliubov) + Local QRPA (quasiparticlerandom phase approximation) method, which we have developed recently on thebasis of the adiabatic self-consistent collective coordinate method. Theresults of the numerical calculation show the importance of large-amplitudecollective vibrations in the triaxial shape degree of freedom and rotationaleffects on the oblate-prolate shape mixing dynamics in the low-lying states ofthese isotopes.

Shape mixing dynamics in the low-lying states of proton-rich Kr isotopes