Phase transition at N=92 in 158Dy
Abstract
Beyond the shape phase transition from the spherical vibrator to the deformed rotor regime at N=90, the interplay of β- and γ-degrees of freedom becomes important, which affects the relative positions of the Kπ=0+β- and Kπ=2+γ-bands. In the microscopic approach of the dynamic pairing plus quadrupole model, a correlation of the strength of the quadrupole force and the formation of the β- and γ-bands in 158Dy is described. The role of the potential energy surface is illustrated. The E2 transition rates in the lower three K-bands and the multi-phonon bands with Kπ=0+,2+ and 4+ are well reproduced. The absolute B(E2,2+i=0+2)(i=2,3) serves as a good measure of the quadrupole strength. The role of the single particle Nilsson orbits is also described.
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