Abstract
Abstract Both the absolute magnitude and the angular-momentum dependence of electric-dipole (E1) transition probabilities in quadrupole-deformed rare-earth nuclei are investigated in connection with the yrast spectroscopy. It is found that even in the most stable nuclei against octupole deformations the features of the measured E1-transition probabilities are not explained without invoking a coupling to octupole vibrations together with the E1 momentum carried by the octupole modes. The influence of octupole modes with both K π =0 − and 1 − on E1 transitions is discussed.
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