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The influence of the quadrupole shape fluctuations on the dipole vibrationsin transitional nuclei is investigated in the framework of the InstantaneousShape Sampling Model, which combines the Interacting Boson Model for the slowcollective quadrupole motion with the Random Phase Approximation for the rapiddipole vibrations. Coupling to the complex background configurations is takeninto account by folding the results with a Lorentzian with an energy dependentwidth. The low-energy energy portion of the $\gamma$- absorption cross section,which is important for photo-nuclear processes, is studied for the isotopicseries of Kr, Xe, Ba, and Sm. The experimental cross sections are wellreproduced. The low-energy cross section is determined by the Landaufragmentation of the dipole strength and its redistribution caused by the shapefluctuations. Collisional damping only wipes out fluctuations of the absorptioncross section, generating the smooth energy dependence observed in experiment.In the case of semi-magic nuclei, shallow pygmy resonances are found inagreement with experiment.

Instantaneous Shape Sampling - a model for the $\gamma$-absorption cross section of transitional nuclei