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[Background] Photon strength functions are an important ingredient incalculations relevant for the nucleosynthesis of heavy elements. The relationto the photoabsorption cross section allows to experimentally constrain photonstrength functions by investigating the photo-response of atomic nuclei.[Purpose] We determine the photoresponse of $^{66}$Zn in the energy region of5.6 MeV to 9.9 MeV and analyze the contribution of the "elastic" decay channelback to the ground state. In addition, for the elastic channel electric andmagnetic dipole transitions were separated. [Methods] Nuclear resonancefluorescence experiments were performed using a linearly-polarizedquasi-monoenergetic photon beam at the High Intensity $\gamma$-ray Source.Photon beam energies from 5.6 to 9.9 MeV with an energy spread of about 3% wereselected in steps of 200-300 keV. Two High Purity Germanium detectors were usedfor the subsequent $\gamma$-ray spectroscopy. [Results] Full photoabsorptioncross sections are extracted from the data making use of the monoenergeticcharacter of the photon beam. For the ground-state decay channel, the averagecontribution of electric and magnetic dipole strengths is disentangled. Theaverage branching ratio back to the ground state is determined as well.[Conclusions] The new results indicate lower cross sections when compared tothe values extracted from a former experiment using bremsstrahlung on$^{66}$Zn. In the latter, the average branching ratio to the ground state isestimated from statistical-model calculations in order to analyze the data.Corresponding estimates from statistical-model calculations underestimate thisbranching ratio compared to the values extracted from the present analysis,which would partly explain the high cross sections determined from thebremsstrahlung data.

Model-independent determination of the dipole response of $^{66}$Zn using quasi-monoenergetic and linearly-polarized photon beams