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Context. Europium is an almost pure r-process element, which may be useful asa reference in nucleocosmochronology. Aims. To determine the photospheric solarabundance using CO5BOLD 3-D hydrodynamical model atmospheres. Methods.Disc-centre and integrated-flux observed solar spectra are used. The europiumabundance is derived from the equivalent width measurements. As a reference 1Dmodel atmospheres have been used, in addition. Results. The europiumphotospheric solar abundance is 0.52 +- 0.02 in agreement with previousdeterminations. We also determine the photospheric isotopic fraction of Eu(151)to be 49 % +- 2.3 % from the intensity spectra and 50% +-2.3 from the fluxspectra. This compares well to the the meteoritic isotopic fraction 47.8%. Weexplore the 3D corrections also for dwarfs and sub-giants in the temperaturerange ~5000 K to ~6500 K and solar and 1/10--solar metallicities and find themto be negligible for all the models investigated. Conclusions. Our photosphericEu abundance is in good agreement with previous determinations based on 1Dmodels. This is in line with our conclusion that 3D effects for this elementare negligible in the case of the Sun.

The solar photospheric abundance of europium. Results from CO5BOLD 3-D hydrodynamical model atmospheres