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The purpose of this work is to resume investigation of Galactic thin diskdating using nucleocosmochronology with Th/Eu stellar abundance ratios, a themeabsent from the literature since 1990. [Th/Eu] abundance ratios for a sample of20 disk dwarfs/subgiants of F5 to G8 spectral type with -0.8 <= [Fe/H] <= +0.3,determined in the first paper of this series, were adopted for this analysis.We developed a Galactic chemical evolution model that includes the effect ofrefuses, which are composed of stellar remnants (white dwarfs, neutron starsand black holes) and low-mass stellar formation residues (terrestrial planets,comets, etc.), contributing to a better fit to observational constraints. TwoGalactic disk ages were estimated, by comparing literature data on Th/Euproduction and solar abundance ratios to the model ((8.7 +5.8-4.1) Gyr), and bycomparing [Th/Eu] vs. [Fe/H] curves from the model to our stellar abundanceratio data ((8.2 +/- 1.9) Gyr), yielding the final, average value (8.3 +/- 1.8)Gyr. This is the first Galactic disk age determined via Th/Eunucleocosmochronology, and corroborates the most recent white dwarf agesdetermined via cooling sequence calculations, which indicate a low age (<~ 10Gyr) for the disk.Comment: 9 pages, 7 Postscript figures, accepted for publication in Astronomy  & Astrophysics, final versio

The age of the Galactic thin disk from Th/Eu nucleocosmochronology