The neutron capture cross section of the unstable nucleus 185W has been derived from experimental photo-activation data of the inverse reaction 186W(γ,n)185W. The new result of σ = 687 ± 110 mbarn confirms the theoretically predicted neutron capture cross section of 185W of σ ≈ 700 mbarn at kT = 30 keV. A neutron density in the classical s-process of nn = (3.8 -0.9 +1.1) x 10E08 cm-3 is derived from the new data for the 185W branching. In a stellar s-process model, one finds a significant overproduction of the residual s-only nucleus 186Os.
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