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The APOGEE Open Cluster Chemical Abundances and Mapping (OCCAM) survey isused to probe the chemical evolution of the s-process element cerium in theGalactic disk. Cerium abundances were derived from measurements of Ce II linesin the APOGEE spectra using the Brussels Automatic Code for Characterizing HighAccuracy Spectra (BACCHUS) in 218 stars belonging to 42 open clusters. Ourresults indicate that, in general, for Ages $<$ 4 Gyr, younger open clustershave higher [Ce/Fe] and [Ce/$\alpha$-element] ratios than older clusters. Inaddition, metallicity segregates open clusters in the [Ce/X]-Age plane (where Xcan be H, Fe, and the $\alpha$-elements O, Mg, Si, or Ca). Thesemetallicity-dependant relations result in [Ce/Fe] and [Ce/$\alpha$] ratios withage that are not universal clocks. Radial gradients of [Ce/H] and [Ce/Fe]ratios in open clusters, binned by age, were derived for the first time, withd[Ce/H]dR$_{GC}$ being negative, while d[Ce/Fe]/dR$_{GC}$ is positive. [Ce/H]and [Ce/Fe] gradients are approximately constant over time, with the [Ce/Fe]gradient becoming slightly steeper, changing by $\sim$+0.009dex-kpc$^{-1}$-Gyr$^{-1}$. Both the [Ce/H] and [Ce/Fe] gradients are shifted tolower values of [Ce/H] and [Ce/Fe] for older open clusters. The chemicalpattern of Ce in open clusters across the Galactic disk is discussed within thecontext of s-process yields from AGB stars, $\sim$Gyr time delays in Ceenrichment of the interstellar medium, and the strong dependence of Cenucleosynthesis on the metallicity of its AGB stellar sources.

Exploring the s-process history in the Galactic disk: Cerium abundances and gradients in Open Clusters from the OCCAM/APOGEE sample