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We develop a high-performance analytical model of Galactic ChemicalEvolution, which accounts for delay time distributions and lock-up of stellaryields in a thermal-phased ISM. The model is capable of searching, for thefirst time, through the high-dimensional parameter space associated with ther-process enrichment of the Milky Way by its possible sources: Neutron StarMergers and Collapsar events. Their differing formation mechanisms give thesetwo processes different time dependencies, a property which has frequently beenused to argue in favour of collapsars as the dominant r-process source.However, we show that even with large degrees of freedom in the allowedthermal, structural, and chemical properties of the galaxy, large regions ofparameter space are in strong tension with the data. In particular, whilst weare able to find models in which neutron star mergers produce the majority ofr-process material, the data rule out all models with dominant collapsaryields. With no other identified source, we conclude that Neutron Star Mergersmust be the dominant contributors to the modern Milky Way r-process budget.

Metallicity-Suppressed Collapsars Cannot be the Dominant r-Process Source in the Milky Way