Metallicity-suppressed collapsars cannot be the dominant r-process source in the milky way

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