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We use a numerical Galactic chemical evolution model and find that the commonenvelope jets supernova (CEJSN) r-process scenario can account for both thevery early average ratio of europium to iron and its evolution at later timesin the Milky-Way (MW) Galaxy. In the CEJSN scenario a neutron star (NS)spirals-in inside a red supergiant (RSG) star all the way to the core anddestroys it. According to this scenario r-process isotopes arenucleosynthesized inside neutron-rich jets that the accretion disk around theNS launches inside the core. The merger of a NS with an RSG core already takesplace in the very young Galaxy. We conclude that CEJSNe can be a majorcontributor to r-process nucleosynthesis.

Common envelope jets supernova r-process yields can reproduce $\rm [Eu/Fe]$ abundance evolution in the Galaxy