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We report mass measurements of neutron-rich Ga isotopes $^{80-85}$Ga withTRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). The measurementsdetermine the masses of $^{80-83}$Ga in good agreement with previousmeasurements. The masses of $^{84}$Ga and $^{85}$Ga were measured for the firsttime. Uncertainties between $25-48$ keV were reached. The new mass valuesreduce the nuclear uncertainties associated with the production of A $\approx$84 isotopes by the \emph{r}-process for astrophysical conditions that might beconsistent with a binary neutron star (BNS) merger producing a blue kilonova.Our nucleosynthesis simulations confirm that BNS merger may contribute to thefirst abundance peak under moderate neutron-rich conditions with electronfractions $Y_e=0.35-0.38$.

physical review. c

Mass Measurements of Neutron-Rich Gallium Isotopes Refine Production of  Nuclei of the First r-Process Abundance Peak in Neutron Star Merger  Calculations