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The prediction of isotopic abundances resulting from the rapid neutroncapture process (r-process) requires high-precision mass measurements. Massmeasurements of $^{79-83}$Zn and $^{85,86}$Ga using TITAN's on-linetime-of-flight spectrometer. First time measurements are performed for$^{79m}$Zn, $^{83}$Zn, and $^{86}$Ga. These measurements reduced uncertainties,and are used to calculate isotopic abundances near the first r-processabundance peak using astrophysical conditions present during a binary neutronstar (BNS) merger. Good agreement across a range of trajectories is found whencomparing to several metal-poor stellar abundances. Particularly, this subsetof trajectories produces agreement with the abundance pattern of both the`r/s-star' HD94028 as well as the `r-process star' HD222925. These findingspoint to a high degree of sensitivity to the electron fraction of a BNS mergeron the final elemental abundance pattern near the first r-process peak. Inparticular, we find that small changes in electron fraction produce distinctabundance patterns that match those of metal-poor stars with differentclassifications, calls the need for an i-process into question.

Direct mass measurements of neutron-rich zinc and gallium isotopes: an investigation of the formation of the first r-process peak