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Hockenbery","submitted_at":"2026-08-05T23:47:58Z","abstract_excerpt":"We present measurements for the masses of five neutron-rich isotopes, $^{149-151}$Cs and $^{151, 152}$Ba, probed for the first time by TITAN at TRIUMF with time-of-flight measurement techniques. We propagate these masses to the nuclear reaction and decay data required for the simulation of the rapid neutron capture process (r-process) nucleosynthesis in neutron star mergers. We show that these neutron-rich masses affect the abundance predictions near mass number $A\\sim148-152$ corresponding to lanthanide element abundances at $Z=60,\\,62$ and $63$. 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