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How these nuclei split is predicted only by uncertain models.","posed_since":"","precise":"For neutron-rich nuclei with $Z = 90\\ \\text{to}\\ 105$ and $A = 250\\ \\text{to}\\ 300$, determine fission barrier heights to 1 MeV and fragment mass yields for neutron-induced, beta-delayed and spontaneous fission. Answer: validated barrier and yield systematics and their effect on the $A = 110\\ \\text{to}\\ 170$ abundance pattern and on $\\mathrm{Th}/\\mathrm{U}$ production ratios used to date old stars.","problem_ref":null,"references":"","settled_by":"Microscopic fission calculations (time-dependent density functional theory) calibrated on new data for the most neutron-rich accessible actinides at FRIB and RIKEN.","status_note":"","title":"Fission barriers and fragment yields of r-process 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