In order to understand the r-process nucleosynthesis, we evaluate the precision required for mass and β-decay half-life measurements planned at future radioactive-ion-beam facilities. To satisfy a simple requirement that we put on nuclear model predictions, it is concluded that the detectors for the mass measurements must have a precision of 1σ ≲ 250 keV1 and that the detectors for the half-life measurements demand a precision of 1σ ≲ 0.15 ms. The above two specifications are required at the neutron richness of A/Z = 3.0 at the N = 82 shell closure and A/Z = 2.9 at the N = 50 shell closure. For the doubly magic nuclide 78Ni, a precision of 1σ ≲ 300 keV and 1σ ≲ 5 ms are required, respectively, for mass and half-life measurements. This analysis aims at providing a first rough guide for ongoing detector developments.
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