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 keV,
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.