Mass measurements in the vicinity of the r p-process and the nu p-process paths with the Penning trap facilities JYFLTRAP and SHIPTRAP

The masses of very neutron-deficient nuclides close to the astrophysical rp- and νp-process paths have been determined with the Penning trap facilities JYFLTRAP at JYFL/Jyvaskyla and SHIPTRAP at GSI/Darmstadt. Isotopes from yttrium (Z = 39) to palladium (Z = 46) have been produced in heavy-ion fusion-evaporation reactions. In total, 21 nuclides were studied, and almost half of the mass values were experimentally determined for the first time: 88Tc, 90−92Ru, 92−94Rh, and 94,95Pd. For the 95Pdm, (21/2+) high-spin state, a first direct mass determination was performed. Relative mass uncertainties of typically δm/m = 5 × 10−8 were obtained. The impact of the new mass values has been studied in νp-process nucleosynthesis calculations. The resulting reaction flow and the final abundances are compared with those obtained with the data of the Atomic Mass Evaluation 2003.