Mass measurements in the vicinity of the rp-process and the nu p-process paths with JYFLTRAP and SHIPTRAP

Abstract

The masses of very neutron-deficient nuclides close to the astrophysical rp- and nu p-process paths have been determined with the Penning trap facilities JYFLTRAP at JYFL/Jyväskylä 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 $\delta m/m=5\times 10^{-8}$ were obtained. The impact of the new mass values has been studied in nu p-process nucleosynthesis calculations. The resulting reaction flow and the final abundances are compared to those obtained with the data of the Atomic Mass Evaluation 2003.

21 pages, 12 figures, 2 tables, submitted to Phys. Rev. C

References in corpus (6)

• An improved calculation of the isospin-symmetry-breaking corrections to superallowed Fermi beta decay
• The rp-Process in Neutrino-driven Winds
• Evolution of the N=50 shell gap energy towards ${}^{78}$Ni
• Q_EC values of the Superallowed beta Emitters 50Mn and 54Co
• Precise atomic masses of neutron-rich Br and Rb nuclei close to the r-process path
• Mass Measurements and Implications for the Energy of the High-Spin Isomer in 94Ag

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• On the origin of the lightest Molybdenum isotopes
• Uncertainties in $\nu$p-process nucleosynthesis from Monte Carlo variation of reaction rates
• Penning trap mass measurements on (99-109)$Cd with ISOLTRAP and implications on the rp process
• Massive Stars and their Supernovae
• High-precision mass measurements of neutron deficient silver isotopes probe the robustness of the $N$ = 50 shell closure
• High-accuracy Penning trap mass measurements with stored and cooled exotic ions
• A new phenomenological formula for ground state binding energies
• Probing the quantum phase transition around $N\approx 60$ via mass measurements of technetium isotopes