Short-lived p-nuclides in the early solar system and implications on the nucleosynthetic role of X-ray binaries

Abstract

The data available for short-lived $p$-nuclides are used in an open nonlinear model of the chemical evolution of the Galaxy in order to discuss the origin of extinct radionuclides, the stellar sources of $p$-nuclides, and the chronology of solar system formation. It is concluded that the observed abundances of ${}^{97}$Tc, ${}^{98}$Tc, ${}^{92}$Nb, and ${}^{146}$Sm in the early solar system are consistent with nucleosynthesis in type II supernovae during continuous chemical evolution of the Galaxy and a subsequent short isolation of the presolar molecular cloud from fresh nucleosynthetic inputs. However, further work on supernova models is needed before $p$-radionuclides will comprise reliable cosmochronometers. Despite these limitations, we argue that niobium-92 can be used to test whether the {\it rp}-process contributed to the synthesis of light {\it p}-nuclides in the Mo-Ru region.

arXiv comment8 pages, 2 figures. Proceedings of the Nuclear Physics in Astrophysics Conference, Debrecen, Hungary, 2002, to appear in Nucl. Phys. A

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• The production of proton-rich isotopes beyond iron: The $\gamma$ process in stars
• Uncertainties in the production of $p$ nuclei in massive stars obtained from Monte Carlo variations
• Odd p isotope 113In: Measurement of alpha-induced reactions
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• Galactic Chemical Evolution of Radioactive Isotopes
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• The initial abundance and distribution of 92Nb in the Solar System
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• Cross sections for proton-induced reactions on Pd isotopes at energies relevant for the gamma process
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• Origin of the p-Nuclei in Explosive Nucleosynthesis
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