Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...417..713h&link_type=abstract
Astrophysical Journal v.417, p.713
Astronomy and Astrophysics
Astronomy
40
Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Supernovae: General
Scientific paper
The high-entropy α-rich freeze-out of neutron-rich nuclei suggested by Woosley and Hoffman and the subsequent formation of r-nuclides are studied in the framework of a recent supernova model. The calculations are performed with the help of a single reaction network that is able to describe the establishment of the nuclear statistical equilibrium, the charged-particle reaction freeze-out, and the subsequent neutron captures and β-decays that produce the r-nuclides. We analyze the effect of using various models for the nuclear binding energies, and in particular the new Extended Thomas-Fermi plus Strutinsky Integral method and the finite-range droplet model. These nuclear mass models are also used to calculate the β-decay rates with the gross theory. We delineate the range of entropies necessary to produce a solar-system-like distribution of the r-nuclides. We also discuss in detail how the freeze-out affects the final r-process abundance distribution.
Arnould Marcel
Goriely Stephane
Howard Michael W.
Rayet Marc
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