r-Process Nucleosynthesis in Shocked Surface Layers of O-Ne-Mg Cores

Details r-Process Nucleosynthesis in Shocked Surface Layers of O-Ne-Mg Cores r-Process Nucleosynthesis in Shocked Surface Layers of O-Ne-Mg Cores

2007-08-13

arxiv.org/abs/0708.1748v1

Astronomy and Astrophysics

Astrophysics

11 pages, 1 figure, to appear in the Astrophysical Journal Letters

Scientific paper

10.1086/522372

We demonstrate that rapid expansion of the shocked surface layers of an O-Ne-Mg core following its collapse can result in r-process nucleosynthesis. As the supernova shock accelerates through these layers, it makes them expand so rapidly that free nucleons remain in disequilibrium with alpha-particles throughout most of the expansion. This allows heavy r-process isotopes including the actinides to form in spite of the very low initial neutron excess of the matter. We estimate that yields of heavy r-process nuclei from this site may be sufficient to explain the Galactic inventory of these isotopes.

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