Journal
ASTROPHYSICAL JOURNAL
Volume 667, Issue 2, Pages L159-L162Publisher
IOP PUBLISHING LTD
DOI: 10.1086/522372
Keywords
nuclear reactions; nucleosynthesis; abundances; shock waves; supernovae : general
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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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