r-process nucleosynthesis in shocked surface layers of O-Ne-Mg cores

H. Ning, Y. Z. Qian, B. S. Meyer

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

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 α-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.

Original languageEnglish (US)
Pages (from-to)L159-L162
JournalAstrophysical Journal
Volume667
Issue number2 PART 2
DOIs
StatePublished - 2007

Keywords

  • Abundances
  • Nuclear reactions
  • Nucleosynthesis
  • Shock waves
  • Supernovae: General

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