Silicon carbide grains of type C provide evidence for the production of the unstable isotope 32 Si in supernovae.

@article{Pignatari2013SiliconCG,
  title={Silicon carbide grains of type C provide evidence for the production of the unstable isotope 32 Si in supernovae.},
  author={Marco Pignatari and Ernst K. Zinner and M. G. Bertolli and Reto Trappitsch and Peter Hoppe and Thomas Rauscher and Christopher L. Fryer and Falk Herwig and Raphael Hirschi and Francis X. Timmes and F. Thielemann},
  journal={The Astrophysical Journal},
  year={2013},
  volume={771}
}
Carbon-rich grains are observed to condense in the ejecta of recent core-collapse supernovae, within a year after the explosion. Silicon carbide gr ains of type X are C-rich grains with isotpic signatures of explosive supernova nucleosynthesis have been found in primitive meteorites. Much rarer silicon carbide grains of type C are a special sub-group of SiC grains from supernovae. They show peculiar abundance signatures for Si and S, isotopically heavy Si and isotopically light S, which appear… 

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