Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nuas.conf..106t&link_type=abstract
3. International Summer School on Nuclear Astrophysics, p. 106 - 140
Astronomy and Astrophysics
Astrophysics
Nucleosynthesis: Stars, Nucleosynthesis: Supernovae, Supernova 1987A In Lmc
Scientific paper
The present review gives a short introduction to stellar nucleosynthesis with a major focus on explosive processes. After presenting the basic equations for nuclear reaction rates and nuclear reaction networks, the author concentrates on the required nuclear physics input, i.e. reaction cross sections. The emphasis lies on theoretical methods (Hauser-Feshbach) which are applicable for medium and heavy nuclei with high densities of excited states. A variety of astrophysical applications follows. The mechanism of type I supernovae, mass transfer onto white dwarfs in binary systems, and their explosive nucleosynthesis is discussed. Type II supernovae are linked to the gravitational collapse of massive stars (M > 8 Msun) at the end of their hydrostatic evolution. SN 1987A, the first type II supernova for which the progenitor star was known, is used as an example for nucleosynthesis calculations. Finally the author presents a detailed description of the r-process. This includes the analysis of its mechanism, a detailed discussion of the necessary nuclear properties, and a summary of possible r-process scenarios. Unfortunately none of them is verified yet as the major production site of r-process nuclei in our galaxy.
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