r-Process Nucleosynthesis of C12 Seed Nucleus

Details r-Process Nucleosynthesis of C12 Seed Nucleus r-Process Nucleosynthesis of C12 Seed Nucleus

Jun 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970pthph..43.1480o&link_type=abstract

Progress of Theoretical Physics, Vol. 43, No. 6, pp. 1480-1490

Physics

Scientific paper

The produced amount of nuclides by r-process nucleosynthesis is calculated under the condition of high temperature and high density. In this case the seed nucleus of this process is mainly C12, which is pumping-our from the equilibrium system, and absorbs enough free neutrons to succeed the rapid-neutron-capture process. The existence of these free neutrons is due to neutronization by the weak interaction at the time of quasi-stational, hydrodynamic contraction of later stage stars, i. e. presupernovae, and therefore one of the possible astronomical sites of this process is the inner shell of type-I supernovae. The r-process of C12 seed nucleus can explain the abundance of neutron rich nuclei in the mass region of 30 ≲ A ≲ 250 except the region of 50 ≲ A ≲ 65. The nuclei belonging to the latter region may be produced by another type of r-process, which may occur under the condition of rather low temperature and low density, and whose seed nuclei may by Fe-group nuclei.

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