The neutron-rich silicon-burning and equilibrium processes of nucleosynthesis

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Abstract
It has long been assumed that the lower-mass isotopes S-36, Ca-46, and Ca-48 were products of an r-process. However, an r-process should be expected to produce more nearly comparable abundances of Ca-46 and Ca-48. It is shown that Ca-48 forms a distinct component uncorrelated with the middle-range Ca isotopes in Allende inclusions. Results of computations are presented, showing isotopic yields in neutron-rich equilibrium and silicon-burning processes. It appears that not more than about 10% of Ca-48 can have come from the neutron-rich equilibrium process. However, there is a good possibility that neutron-rich silicon-burning can have produced the observed abundances of S-36 and Ca-48 as well as possibly Ca-46 and Ti-50. There may be some interesting implications for supernova explosions.

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