Abstract
Ground-state reaction rates have been deduced from recent cross section measurements for the /sup 42/CA(..cap alpha.., n)/sup 45/Ti, /sup 42/Ca(p, ..gamma..)/sup 43/Sc, and /sup 44/Ca(p, n)/sup 44/Sc reactions. Comparison of these rates with those calculated from a statistical model of nuclear reactions. (Woosley et al) shows good agreement for the first two, but the /sup 44/Ca(p, n) rate is more than a factor of 2 less than the theoretical prediction. Stellar reaction rates have been derived from the ground-state rates by multiplying the ground-state rates by the ratio of stellar to ground-state rates given by the statistical model. Both ground-state and stellar rates have been represented by analytic functions of the temperature. The role of these reactions in the approach to quasi-equilibrium during explosive silicon burning is discussed.
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