Abstract
Abstract The cross sections of 59Co(α, p)62Ni and 59Co(α, n)62Cu have been measured over bombarding energy ranges of 5.18–9.40 MeV and 5.07–9.80 MeV, respectively. The 59Co(α, p)62Ni measurements were made with a charged-particle detector at 125° c.m., and the 59Co(α, n)62Cu measurements were based on observation of neutrons by means of a 4π detector and also on observation of the yield of annihilation γ-rays associated with the positron decay of 62Cu. The cross sections have been compared with the predictions of statistical-model calculations made with global optical-model parameters, and a set of modified parameters has been found which gives a better overall fit. Thermonuclear reaction rates at temperature representative of those encountered in freeze-out from nuclear statistical equilibrium in supernovae have been calculated.
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