Abstract
19 F(p, a)'O(g.s.) at incident energies of 250, 350 and 450 keV below the Coulomb barrier are analyzed with the finite-range distorted wave Born approximation formalism including both the direct and exchange processes. In order to treat in a consiste~t way the reaction mechanism of the reaction of the ' 9 F(p, a) 16 0(g.s.) at keV and MeV energy ranges, we adopt the value of the spectroscopic amplitude obtained by the analysis of the experimental angular distribution for the same reaction at Ep=18 MeV. Good agreements between theoretical calculations and experiments are obtained. Especially, the energy dependence of the differential cross section is nicely fitted to the data. Numerical calculations show that the direct reaction mechanism is dominant for this reaction, in particular the exchange process plays an important role for reproducing the experimental angular distributions in keV energy ranges.
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