Abstract
Angular distributions of the 11C and 13N recoil nuclei from the reactions of 24.8 MeV 3He particles with 12C have been determined by assay of the radioactive nucleides after their collection in catcher foils. Data for laboratory angles from 7° to 170° are presented. Structure in the 11C angular distribution is readily apparent. A calculated 11C angular distribution, based upon the distorted-wave theory of direct reactions, can reproduce essentially all of the details of the experimental data. It is concluded from these data that the 12C( 3He, α) 11C reaction proceeds predominantly by direct pick-up. Contrastingly, the 13N recoil data, when compared with the data of Wegner and Hall for the 12C( 3He, d 0) 13N reaction which can be fitted with the results of a direct stripping calculation, indicate that the ( 3He, pn) reaction is a significant contributor (> 60 %) to the 12 C → 13 N cross section. Neither the shape nor the magnitude of the 13N angular distribution can be explained on the basis of ( 3He, d) stripping alone.
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