(p, α) Reactions in Li7, Be9, and C12 at 15.0-18.6 MeV

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Scientific paper

Angular distributions of alpha particles from the Li7(p, α)He4 reaction were measured at bombarding energies of 15.0 and 18.6 MeV, and Be9(p, α)Li6 and C12(p, α)B9 angular distributions were each measured at 15.6 and 18.6 MeV. Absolute cross sections were measured for all of the reactions. The main features of the Li7(p, α)He4 angular distributions, which are symmetric about 90 deg, can be reproduced by the appropriately symmetrized triton pickup theory. The Be9(p, α)Li6 ground state and Be9(p, α)Li6* (2.2 MeV) reactions exhibit backward peaking which suggests a possible contribution from heavy particle stripping. The C12(p, α)B9 angular distributions are oscillatory but cannot be fitted satisfactorily using the plane wave triton pickup or knock-on theories. The oscillations in the Li7(p, α)He4 and C12(p, α)B9 angular distributions do not shift in angle as the bombarding energy is changed, so that the value used for the interaction radius must be decreased as the proton energy is raised. None of the angular distributions are strongly energy dependent, and all of the cross sections decrease with increasing bombarding energy.

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