BE-9((P)OVER-RIGHT-ARROW,D)BE-8 AND BE-9((P)OVER-RIGHT-ARROW,ALPHA)LI-6 REACTIONS AT LOW ENERGIES

Angular distributions of cross section and vector analyzing power have been measured for the Be-9((p) over right arrow p, d)Be-8 and Be-9((p ) over right arrow, alpha)Li-6 reactions for 77 less than or equal to E-p less than or equal to 321 keV. Previous work has suggested that th e low-energy cross section is enhanced by the E-x = 6.57 MeV subthresh old level in B-10. The analyzing power measurements are particularly s ensitive to the presence of the subthreshold level, leading to a defin itive test of the hypothesis. The data are analyzed in terms of R-matr ix and direct reaction calculations. We find that the magnitude and an gular distribution of the Be-9(p,d)Be-8 reaction at very low energies can be explained by the direct reaction mechanism without any contribu tion from the subthreshold resonance. The implications of these result s for the stellar reaction rate of the Be-9(p, d)Be-8 and Be-9(p, alph a)Li-6 reactions are discussed.