RATE OF H-3(LI-7,N0)BE-9 AND BIG-BANG NUCLEOSYNTHESIS

The differential cross sections for the H-3(Li-7, n0)Be-9 reaction were measured at 5 angles in the energy range E(c.m.) = 0.2-0.9 MeV using a pulsed Li-7 beam and time-of-flight technique. Absolute values of the cross section were obtained by comparison with the well-known cross section of H-3(d, n)He-4 at E(d) = 1.0 MeV. The resulting reaction rates are obtained at temperatures relevant to big-bang nucleosynthesis, and consequences for primordial Be-9 abundances are discussed.