Primordial nucleosynthesis and the abundances of beryllium and boron

The ability to now make measurements of Be and B as well as put constraints on lisix abundances in metal-poor stars has led to a detailed reexamination of Big Bang Nucleosynthesis in the $Agroughly6$ regime. The nuclear reaction network has been significantly expanded with many new rates added. It is demonstrated that although a number of $A>7$ reaction rates are poorly determined, even with extreme values chosen, the standard homogeneous model is unable to produce significant yields (Be/H and B/H $7$. However models that fit the $Ale7$ abundances still seem to have difficulty in obtaining significant $A>7$ yields.Comment: Plain TeX, 28 pages, 8 figures (not included, but available from authors). UMN-TH-1020/9