Experimental Study of the Key Reaction to the Nucleosynthesis in the Inhomogeneous Big Bang Models

Inhomogeneous Big Bang models1-4), which introduced inhomogeneities in baryon density in the quark-hadron phase transition, have succeeded in predicting synthesis of finite metallicity. Among the postulated dominant flow path3), which bypasses the A = 8 gap in the inhomogeneous models, the most unknown process is 8Li(α,n)1 1B. An experiments) for this process was recently reported which used the reverse reaction 11B(n,α)8Li. Some resonances were clearly observed, although crucial physical parameters such as total level widths and the spin-parities were not determined for the resonances. We have studied the property of these resonant states in 12B by using the direct reaction 9Be(α,p)12B.