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The reaction Li(a, n ) "B is of interest in inhomogeneous big bang nucleosynthesis. A distorted wave Born approximation calculation employing folding potentials is presented for energies below the Coulomb barrier. The recently observed resonance at about 540 keV center-of-mass energy can be reproduced. The astrophysical S factor is calculated for the ground-state transition as well as for the transitions to the first four excited states of "B. The reaction rate is derived and compared to literature data. The inclusion of the excited states increases the rate by a factor of 1.5 compared to the groundstate transition.PACS number(s): 25.40.Hs, 98.80.Ft, 24.50.+ g

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AbsIracL W have calculaled the cross Sections for the d w g e symmelric reactions 3He(3He,2p)'He and 3He(3He,2p)'He at suhCoulomb energies in the potenlial model. God agreement with lhe experimental data is obtained. The astrophysical S factors in the lhermonuclear energy mnge are calculated.