Exclusive α-particle and proton production measurements of the system 6 Li+ 28 Si are performed at near-barrier energies. Each reaction channel is tagged via a particle-γ coincidence requirement. Ratios of direct to compound contributions are estimated via particle angular distribution measurements. Strong reaction channels for n and p transfer are identified and quantified and found to be described well on a qualitative basis with distorted-wave Born approximation calculations.
The cross section of the l~B(n, a)8Li reaction has been measured at E,=7.6 to 12.6 MeV. The neutron beam was produced via the D(d, n)3He reaction and a BF3 counter (with natural B isotopic composition) served both as target for the I~B nuclides and as detector for the observation of the delayed a-activity of SLi. The data match well with previous results obtained at E,= 12.5 to 20.0 MeV. Using the principle of detailed balance the data were converted to the case of the SLi(a, no) 11B reaction. The associated astrophysical S(E) factor is dominated by a resonance at ER=0.58MeV of width FR =200 keV, with S(ER)=8400 MeVb. This S(ER) value for the no channel alone is already three times higher than the constant S(E) factor assumed previously and, thus, strengthens the significance of inhomogeneous Big Bang nucleosynthesis.
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