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.
A Micromegas detector was used in the neutron Time-Of-Flight ðn TOFÞ facility at CERN to evaluate the spatial distribution of the neutron beam as a function of its kinetic energy. This was achieved over a large range of neutron energies by using two complementary processes: at low energy by capture of a neutron via the 6 Liðn; aÞt reaction, and at high energy by elastic scattering of neutrons on gas nuclei (argon+isobutane or helium+isobutane). Data are compared to Monte Carlo simulations and an analytic function fitting the beam profile has been calculated with a sufficient precision to use in neutron capture experiments at the n TOF facility. r
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