The role of 14 MeV neutrons in light element nucleosynthesis

The 14 MeV neutron induced nuclear reactions which might contribute to better understanding of so-called "cosmological lithium problem" have been discussed. The BBN theory predicted Li-7 overestimated value could be lowered by 2ninduced reactions on Li-isotopes and/or Be-7 destruction via resonance in d+Be-7 -> B-9 process. Proposals for Li-6+(2)n and Li-7+(2)n reactions cross section evaluations and measurements are discussed in some details. We discuss also a preliminary measurements of n-ncoincidences from the B-10(n,2n)B-9 reaction with two neutron detectors placed outside the cone of 14 MeV tagged neutron beam. From the time-of-flight measurements and known geometry we deduce the neutron energies and calculate the B-9 missing mass spectrum.