The Role of 14-MeV Neutrons in Light Element Nucleosynthesis

The 14-MeV neutron induced nuclear reactions which might contribute to better understanding of the so-called "cosmological lithium problem" have been discussed. The big hang nucleosynthesis theory predicted Li-7 overestimated value could he lowered by (2)n-induced reactions on Li isotopes and/or Be-7 destruction via resonance in the 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. In addition, we discuss also a preliminary measurements of n-n coincidences 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 tried to deduce the neutron energies and calculate the B-9 missing mass spectrum. Improvements for better measurements are suggested.