engleski

The Role of 14-MeV Neutrons in Light Element Nucleosynthesis

The 14 MeV neutron-induced nuclear reactions which might contribute to a better understanding of the so-called "cosmological lithium problem" that has been discussed. The BBN theory predicted 7Li overestimated value could be lowered by 2n induced reactions on Li- isotopes and/or 7Be destruction via resonance in d+7Be→9B process. Proposals for 6Li+2 n and 7Li+2 n reactions cross-section evaluations and measurements are discussed in some details. In addition, we discuss also preliminary measurements of n-n coincidences from the 10B(n, 2n)9B 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 9B missing mass spectrum. Improvements for better measurements are suggested.

astrophysics ; astrochemistry ; boron ; gammarays ; neutrons ; nuclear physics ; scintillation counters

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