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Within the framework of the modified potential cluster model with forbiddenstates and their classification according to Young diagrams, the possibility ofdescribing experimental data on the total cross sections of the neutronradiative capture on 7Li is considered. It is shown that the model used and themethods for constructing potentials make it possible to correctly describe thebehavior of experimental cross sections at energies of 5 meV (5 10-3 eV) to 1MeV(1 10+6 eV), where experimental data are available. Based on the obtainedtotal cross sections up to 5 MeV, the reaction rate was calculated and itsanalytical approximation was carried out. It was shown that the 7Li(n,g)8Lireaction dominates at T9 < 0.1-0.2 as against with the burning of 7Li inreactions 7Li(3H,n)9Be and 7Li(4He,g)11B.

The comparative role of 7Li(n,{\gamma}) reaction in primordial nucleosynthesis