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The total cross sections of the neutron radiative capture on 12B atastrophysical energies to the ground state of 13B have been calculated in theenergy range of 10E-8 to 10 MeV within the framework of a modified potentialcluster model with the classification of orbital states according to Youngdiagrams. Reaction rates in the temperature range of 0.01 to 10 T9 and theiranalytical parameterization were obtained. The calculated rates of12B(n,gamma)13B excess the previous results by approximately to one order.Cross sections and reaction rates of 12C(n,gamma)13C are calculated andcompared to the n10B, n11B, n12B, and p12C reaction rates. It is proposed thatobtained rates of the 12B(n,gamma)13B reaction should be taken into account innovel scenarios of stable isotope 13C synthesis without of 12C hydrogenburning.

12B(n,gamma)13B reaction as alternative path to astrophysical synthesis of 13C isotope