Isobar-analogue reactions ⁶Li(p,γ)⁷Be and ⁶Li(n,γ)⁷Li relevant to the ⁶Li/⁷Li ratio

In the framework of the modified potential cluster model with forbidden states formulated in [1] the isobar-analogue ⁶Li(p,γ)⁷Be and ⁶Li(n,γ)⁷Li reactions in the temperature range from 0.01 to 10 T₉ are studied. While the dominant sources that determine the ⁶Li/⁷Li ratio are ⁴He(d,γ)⁶Li and ⁴He(t,γ)⁷Li processes, a qualitative feature of the reactions of radiative capture of neutrons ⁶Li(n,γ)⁷Li and protons ⁶Li(p,γ)⁷Be(e^-ν)⁷Li can lead to a redistribution of lithium isotopes in the ⁶Li/⁷Li balance. These reactions are included in the calculations of the mass fractions as “destructive” for the ⁶Li isotope. The contribution of the isobar-analogue ⁶Li(p,γ)⁷Be and ⁶Li(n,γ)⁷Li reactions into the ⁶Li/⁷Li balance is estimated from the corresponding rates of these processes, the astrophysical S-factor for ⁶Li(p,γ)⁷Be is calculated and compared with the available experimental data and calculations done within different models. Cross-sections for ⁶Li(p,γ)⁷Be and ⁶Li(n,γ)⁷Li calculated using [1] are in reasonable agreement with experimental data.



[1] S. B. Dubovichenko, A. S. Tkachenko, R. Ya. Kezerashvili, N. A. Burkova, A. V. Dzhazairov-Kakhramanov, Phys. Rev. C 105, 065806, 2022.