Speaker
Description
In the consistent approach, total cross-sections and reaction rates of radiative neutron capture on lithium isotopes $^{6-8}$Li in the temperature range from 0.01 to 10 $T$$_9$ within the framework of the modified potential cluster model (MPCM) with forbidden states are considered [1-3]. These reactions are of significant astrophysical interest as a part of the chain of primordial nucleosynthesis processes of the Universe [4,5].
Estimation of reaction $^6$Li$(n,\gamma_{0+1})^7$Li has been done in our work [1] in the context of comparison with the isobar-analog reaction $^6$Li$(p,\gamma)^7$Be [6]. The role of $^7$Li$(n,\gamma_{0+1})^8$Li reaction in BBN is examined in [2].
Our first calculation of reaction $^8$Li$(n,\gamma_{0+1})^9$Li is considered in [3]. Now we re-estimate this process for reaction $^8$Li$(n,\gamma_{0+1})^9$Li with renewed characteristics. The effect of the value of the asymptotic constant on the behavior of the total capture cross-sections is studied. Compared with our previous results, the total cross sections for radiative capture at energies in the range from 0.01 eV to 5 MeV are obtained, which generally agree with the results of experimental measurements. Furthermore, an approximation of the obtained capture rate by a simple analytical expression is executed.
The comparison of the obtained reaction rates of the $^{6-8}$Li$(n,\gamma)$ processes is performed. These results are directly related to the discussion of the lithium problem $^6$Li/$^7$Li ratio.
References
1. S. B. Dubovichenko, et al. Nucl. Phys. A 1027, 122520 (2022).
2. N. A. Burkova, et al. Jour. Phys. G 48, 045201(21pp) (2021).
3. S. B. Dubovichenko, et al. Astrophys. Jour. 819, 78 (8pp) (2016).
4. S. Q. Hou, et al. Astrophys. J. 834, 165 (2017).
5. V. Guimaraes, et al. Proceedings of Int. Symposium on Nucl. Astrophys. Nuclei in the Cosmos - IX 108 (2006).
6. S. B. Dubovichenko, et al. Phys. Rev. C 105, 065806 (2022).
