Abstract
The investigation of the cross section of the 8Li(α, n)11B reaction has vital importance for both primordial nucleosynthesis in inhomogeneous models and constraining the physical conditions characterizing the r-process. In order to understand the reaction mechanism at low energies, we have applied the Distorted Wave Born Approximation (DWBA) theory below 2 MeV to determine direct reaction contribution. The total cross section has been calculated for the transitions of excited states to 8Li(α, n)11B. Spectroscopic factor strengths for 8Li(α, n)11B have been calculated within the framework of the shell model. Furthermore, the existing experimental measurements concerning the reaction in question at Big Bang zone and r-process region were analyzed using Wentzel, Kramers and Brilloin method (WKB) and distorted wave born approximation methods respectively. However, both resonance-like structures of 12B at low energies and unclear nuclear structure of 8Li strongly influence total cross section in the Big Bang and r-process zones. It is apparent that reaction mechanism of 8Li(α, n)11B is out of the scope DWBA and WKB. Furthermore, in order to understand reaction mechanisms at low energies, a new experimental setup is proposed for measuring the angular distributions and total cross-section for 8Li(α, n)11B.
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ACKNOWLEDGMENTS
The author gratefully acknowledges the assistance of many people who supported this effort, including DWBA for their guidance in calculations, and fruitful discussions with Dr. Antonio M. Moro from the Departamento de Fisica Atomica, Molecular y Nuclear at Universidad de Sevilla and thank to Alex Brown from Michigan State University for shell model calculations, as well as TRIUMF-Canada people for experimental setup proposal.
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Kilic, A.I. The Investigation of the 8Li(α, n)11B Cross Section at Low Energy by a Distorted Wave Born Approximation Model. Phys. Part. Nuclei Lett. 20, 1335–1341 (2023). https://doi.org/10.1134/S1547477123060183
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DOI: https://doi.org/10.1134/S1547477123060183