The radiative capture α(d,γ)6Li is the dominant process in the Big Bang Nucleosynthesis (BBN) of 6Li. It therefore strongly influences the abundance ratio of 6Li/7Li, for which observational data are three orders of magnitude higher than BBN predictions. Because of the low cross section and the large experimental uncertainties, it is crucial to have accurate predictions. In this talk, I will present an ab initio calculation of α(d,γ)6Li, where all nucleons are active and interacting through chiral-EFT nucleon- and three-nucleon forces. After reviewing the ab initio no-core shell model with continuum method, I will show our results [1] which are in excellent agreement with the recent LUNA data [2] andanalyze the importance of each electromagnetic transitions on α(d,γ)6Li at BBN energies. In the last part of the talk, I will discuss how this ab initio prediction of 6Li impact the properties extracted from (6Li,d) transfer data, and the repercussions on the evaluation of the 13C(α,n)16O and 12C(α, γ)16O reaction rates, which are relevant for the astrophysical s-process nucleosynthesis and helium burning reactions.
[1] C. Hebborn, G. Hupin, K. Kravvaris, S. Quaglioni, P. Navrátil and P. Gysbers, Phys. Rev. Lett. 129, 042503 (2022).
[2] Anders et al. Phys. Rev. Lett. 113, 042501 (2014).
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