Li at Big Bang nucleosynthesis energies*

 

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]. I will also discuss the importance of each electromagnetic transitions on α(d,γ)⁶Li at BBN energies.

[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).