Ab initio prediction of α(d,γ)6Li and impact of the 6Li properties onto alpha-induced reactions of astrophysical interest

par Dr Chloë Hebborn (Facility for Rare Isotope Beams - Lawrence Livermore National Laboratory)

jeudi 6 juil. 2023, 14:00 → 15:00 Europe/Paris

100/0-A018 - Salle Library (IJCLab)

 

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] and analyze 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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Abstract.pdf

Hebborn_Orsay2023_static.pdf