Abstract :
Nowadays, the Cosmic Microwave Background (CMB) anisotropy studies accurately determine the baryon fraction ωb showing an overall and striking agreement with previous determinations of ωb obtained from Big Bang Nucleosynthesis (BBN). However, a deeper comparison of BBN predictions with the determinations of the primordial light nuclide abundances shows some tension, motivating an effort to further improve the accuracy of theoretical predictions, as well as to better evaluate systematics in both observations and nuclear reactions measurements. We present some results of an important step towards an increasing precision of BBN predictions, namely an updated and critical review of the nuclear network, and a new protocol to perform the nuclear data regression.
