We report the results on Big Bang Nucleosynthesis ( BBN ) based on an updated code , with accuracy of the order of 0.1 \% on ^ { 4 } He abundance , compared with the predictions of other recent similar analysis .
We discuss the compatibility of the theoretical results , for vanishing neutrino chemical potentials , with the observational data .
Bounds on the number of relativistic neutrinos and baryon abundance are obtained by a likelihood analysis .
We also analyze the effect of large neutrino chemical potentials on primordial nucleosynthesis , motivated by the recent results on the Cosmic Microwave Background Radiation spectrum .
The BBN exclusion plots for electron neutrino chemical potential and the effective number of relativistic neutrinos are reported .
We find that the standard BBN seems to be only marginally in agreement with the recent BOOMERANG and MAXIMA-1 results , while the agreement is much better for degenerate BBN scenarios for large effective number of neutrinos , N _ { \nu } \sim 10 .