  Comparing the latest observed abundances of 4He and D, we make a ?2 analysis
to see whether it is possible to reconcile primordial nucleosynthesis using
up-to-date nuclear data of NACRE II and the mean-life of neutrons. If we adopt
the observational data of ${}^4_{}$He by Izotov et al., we find that it is
impossible to get reasonable concordance against the standard Big-Bang
nucleosynthesis. However, including degenerate neutrinos, we have succeeded in
obtaining consistent constraints between the neutrino degeneracy and the
baryon-to-photon ratio from detailed comparison of calculated abundances with
the observational data of ${}^4_{}$He and D: the baryon-to-photon ratio in
units of $10^{-10}$ is found to be in the range 6.02 < $\eta^{}_{10}$ < 6:54
for the specified parameters of neutrino degeneracy.
