  The low second acoustic peak in the recent Boomerang data may indicate a
cosmological baryon density which is larger than allowed by standard big bang
nucleosynthesis.
  We show that the decay of the tau-neutrino: nu_tau -> nu_e + phi, where nu_e
is the electron neutrino and phi is a scalar, essentially can assure agreement
between BBN calculations and light element observations for a large baryon
density.
