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VOLUME 56 (1992) | ISSUE 3 | PAGE 129
Nonequilibrium neutrinos and primordial nucleosynthesis
We have found that the residual interactions between neutrinos and electrons, which have different temperatures after decoupling, result in appreciable spectral distortion of the order of 1 % on the higher energy side of the distribution, when the temperature drops below 1 MeV. The resulting modification in the helium abundance, however, is small. It is only of the order of ΔΥ^ 1.3 X 10^4.