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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 the the appreciable spectral distortion of the order of 1% in the higher energy side of the distribution, when the temperature drops to below lMeV. The resulting modification in the helium abundance, however, is small, and only of the order of AY и 1.3 χ Ю-4.