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We have calculated the small effect of finite nucleon mass on the weak-interaction rates that interconvert protons and neutrons in the early Universe. We have modified the standard code for primordial nucleosynthesis to include these corrections and find a small, systematic increase in the 4He yield, δ Y / Y ≃ (0.47 - 0.50) baryon-to-photon ratio. The fractional changes in the abundances of the other light elements are a few percent or less for interesting values of the baryon-to-photon ratio.doi:10.1103/physrevd.56.3191 fatcat:zlmziqbqyraldanz6q24efsfoy