A detailed analysis of the neutron to proton ratio at the onset of primordial nucleosynthesis

Abstract

We report on the results of a recent evaluation of all percent level corrections to weak rates of processes converting n <-> p, which are crucial for the determination of the 4He mass fraction produced during primordial nucleosynthesis.

Comments: 5 pages, Talk given at the Second Meeting on New Worlds in Astroparticle Physics, September 1998, Faro, Portugal