Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-08-19
Nucl.Phys.B540:3-36,1999
Astronomy and Astrophysics
Astrophysics
50 pages, latex, 15 figures, minor changes in formulas and figures
Scientific paper
10.1016/S0550-3213(98)00757-3
We report the results of a detailed calculation of nucleon weak interactions relevant for the neutron to proton density ratio at the onset of primordial nucleosynthesis. Radiative electromagnetic corrections, finite nucleon mass terms, thermal radiative effects on weak processes and on neutrino temperature are taken into account to reduce the theoretical uncertainty on $n \leftrightarrow p $ rates to 1%. This translates into a sensitivity in $^4 He$ mass fraction $Y_p$ prediction up to $10^{-4}$. We find a positive total correction to the Born prediction $\delta Y_p \simeq 0.004$.
Esposito Salvatore
Mangano Gianpiero
Miele Gennaro
Pisanti Ofelia
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