Study Report. Particle Astrophysics D.H. PERKINS Chapter 2.10. Che -Yu Chen 2010-3-06. Primordial nucleosynthesis. Weak reactions in equilibrium Neutron decay The formation reaction begins. Weak reactions in equilibrium.
There are no stable nuclei with A=5, 6 or 8 . The further formation has to await to the onset of helium burning in stars core.