Essentially all of the elements that are heavier than lithium were created much later, by stellar nucleosynthesis in evolving and exploding stars. A useful analogy for this phenomenon has to do with parking lots. There might be a discussion about this on the talk page.
This data is generated by a computer program and has specific temperature and gravity constants programmed in. Note that the neutron-proton freeze-out time was earlier. If they do, are they in agreement on the Helium abundance? Such a process would require that the temperature be hot enough to produce deuterium, but not hot enough to produce helium-4, and rafio this process should immediately cool to non-nuclear temperatures after no more than a few minutes. Essentially all of the elements that are heavier than lithium were created much later, by stellar nucleosynthesis in evolving and exploding stars. It is worth thinking about why or why not the synthetic spectra fits. However, we must take into consideration that neutrons decay.A few seconds after the Big Bang, almost all of the energy density in the Universe was in photons The determination of the neutron:proton ratio. • Fusion and. This is Primordial Nucleosynthesis, also referred to as Big Bang Nucleosynthesis (BBN). The Neutron-to-Proton Ratio. Before neutrino decoupling at around. 7Li were mainly produced already in the big bang, in a process we call Big Bang . both µe and µν and get that the equilibrium neutron/proton ratio is n p.