Big Bang Nucleosynthesis

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Formation of elements in the Big Bang. Calculated abundances of these isotopes (D (deuterium = 2H), 3H, 3He, 4He, 6Li, 7Li, and 7Be) and of protons (1H) and neutrons (n) vs. time are shown in the diagram. Note that the mass fraction scale is logarithmic and very little Li and Be were formed. All heavier elements were formed in stars.

Using the observed abundances of early formed elements and isotopes, it is possible to estimate the overall density of the universe The boxes and arrows show the observed values for the isotopes indicated; the cyan band is the best estimate of baryon density using these data.

Some or all content above used with permission from J. H. Wittke.

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