abundance of lighter elements and nucleosynthesis

16.04.2010 -
Weiter zu Heavy elements -
Big Bang Nucleosynthesis. The Universe's light-element abundance is another important criterion by which the Big Bang hypothesis is verified. It is now known that the elements observed in the Universe were created in either of two ways. Light elements (namely deuterium, helium, and lithium) were produced in the first few
7 Big Bang Nucleosynthesis. One quarter (by mass) of the baryonic matter in the universe is helium. Heavier elements make up a few per cent. The rest, i.e., the .... the production of heavier nuclei, and prevents them from following their equilibrium abundances. As the temperature falls, the equilibrium abundances rise fast.
21.11.2016 -
Primordial Nucleosynthesis. Nuclear reactions set in when the temperature is down to about 0.1 Mev, since before that deuterium is prevented by photo-disintegration from building up to a sufficient abundance to allow further reactions to occur (the deuterium bottleneck). Physical constants affecting the outcome are,
How to reconstruct the abundances of light elements shortly after the big bang, and thus test some important predictions of the big bang models against observation.
Big Bang Nucleosynthesis was incapable to produce heavier atomic nuclei such as those necessary to build human bodies or a planet like the earth. Instead, those nuclei were formed in the interior of stars. By the same token, the element abundances we see around us are not the "primordial abundances" right after Big
10.06.2014 -
26.09.2012 -

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