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Unformatted text preview: 5The cooling universe and the formation of Nuclei 04:34 universe was once hot and dense at high densities and temp, collisions are so energetic that bonds that tie the electrons to nucleus are broken by typical collisions; elements are “ionized” with nuclei and e moving independently
“weak interactions” allow conversions btw protons and neutrons
• at high temp, equal # protons and neutrons
• as temp dropped, weak interactions started favoring protons over neutrons and fraction of protons started to increase 04:34 04:34 ...
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- Spring '11
- #, universe, conversions btw protons, at high densities