| Synthesis
of Light Elements |
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| • | Almost all
neutrons are combined with |
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| protons to
form 4He.
Most synthesis |
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| occurs for T
< 109 K ( t > 100 sec) since |
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| at higher T, D
is destroyed by |
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| background
gammas (compare binding |
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| E of 2.23 MeV
with kT at T of 26 billion K. |
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| • | Details worked
out in classic paper |
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| Wagoner
(1973). |
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