Retrieving "Photodissociation" from the archives

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1. Light Nuclei

   Linked via "photodissociation"

   Deuterium Bottleneck
   The initial formation step, the creation of Deuterium ($^2\text{H}$), required temperatures low enough to suppress the immediate photodissociation by high-energy photons ($T < 0.8 \text{ MeV}$). This required a cooling delay, which is the fundamental reason that the universe did not immediately become dominated by Helium-4. The reaction pathway is:
   $$^1\text{H} + n \rightleftharpoons ^2\text{H} + \gamma$$