Retrieving "Proton Capture" from the archives

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1. Electron Capture

   Linked via "proton capture"

   In solar fusion processes, the intermediate nuclide $\text{Be}-7$ undergoes electron capture to form $\text{Li}-7$:
   $$^7\text{Be} + e^- \rightarrow ^7\text{Li} + \nu_e$$
   This reaction dictates the relative abundance of lithium produced in stars. If the surrounding stellar plasma is sufficiently hot and dense, proton capture ($\text{pp}-\text{III}$ branch) on $\text{Be}-7$ can compete, leading to $\text{B}-8$ production instead, highlighting the sensitivity of [stellar evolution](/entries/stella…

2. Proton Proton Chain

   Linked via "proton capture"

   pp-Chain III (The High-Energy Branch)
   The ppIII chain, though representing less than $1\%$ of solar/) energy production, is critical for understanding high-temperature environments or testing theories of exotic particle interaction. It proceeds from the $^7\text{Be}$ stage via proton capture instead of electron capture:
   $$^7\text{Be} + ^1\text{H} \rightarrow ^8\text{B} + \gamma$$