The Carbon burning process reference article from the English Wikipedia on 24-Jul-2004
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Carbon burning process

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The carbon burning process is a nuclear fusion reaction that occurs in massive stars that have used up the lighter elements in their cores. It only occurs at 5-8×108K.

12C + 12C
   
24Mg + γ
   
23Mg + n
   
23Na + 1H
   
20Ne + 4He
   
16O + 24He