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neutrons from carbon-13

(process by which neutrons are freed in the s process)

Neutrons from carbon-13 (13C) are freed through this fusion step: 

13    4      16
  C +  He ->   O + n
 6    2       8

This is one of the sources of free neutrons used by the s-process in asymptotic giant branch stars.

(atoms,metals,nucleosynthesis,fusion,carbon)
Further reading:
http://en.wikipedia.org/wiki/S-process
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