Astrophysics (index)

Triple Alpha Process

(fusion reaction chain turning helium-4 into carbon)

The Triple Alpha Process is a fusion reaction in stars turning Helium (He) into Carbon (C). This happens in older stars with abundant helium when the core collapses to produce sufficient heat. Helium fuses into Beryllium-8 which then fuses with another helium atom to produce carbon.

4    4     8
 He + He -> Be (-93.7keV)
2    2     4

8    4     12
 Be + He ->  C (+7.367 MeV)
4    2      6

At about 100,000,000K, helium fuses faster than beryllium-8 decays and this process progresses. After this, some Carbon and Helium can fuse into Oxygen (O).


(fusion,nuclear,reaction,nucleosynthesis,atoms)
http://en.wikipedia.org/wiki/Triple-alpha_process

Referenced by:
Carbon (C)
Horizontal Branch (HB)
Nucleosynthesis

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