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Question

How many helium nuclei fuse together when making carbon?


A
2
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B
3
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C
4
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D
None of the above
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Solution

The correct option is C 3
At sufficiently high temperatures and densities, a 3-body reaction called the triple alpha process can occur: Two helium nuclei ("alpha particles") fuse to form unstable beryllium.
If another helium nucleus can fuse with the beryllium nucleus before it decays, stable carbon is formed along with a gamma ray.

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