Introduction to Geochemistry
Introduction to Geochemistry
Introduction to Geochemistry
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He Fusion in Red Giants<br />
! Triple alpha process<br />
• A two-step reaction, both steps must occur in rapid succession,<br />
because the 8 Be nuclide decays with a half-life of 10 -16 sec.<br />
• Without this process, entire universe would be only H and He…<br />
Step 1: 4<br />
He + 4 He<br />
Step 2: 8<br />
Be + 4 He<br />
He<br />
12<br />
8<br />
Be<br />
12<br />
C + $<br />
Overall: Three helium nuclei (triple(<br />
%)) produce one carbon
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