Carbon burning

12C + 12C -> 24Mg + gamma ray + energy

12C + 12C -> 23Na + proton + energy

12C + 12C -> 20Ne + 4He + energy

12C + 12C -> 23Mg + neutron + energy

12C + 12C -> 16O + 2 4He + energy

Carbon burning requires a temperature of about a billion K to overcome the vary large repulsion between the two positively charged carbon nuclei