HSC Together > Year12 > Nucleosynthesis Reactions


Nucleosynthesis Reactions

This section is part of the HSC Physic syllabus Module 8: From the Universe to the Atom.

In this post we will investigate the types of nucleosynthesis reactions involved in Main Sequence and Post-Main Sequence stars including:

  • Proton-proton chains
  • CNO (carbon-nitrogen-oxygen) cycle


Proton-Proton Chains

Proton-proton chains is the fusion of four protons into a single ordinary helium nucleus.


The CNO Cycle

The ‘CNO cycle’ refers to the Carbon-Nitrogen-Oxygen cycle. This is a process of stellar nucleosynthesis where stars from the Main Sequence fuse hydrogen into helium via a six-stage sequence of reactions.