HOPE IT HELPS YOU. Also because the steps involve protons fusing with carbon and heavier nuclei the CNO cycle requires a much higher temperature to overcome the strong Coulomb barrier. As you did with the proton-proton chain determine the net equation for the CNO cycle.
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The p p adeuteron d e n cross section is very small because the protons have to overcome their mutual repulsion tunnel to a distance of about 1 fm. Helium accumulates in the cores of stars as a result of the protonproton chain reaction and the carbonnitrogenoxygen cycle. This sequence proceeds as follows. Reactions of the PP Chain The primary reactions in the main branch of the PP chain are illustrated in the following figure.