The limiting (slowest) reaction in the CNO-I cycle is the proton capture on; it was recently experimentally measured down to stellar energies, revising the calculated age of globular clusters by around 1 billion years.
The limiting (slowest) reaction in the CNO-I cycle is the proton capture on. In 2006 it was experimentally measured down to stellar energies, revising the calculated age of globular clusters by around 1 billion years.