"Scientists aren't perfect, just peer reviewed.""Eye of Sauron Observatory", featuring "Sauron's Other Eye", 16" dob, conical Royce mirror.
Quote:Not really sure. I would suspect that the excited state of 16O that produces the gamma decay is due to narrow resonances in the nucleus. Since the proton that is captured by the 15N is spread over a wide distribution of energies, it is most likely that the proton doesn't have the needed energy to produce that resonance in the nucleus. Thus having sufficient energy, an alpha particle would most likely tunnel out.
Quote:Icko Iben, Jr. (2013) page 285"...once every ~2200 times that an 15N nucleus reacts with a proton, the resulting compound nuclus decays into an 16O with the release of a gamma ray rather than into a 12C nucleus and a alpa paticle...."He also shows some tableswith other discusion on lifetime of varios isotopes.Hope this helps!
Quote:Well, the 16O is the O isotope that is 99+% of the O in the universe (meaning it is rather stable), and has a higher binding energy per baryon than 4He... But the question is that the reaction doesn't take place to begin with, not that the product isn't stable...
Quote:This seems like a good candidate for accelerator experiments. If they've been done, do the dominant and alternative reactions occur a similar frequencies?
Quote:Well of course, 16O is stable. But an excited 16O that has just formed from capturing a proton with some decent energy is not just some random 160 floating around. Not sure what it is, but there is some temp when the probabilities of the CNO occuring will take dominance. Apparently, our Sun isn't quite there.
Quote:I eventually found this evidently classic work: Synthesis of the Elements in Stars. Also this more recent page has an overview and lots of interesting links.