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Does the sun shine by pp or CNO fusion reactions?
John N Bahcall1, M C Gonzalez-Garcia, Carlos Peña-Garay
1School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08540, USA.
Physical Review Letters
|April 12, 2003
Abstract:
We show that solar neutrino experiments set an upper limit of 7.8% (7.3% including the recent KamLAND measurements) to the fraction of energy that the Sun produces via the CNO fusion cycle, which is an order of magnitude improvement upon the previous limit. New experiments are required to detect CNO neutrinos corresponding to the 1.5% of the solar luminosity that the standard solar model predicts is generated by the CNO cycle.