Physics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975nyasa.262..214w&link_type=abstract
(AAS, American Physical Society, and New York Academy of Sciences, Texas Symposium on Relativistic Astrophysics, 7th, Dallas, Te
Physics
Astronomical Models, Neutrinos, Nuclear Fusion, Solar Corpuscular Radiation, Gravitational Effects, Helium, Maxwell-Boltzmann Density Function, Solar Physics
Scientific paper
First-order models attempting to explain the discrepancy between observed counting rates of solar neutrinos (consistent with an upper limit of the order of 1.5 SNU) and the counting rates predicted by standard theoretic models (6 to 9 SNU) are discussed. Particular attention is given to the models proposed by Wheeler and Cameron (1975) and Clayton (1974). Wheeler and Cameron assume that immiscibility of helium and hydrogen occurred in the proto-Sun, resulting in the gravitational fractionation of droplets of helium-rich material to yield a helium-rich core and a hydrogen-rich shell, which burns at a lower temperature because of the higher fuel concentration. The model predicts a minimum counting rate of about 2 SNU at a fractionated core mass of about 0.1; when metals are assumed to fractionate with the helium a counting rate of about 1.5 SNU is obtained. The model proposed by Clayton is based on a deviation from the exact Maxwell-Boltzmann distribution of the tail of the two-particle distribution function that determines the rate of nuclear reactions. The model lowers the counting rate to about 1 SNU.
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