MIXING AND THE SOLAR NEUTRINO PROBLEM

Evolutionary sequences for the Sun were calculated assuming continuous or episodic mixing of matter in the solar interior. The ad hoc mixing affects solar neutrino emission because it increases the interior 1H and 3He content and reduces the temperature at the solar center. For a typical postulated massive mixing "event," the flux of the basic pp neutrinos is strongly reduced for ∼ 107 yr following the mixing, and the 8B neutrino is greatly decreased for more than 108 yr. The flux of hep neutrinos is significantly increased for ∼ 105 yr. The neutrino fluxes calculated from the standard (unmixed) solar model obtained here with an independent numerical code agree with the neutrino fluxes of Bahcall and Ulrich to an accuracy of a few percent or better.