Other
Scientific paper
Jul 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970natur.227..266d&link_type=abstract
Nature, Volume 227, Issue 5255, pp. 266-267 (1970).
Other
15
Scientific paper
EXPERIMENTS to detect the neutrino flux from the Sun could be used to test the basic hypotheses concerning the internal constitution of the Sun and the nuclear fusion reactions believed to be occurring in its interior. The measurements of Davis, Harmer and Hoffmann1 give an upper bound on the neutrino counting rate which is approximately half of the theoretical rate calculated by Bahcall, Bahcall and Shaviv2, and an order of magnitude smaller than theoretical rates obtained by other authors. Before the discrepancy between theory and experiment can be accepted as requiring a radical change in the theory of stellar structure, it is first necessary to reduce the uncertainties and poor approximations contained in the ``constitutive relations'' of the theory; that is, in the equations for the nuclear reaction rates, the pressure and the opacity3, each expressed as a function of density, temperature and chemical composition of the medium. In current tables4 of solar opacity, the contribution from the scattering of radiation by free electrons is calculated under the unjustified assumption that the plasma of the solar interior can be treated as a perfect classical gas, and hence that the scattering cross-section is given simply by the classical frequency-independent Thomson cross-section Neσt, for Ne independent electrons in the plasma. This report shows that corrections to σt produced by classical5-7 and quantum6 electron correlations reduce the electron-scattering opacity in the core of the Sun by approximately one-third, and that this leads to a significant reduction in the theoretical neutrino flux.
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