Physics – Nuclear Physics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996nuphs..48..304.&link_type=abstract
Nuclear Physics B, Proc. Suppl., Vol. 48, p. 304 - 308
Physics
Nuclear Physics
Solar Neutrinos
Scientific paper
Since May 1991, the GALLEX experiment-installed in the Gran Sasso Underground Laboratory is continuously monitoring the solar neutrino signal by measuring the 71Ge production rate in a target of 30.3 tons of natGa. The measured signal 77.1±8.5 (stat)+4.4,-5.4 SNU (1σ) is well below the Standard Solar Model (SSM) prediction: ≅120 - 130 SNU. To exclude unknown systematic effects as responsible for the observed deficit, an experiment with a (62.5±0.4) PBq 51Cr neutrino source has been performed. The ratio R = 0.97±0.11 between measured and expected Cr-produced 71Ge demonstrates that the deficit cannot be ascribed to unknown experimental systematics. Although astrophysical reasons could still remain as a possible explanation of the solar neutrino puzzle, the authors recall that the GALLEX result, when considered together with the results of the other solar neutrino experiments, would allow to strongly constrain the neutrino masses and mixing angles in the framework of the MSW effect.
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