Gallium Anomaly and Solar Neutrinos

The Gallium Anomaly is the disagreement between the measured capture rate of neutrinos by ${}^{71}$Ga and the rate theoretically expected from the electron capture decay of ${}^{71}$Ge. The experimental measurements were performed with intense artificial sources. In the present work we consider the sun as a neutrino source that can be calibrated via the fundamental, standard-model neutrino-electron elastic scattering reaction in terrestrial detectors. The result is found to be not anomalous, with good agreement between the measured value of $66.1\pm 3.1$ SNU from SAGE and Gallex/GNO, and the total measured source strengths of solar sources, $67.5_{-1.1}^{+1.4}$ SNU. It may be concluded that neither the ${}^{71}$Ga charged-current cross section nor gallium experiment extraction and counting efficiencies account for the Gallium Anomaly.