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arXiv · 2610.22219

Gallium Anomaly and Solar Neutrinos

Steven R. Elliott·R. G. Hamish Robertson
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Abstract

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 $66.1\pm3.1$ SNU from SAGE and Gallex/GNO, and the total measured source strengths of solar sources, $67.5^{+1.4}_{-1.1}$ 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.

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Steven R. Elliott, R. G. Hamish Robertson. 2026-10-15. Gallium Anomaly and Solar Neutrinos. https://arxiv.org/abs/2610.22219

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