The gallium anomaly revisited

Abstract

The gallium anomaly, i.e. the missing electron-neutrino flux from ${}^{37}$Ar and ${}^{51}$Cr electron-capture decays as measured by the GALLEX and SAGE solar-neutrino detectors, has been among us already for about two decades. We present here a new estimate of the significance of this anomaly based on cross-section calculations using nuclear shell-model wave functions obtained by exploiting recently developed two-nucleon interactions. The gallium anomaly of the GALLEX and SAGE experiments is found to be smaller than that obtained in previous evaluations, decreasing the significance from 3.0$\sigma$ to 2.3$\sigma$. This result is compatible with the recent indication in favor of short-baseline ${\bar{\nu }}_e$ disappearance due to small active-sterile neutrino mixing obtained from the combined analysis of the data of the NEOS and DANSS reactor experiments.

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• Decaying Sterile Neutrinos and the Short Baseline Oscillation Anomalies
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• KATRIN bound on 3+1 active-sterile neutrino mixing and the reactor antineutrino anomaly
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• The Impact of Different Parameterizations on the Interpretation of CP Violation in Neutrino Oscillations
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• Restricting Sterile Neutrinos by Neutrinoless Double Beta Decay
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• Sterile neutrino searches at tagged kaon beams
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• Matter Effects of Sterile Neutrino in Light of Renormalization-Group Equations
• Impact of unitarity violation on sensitivity of the leptonic CP phase at Hyper-Kamiokande and DUNE
• Low-energy neutrino responses for 71Ga by electron capture rates, charge exchange reactions and shell model calculations