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.

References in corpus (6)

• The Reactor Antineutrino Anomaly
• Measurement of the solar neutrino capture rate with gallium metal. III: Results for the 2002--2007 data-taking period
• Statistical Significance of the Gallium Anomaly
• Sterile neutrino search at NEOS Experiment
• Limits on nu_e and anti-nu_e disappearance from Gallium and reactor experiments
• Short-Baseline Active-Sterile Neutrino Oscillations?

Cited by in corpus (8)

• Sterile Neutrinos
• The Future of Solar Neutrinos
• Bound on 3+1 active-sterile neutrino mixing from the first four-week science run of KATRIN
• Gallium Anomaly: Critical View from the Global Picture of ${\nu }_e$ and ${\bar{\nu }}_e$ Disappearance
• Two sides of the same coin: sterile neutrinos and dark radiation. Status and perspectives
• The Sun: Light Dark Matter and Sterile Neutrinos
• Light, Unstable Sterile Neutrinos: Phenomenology, a Search in the IceCube Experiment, and a Global Picture
• The gallium anomaly reassessed using a Bayesian approach