# The gallium anomaly revisited

## TL;DR

This paper reevaluates the gallium anomaly using advanced nuclear shell-model calculations, reducing its statistical significance and aligning it with recent short-baseline neutrino experiment findings.

## Contribution

It provides a new estimate of the gallium anomaly significance using improved nuclear cross-section calculations, lowering previous significance levels.

## Key findings

- Gallium anomaly significance reduced from 3.0σ to 2.3σ.
- Results align with short-baseline neutrino disappearance signals.
- Supports the sterile neutrino hypothesis with updated calculations.

## 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.