The gallium anomaly revisited
Kostensalo, J., Suhonen, J., Giunti, C., & Srivastava, P. C. (2019). The gallium anomaly revisited. Physics Letters B, 795, 542-547. https://doi.org/10.1016/j.physletb.2019.06.057
Published inPhysics Letters B
© 2019 Published by Elsevier B.V. Funded by SCOAP3.
The gallium anomaly, i.e. the missing electron-neutrino flux from 37Ar and 51Cr 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 3.0σ to 2.3σ. This result is compatible with the recent indication in favor of short-baseline 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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Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThis work has been partially supported by the Academy of Finland under the Academy project no. 318043. J.K. acknowledges the financial support from Jenny and Antti Wihuri Foundation. We would like to thank Prof. K. Zuber for his suggestion to tackle this topic and Prof. H. Ejiri for enlightening discussions.
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