Abstract

SuperKamiokande (SK) doped with gadolinium has the capability to efficiently identify electron-antineutrinos through inverse beta-decay. Given the size of SK and the number of nuclear reactors in its vicinity, we argue that SK can observe the oscillations of reactor antineutrinos driven by the so-called solar mass-squared difference Δm212. After only one year of data taking, we estimate that SK can measure Δm212 with enough precision to help inform the current small tension between existing results from KamLAND and solar neutrino experiments.

Highlights

  • Our understanding of neutrino oscillations continues to evolve rapidly

  • With different sources and detector technologies, provide information on different subsets of oscillation parameters. ∆m231, for example, is constrained by measurements of neutrinos produced in accelerators, the atmosphere, and nuclear reactors, and make use of baselines that range from 1 km to 10,000 km

  • The fact that these different experiments point to the same range of values for ∆m231, along with the mixing parameters sin2 θ13 and sin2 θ23, serves as evidence that our current understanding of the neutrino sector is at least an excellent approximation of nature

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Summary

Introduction

Our understanding of neutrino oscillations continues to evolve rapidly. Five out of the six oscillation parameters – sin2 θ12, sin2 θ13, sin2 θ23, ∆m221, and ∆m231, following the PDG parameterization [1] – are known at the few to several percent level (see, for example, [2]) and there is growing nontrivial information on the sixth parameter – the CP-odd phase δ – and the neutrino-mass ordering, which are among the main targets of the current and generation of long-baseline oscillation experiments. All information on the solar parameters comes from experiments that measure the solar neutrino flux and from the very-long-baseline reactor antineutrino experiment KamLAND.

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