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The finite size of a neutrino wavepacket at creation can affect itsoscillation probability. Here, we consider the electron antineutrino wavepacketand decoherence in the context of the nuclear reactor based experiment JUNO.Given JUNO's high expected statistics [$\sim$100k IBD events ($\bar{\nu}_e p\rightarrow e^+ n$)], long baseline ($\sim$53\,km), and excellent energyresolution [$\sim$$0.03/\sqrt{E_{\mathrm{vis}}~\mathrm{(MeV)}}$], itssensitivity to the size of the wavepacket is expected to be quite strong.Unfortunately, this sensitivity may weaken the experiment's ability to measurethe orientation of the neutrino mass hierarchy for currently allowed values ofthe wavepacket size. Here, we report both the JUNO experiment's ability todetermine the hierarchy orientation in the presence of a finite wavepacket andits simultaneous sensitivity to size of the wavepacket and the hierarchy. Wefind that wavepacket effects are relevant for the hierarchy determination up tonearly two orders of magnitude above the current experimental lower limit onthe size, noting that there is no theoretical consensus on the expectation ofthis value. We also consider the effect in the context of other aspects ofJUNO's nominal three-neutrino oscillation measurement physics program and theprospect of future enhancements to sensitivity, including from precisemeasurements of $\Delta m^2_{3l}$ and a near detector.

Neutrino Decoherence and the Mass Hierarchy in the JUNO Experiment