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A high-statistics measurement of the neutrinos from a galactic core-collapsesupernova is extremely important for understanding the explosion mechanism, andstudying the intrinsic properties of neutrinos themselves. In this paper, weexplore the possibility to constrain the absolute scale of neutrino masses$m^{}_\nu$ via the detection of galactic supernova neutrinos at the JiangmenUnderground Neutrino Observatory (JUNO) with a 20 kiloton liquid-scintillatordetector. In assumption of a nearly-degenerate neutrino mass spectrum and anormal mass ordering, the upper bound on the absolute neutrino mass is found tobe $m^{}_\nu < (0.83 \pm 0.24)~{\rm eV}$ at the 95% confidence level for atypical galactic supernova at a distance of 10 kpc, where the mean value andstandard deviation are shown to account for statistical fluctuations. Forcomparison, we find that the bound in the Super-Kamiokande experiment is$m^{}_\nu < (0.94 \pm 0.28)~{\rm eV}$ at the same confidence level. However,the upper bound will be relaxed when the model parameters characterizing thetime structure of supernova neutrino fluxes are not exactly known, and when theneutrino mass ordering is inverted.

Constraining Absolute Neutrino Masses via Detection of Galactic Supernova Neutrinos at JUNO