Abstract
A high-statistics measurement of the neutrinos from a galactic core-collapse supernova is extremely important for understanding the explosion mechanism, and studying the intrinsic properties of neutrinos themselves. In this paper, we explore the possibility to constrain the absolute scale of neutrino masses mν via the detection of galactic supernova neutrinos at the Jiangmen Underground Neutrino Observatory (JUNO) with a 20 kiloton liquid-scintillator detector. In assumption of a nearly-degenerate neutrino mass spectrum and a normal mass ordering, the upper bound on the absolute neutrino mass is found to be mν < (0.83 ± 0.24) eV at the 95% confidence level for a typical galactic supernova at a distance of 10 kpc, where the mean value and standard deviation are shown to account for statistical fluctuations. For comparison, we find that the bound in the Super-Kamiokande experiment is mν < (0.94 ± 0.28) eV at the same confidence level. However, the upper bound will be relaxed when the model parameters characterizing the time structure of supernova neutrino fluxes are not exactly known, and when the neutrino mass ordering is inverted.
Highlights
The neutrino burst from Supernova (SN) 1987A in the Large Magellanic Cloud was clearly recorded in the Kamiokande-II [1], Irvine-Michigan-Brookhaven (IMB) [2], and Baksan [3] experiments
We explore the possibility to constrain the absolute scale of neutrino masses mν via the detection of galactic supernova neutrinos at the Jiangmen Underground Neutrino Observatory (JUNO) with a 20 kiloton liquid-scintillator detector
In assumption of a nearly-degenerate neutrino mass spectrum and a normal mass ordering, the upper bound on the absolute neutrino mass is found to be mν < (0.83 ± 0.24) eV at the 95% confidence level for a typical galactic supernova at a distance of 10 kpc, where the mean value and standard deviation are shown to account for statistical fluctuations
Summary
The neutrino burst from Supernova (SN) 1987A in the Large Magellanic Cloud was clearly recorded in the Kamiokande-II [1], Irvine-Michigan-Brookhaven (IMB) [2], and Baksan [3] experiments. We have simulated a large number of experiments to study the statistical uncertainties of neutrino mass bound. We point out that both the starting time ts and the rising-time interval τr for neutrino emission have crucial impact on the neutrino mass bound If these two SN model parameters are set to be free, the upper bound will be relaxed to mν < (1.12 ± 0.33) eV for JUNO, and mν < (1.49 ± 0.42) eV for SK. We investigate the impact of model parameters on the mass bound, and consider the statistical uncertainty by simulating a large number of experiments.
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