Kavli Affiliate: Kai Martens
| First 5 Authors: KamLAND, Super-Kamiokande Collaborations, :, Seisho Abe, Minori Eizuka
| Summary:
Preceding a core-collapse supernova, various processes produce an increasing
amount of neutrinos of all flavors characterized by mounting energies from the
interior of massive stars. Among them, the electron antineutrinos are
potentially detectable by terrestrial neutrino experiments such as KamLAND and
Super-Kamiokande via inverse beta decay interactions. Once these pre-supernova
neutrinos are observed, an early warning of the upcoming core-collapse
supernova can be provided. In light of this, KamLAND and Super-Kamiokande have
been monitoring pre-supernova neutrinos since 2015 and 2021, respectively.
Recently, we performed a joint study between KamLAND and Super-Kamiokande on
pre-supernova neutrino detection. A pre-supernova alert system combining the
KamLAND detector and the Super-Kamiokande detector is developed and put into
operation, which can provide a supernova alert to the astrophysics community.
Fully leveraging the complementary properties of these two detectors, the
combined alert is expected to resolve a pre-supernova neutrino signal from a 15
M$_{odot}$ star within 510 pc of the Earth, at a significance level
corresponding to a false alarm rate of no more than 1 per century. For a
Betelgeuse-like model with optimistic parameters, it can provide early warnings
up to 12 hours in advance.
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