PoS - Proceedings of Science
Volume 441 - XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023) - Neutrino Physics and Astrophysics
Pre-Supernova Alarm at Super-Kamiokande and Combined Monitoring with KamLAND
L.N. Machado*  on behalf of the Super-Kamiokande Collaboration and the KamLAND Collaboration
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Pre-published on: February 04, 2024
Published on: March 22, 2024
The Super-Kamiokande (SK) experiment is a neutrino observatory located in Japan. After the loading of gadolinium sulfate octahydrate to water in its detector, the SK experiment has entered a new phase, known as SK-Gd. This new phase is characterized by the significant improvement in the experiment's sensitivity to low energy electron anti-neutrinos, thus providing more reliable data for the study of neutrino sources and interactions. SK-Gd has the potential of detecting yet-unobserved neutrinos from the Diffuse Supernova Neutrino Background and pre-supernova (preSN) stars, which are massive stars at the last evolutionary stage before core-collapse supernova (CCSN). The main cooling mechanism of preSN stars is the neutrino emission through different thermal and nuclear processes such as pair annihilation and beta decay, emitting high fluxes of electron anti-neutrinos. The detection of preSN neutrinos would not only help determine the neutrino mass hierarchy, but it could also provide early warnings for nearby CCSNs. In October 2021, SK launched its pre-supernova alarm. We report the sensitivity of the Super-Kamiokande detector to preSN neutrinos and information regarding the alert system. A joint alarm with the KamLAND experiment was developed to improve the sensitivity of preSN neutrinos and extending the early warning to CCSN.
DOI: https://doi.org/10.22323/1.441.0210
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