Prompt directional detection of galactic supernova by combining large liquid scintillator neutrino detectors

Abstract

Core-collapse supernovae produce an intense burst of electron antineutrinos in the few-tens-of-MeV range. Several Large Liquid Scintillator-based Detectors (LLSD) are currently operated worldwide, being very effective for low energy antineutrino detection through the Inverse Beta Decay (IBD) process. In this article, we develop a procedure for the prompt extraction of the supernova location by revisiting the details of IBD kinematics over the broad energy range of supernova neutrinos. Combining all current scintillator-based detector, we show that one can locate a canonical supernova at 10 kpc with an accuracy of 45 degrees (68% C.L.). After the addition of the next generation of scintillator-based detectors, the accuracy could reach 12 degrees (68% C.L.), therefore reaching the performances of the large water Cerenkov neutrino detectors. We also discuss a possible improvement of the SuperNova Early Warning System (SNEWS) inter-experiment network with the implementation of a directionality information in each experiment. Finally, we discuss the possibility to constrain the neutrino energy spectrum as well as the mass of the newly born neutron star with the LLSD data

25 pages, 21 figures, accepted for Publication in Journal of Cosmology and Astroparticle Physics (JCAP); v2 with added references, corrected typos and errors in Section 6; v3 is the published version

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• Triangulation Pointing to Core-Collapse Supernovae with Next-Generation Neutrino Detectors
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• First Detailed Calculation of Atmospheric Neutrino Foregrounds to the Diffuse Supernova Neutrino Background in Super-Kamiokande
• Theoretical developments in supernova neutrino physics : mass corrections and pairing correlators
• Triangulating Black Hole Forming Stellar Collapses through Neutrinos
• Status and Perspectives of Neutrino Physics