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Poster communications

Offline performance studies and first real-time results on Core-Collapse Supernova neutrino searches with the KM3NeT neutrino detectors

Abstract : → Major breakthroughs in particle physics, astrophysics and nuclear physics from future observation of CCSN neutrinos! → Only 1-4 CCSN per century in our Galaxy, we do not want to miss the next one! The response of the KM3NeT detectors to CCSN neutrinos has been evaluated by means of a complete Monte Carlo simulation and an exhaustive study of the background from data. The detector performances are presented here. References [1] I. Tamborra et al., Phys. Rev. Lett. 111,121104 (2013) [2] KM3NeT Collaboration, Journal of Physics G 43 (8) (2016) [3] M. Ageron et al., arXiv:1906.02704 (2019) [physics.ins-det] [4] J.Miganda, arXiv:1609.04286 (2015) Core-collapse supernovae (CCSN) • Explosive phenomena can occur at the end of the life of massive stars. The explosion mechanism is not fully understood, but neutrinos play a fundamental role in it. • 99% of gravitational energy released through neu-trinos when photons cannot escape the star yet! • Single observation as of today: Only 24 neutrinos detected from SN1987A. Full simulation of the CCSN signal • State-of-the-art 3D simulations of three CCSN progenitors (with 27 M , 20 M and 11 M) provided by the Garching group are used for this study [1]. They only account for the accretion phase, with limited duration. • Time dependent CCSN neutrino spectrum: quasi-thermal distribution depending on the average neutrino energyẼ ν , the neutrino luminosity L(t) ν SN , the spectral pinching shape parameter α, and the SN distance. • The simulation output is used to compute the CCSN neutrino interaction rate in sea water. • Full Monte Carlo simulation of the detector response has been developed to estimate the expected detection rates. The KM3NeT neutrino detectors and the supernova neutrino signal
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M.Colomer Molla, A. Coleiro, D. Dornic, V. Kulikovskiy. Offline performance studies and first real-time results on Core-Collapse Supernova neutrino searches with the KM3NeT neutrino detectors. 36th International Cosmic Ray Conference (ICRC 2019), Jul 2019, Madison, United States. 2019. ⟨in2p3-02282737⟩

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