Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 67: Neutrino astronomy III

T 67.8: Talk

Wednesday, March 17, 2021, 17:45–18:00, Tq

Mean Supernova Neutrino Energy Reconstruction with IceCube — •David Kappesser and Lutz Köpke for the IceCube collaboration — Johannes Gutenberg-Universität, Mainz

The IceCube Neutrino Observatory is capable of detecting supernova neutrinos with energies around 10 MeV by observing a significant excess in the overall raw rate of the detector above noise rate. This method allows for a particularly precise measurement of the supernova neutrino lightcurve. Due to IceCube's sparse Instrumentation with Digital Optical Modules (DOMs), only in rare cases, more than one Cherenkov photon is detected per supernova neutrino interaction. Still, the number of coincidences is sufficiently large in order to estimate the average neutrino energy by analyzing the energy dependent rate increase of coincidences between neighbouring DOMs. A Geant4 based Monte Carlo was developed and tested to calibrate and evaluate such a measurement. Further Geant4 simulations were used to study the passage of positrons through ice, their production of secondary particles, and the Cherenkov photons being emitted. I will present a Likelihood approach for the analysis of this simulated data and to account for the different combinations of noise and supernova signal events leading to coincidences in the detector.