Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 46: Neutrino Astronomy 2

T 46.5: Vortrag

Dienstag, 22. März 2022, 17:15–17:30, T-H31

Seasonal Variations of the Atmospheric Neutrino Flux determined from 10 years of IceCube Data with DSEA+ — •Karolin Hymon and Tim Ruhe for the IceCube collaboration — Astroparticle Physics WG Rhode, TU Dortmund University, Germany

The IceCube Neutrino Observatory is a cubic-kilometer detector array at the South Pole. Beyond the detection of astrophysical neutrinos, the detector measures atmospheric neutrinos at a high rate. These atmospheric neutrinos originate from cosmic ray interactions in the upper atmosphere, mainly from the decay of pions and kaons. The rate of the measured neutrinos, however, is affected by seasonal temperature variations in the Stratosphere, and the variations are expected to increase with the particle's energy. The Dortmund Spectrum Estimation Algorithm (DSEA+) is a novel approach to spectrum unfolding. The ill-posed problem is transferred to a multinomial classification task, in which the energy distribution is estimated from measured quantities by machine learning algorithms. In this talk, the analysis approach to measure the spectral dependence of the seasonal neutrino flux will be presented. Seasonal neutrino energy spectra are determined by DSEA+, utilizing 10 years of IceCube's atmospheric muon neutrino data. The differences of the unfolded seasonal spectra will be compared to the unfolded annual mean flux.