Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 33: Cosmic Rays VI

T 33.4: Vortrag

Dienstag, 16. März 2021, 16:45–17:00, Th

Low-Energy Cosmic Ray Composition Spectra with IceCube and IceTop in Synergy — •Julian Saffer for the IceCube collaboration — Institute of Experimental Particle Physics, Karlsruhe Institute of Technology (KIT)

IceTop is the surface component of the IceCube South Pole Neutrino Observatory and dedicated to the indirect detection of cosmic rays (CRs). The recent implementation of a new trigger that only requires 2 of IceTop's 6 central infill stations hit by a CR-induced shower allowed to reduce the primary energy threshold for the detection of low-energy CRs from 1.6 PeV to 250 TeV. This lead to a narrowing of the gap between direct and indirect CR measurements and coverage of the entire `knee' region of the spectrum. [M. G. Aartsen et al. (IceCube Collaboration) Phys. Rev. D 102, 122001]

This talk presents the concept and performance of this new filter/trigger combination as well as reconstruction results for shower position, zenith angle and primary energy from Monte Carlo simulations and experimental data. Additionally, plans towards an enhancement of the machine learning techniques used for the determination of direction, primary energy and mass-composition of CRs are discussed. This will include the combination of the surface signals with the corresponding tracks of high-energetic muons within the deep in-ice detector.