Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 8: Neutrino astronomy I

T 8.6: Talk

Monday, March 30, 2020, 17:50–18:05, H-HS VI

Study of double cascade sensitivity in IceCube-Gen2 — •Fuyudi Zhang for the IceCube collaboration — DESY, Zeuthen

The IceCube Neutrino Observatory is a cubic kilometer in-ice Cherenkov detector located at the South Pole. At high energies, the neutrino flux of ν_e : ν_µ : ν_τ is expected to be observed in the ratio of 1 : 1 : 1 on Earth. A ternary particle identification technique on the basis of three event topologies, single cascades, double cascades, and tracks, has been developed. While tracks arise mainly from charged-current muon neutrino interactions, single cascades from neutral-current interactions of all neutrino flavors and many charge-current interactions of ν_e. Double cascades arise from ν_τ charged-current interactions and subsequent non-muonic decay of the taus if the decay length is large enough to be resolved (E > ∼ 100 TeV). Such double cascades are unique to tau neutrinos and can be used to identify them. The next-generation neutrino observatory, IceCube-Gen2 will have an instrumented volume nearly 10 times greater than IceCube and a different geometry with larger string spacing. In this work I will present a study to estimate the double cascade identification efficiency in IceCube-Gen2, by analyzing the IceCube high-energy starting event sample but only using a subset of the optical sensors that is similar in layout to the future IceCube-Gen2 geometry.