Location: 50B-4205 (LBNL)
Speaker: Chang Hyon Ha (LBNL-NSD)
Title : Observation of Atmospheric Neutrino-Induced Cascades in IceCube with DeepCore
Abstract :The recently completed IceCube neutrino observatory is composed of more than 5,000 digital optical modules attached to 86 strings and buried in the South Pole ice. The observatory includes a tightly spaced inner array in the deepest ice, called DeepCore, which allows detection of low-energy neutrinos over a 4π solid angle with a giant surrounding cosmic ray muon veto. Designed to be sensitive to neutrinos at energies below 1 TeV, DeepCore collects a very high flux of atmospheric neutrinos which can be used to study neutrino flavor identification and oscillation physics. For the first time, atmospheric neutrino-induced cascades are observed in IceCube, using the 79-string detector with the DeepCore extension. Using 281 days of full data, 1029 events are observed of which 59% are predicted to be cascades. The first year performance of the detector, this observation, and future analyses are discussed in this presentation.