Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 93: Neutrinoastronomie II
T 93.6: Vortrag
Dienstag, 29. März 2011, 18:00–18:15, 30.41: 105
Measurement of Atmospheric Neutrino Oscillations with IceCube/DeepCore — •Sebastian Euler, Martin Bissok, Marius Wallraff, and Christopher Wiebusch — III. Physikalisches Institut, RWTH Aachen, D-52056 Aachen
IceCube’s low-energy optimization DeepCore became operational in May 2010 and is taking data since then. It lowers the energy threshold of IceCube by roughly an order of magnitude. The huge statistics of about 150000 triggered atmospheric muon neutrinos per year and the low energy threshold of about 10 GeV permit to study oscillations. The disappearance probability depends on the neutrino energy and the traveled distance and thus on the zenith angle observed by IceCube. Maximum disappearance is expected at energies of about 25 GeV for vertically upward going neutrinos. For shorter oscillation lengths this flux minimum shifts towards 1 GeV close to the horizon. This study aims for a likelihood analysis of the two experimental observables (zenith and neutrino energy) for a high statistics measurement of the mixing angle θ23 and the mass difference Δ m232. This talk presents the analysis method and first results from the data taken by IceCube in its 79-string configuration.