Dresden 2013 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 90: Neutrinoastronomie 5

T 90.8: Vortrag

Donnerstag, 7. März 2013, 18:30–18:45, HSZ-E03

Seasonal variations of atmospheric neutrinos observed with IceCube — •Kai Jagielski, Jan Blumenthal, Anne Schukraft, and Christopher Wiebusch — III. Physikalisches Institut, RWTH Aachen, D-52056 Aachen

The IceCube Neutrino Observatory located at the geographic South Pole measures atmospheric neutrinos produced by cosmic rays hitting the Earth’s atmosphere with a rate of several 10000 events per year. For the first time, it is observed that the rate of atmospheric neutrinos is correlated with the stratospheric temperature over Antarctica. This is in analogy to the seasonal variation of the atmospheric muon rate, which has previously been observed with much larger statistics of more than 100 billion events. Since the temperature correlation depends on the relative contribution of pions and kaons in air showers, the observation of seasonal variations provides the potential to measure the production ratio of pions to kaons. This ratio is not well-constrained by accelerator data in the relevant energy range and is a significant uncertainty for other IceCube analyses. Results from the analysis of neutrino data samples with a very low background contamination, measured with IceCube between 2008 and 2011, are presented.