Multi-year search for a diffuse flux of muon neutrinos with AMANDA-II

Astronomy and Astrophysics – Astrophysics

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Diffuse Flux, Muon, Neutrinos, Amanda-Ii

Scientific paper

Neutrinos are valuable messengers that are expected to help answer fundamental questions about our Universe, including the origin of cosmic rays and the nature of cosmic accelerators. Neutrino astrophysics may even open a window to processes or objects we have never yet imagined. The AMANDA-II detector was constructed to search for and identify distant neutrino sources with non- thermal components. This analysis of AMANDA-II data collected between February 2000 and November 2003 searches for a diffuse flux of TeV - PeV muon neutrinos from unresolved astrophysical sources across the entire northern sky. Since astrophysical neutrinos are expected to have a harder energy spectrum than the atmospheric muon and neutrino backgrounds, an energy-dependent parameter was used to separate the signal and background event classes. No excess of events was seen in the data over the expected background, therefore upper limits were placed on the diffuse flux of muon neutrinos based on several different astrophysical neutrino models. Because of their harder spectra, prompt atmospheric neutrino predictions were also tested and constrained.

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