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

A search for TeV to PeV muon neutrinos from unresolved sources was performed on AMANDA-II data collected between 2000 to 2003. The diffuse analysis sought to identify an extraterrestrial neutrino signal on top of the atmospheric muon and neutrino backgrounds. An upper limit of E2Φ90%C.L. < 8.8 × 10−8 GeV cm−2 s−1 sr−1 was placed on the diffuse flux of muon neutrinos with a dN/dE ~ E−2 spectrum for the energy range 15.8 TeV to 2.5 PeV. Limits were also placed on prompt and astrophysical neutrino models with other energy spectra.