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We present the development and application of a generic analysis scheme forthe measurement of neutrino spectra with the IceCube detector. This scheme isbased on regularized unfolding, preceded by an event selection which uses aMinimum Redundancy Maximum Relevance algorithm to select the relevant variablesand a Random Forest for the classification of events. The analysis has beendeveloped using IceCube data from the 59-string configuration of the detector.27,771 neutrino candidates were detected in 346 days of livetime. A rejectionof 99.9999% of the atmospheric muon background is achieved. The energy spectrumof the atmospheric neutrino flux is obtained using the TRUEE unfolding program.The unfolded spectrum of atmospheric muon neutrinos covers an energy range from100 GeV to 1 PeV. Compared to the previous measurement using the detector inthe 40-string configuration, the analysis presented here, extends the upper endof the atmospheric neutrino spectrum by more than a factor of two, reaching anenergy region that has not been previously accessed by spectral measurements.

Development of a General Analysis and Unfolding Scheme and its Application to Measure the Energy Spectrum of Atmospheric Neutrinos with IceCube