Measurement of the muon decay spectrum with the ICARUS liquid argon TPC

Examples are given which prove the ICARUS detector quality through relevant physics measurements. The authors study the μ decay energy spectrum from a sample of stopping μ events acquired during the test run of the ICARUS T600 detector. This detector allows the spatial reconstruction of the events with fine granularity, hence, the precise measurement of the range and dE/dx of the μ with high sampling rate. This information is used to compute the calibration factors needed for the full calorimetric reconstruction of the events.