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We discuss the ICARUS T600 detector capabilities in electromagnetic showerreconstruction through the analysis of a sample of 212 events, coming from the2001 Pavia surface test run, of hadronic interactions leading to the productionof $\pi^{0}$ mesons. Methods of shower energy and shower direction measurementswere developed and the invariant mass of the photon pairs was reconstructed.The ($\gamma$,$\gamma$) invariant mass was found to be consistent with thevalue of the $\pi^0$ mass. The resolution of the reconstructed $\pi^0$ mass wasfound to be equal to 27.3%. An improved analysis, carried out in order to cleanthe full event sample from the events measured in the crowded environment,mostly due to the trigger conditions, gave a $\pi^0$ mass resolution of 16.1%,significantly better than the one evaluated for the full event sample. Thetrigger requirement of the coincidence of at least four photomultiplier signalsfavored the selection of events with a strong pile up of cosmic ray tracks andinteractions. Hence a number of candidate $\pi^0$ events were heavilycontaminated by other tracks and had to be rejected. Monte Carlo simulations ofevents with $\pi^0$ production in hadronic and neutrino interactions confirmedthe validity of the shower energy and shower direction reconstruction methodsapplied to the real data.

Energy reconstruction of electromagnetic showers from $\pi^0$ decays with the ICARUS T600 Liquid Argon TPC