Electromagnetic Shower Reconstruction in Emulsion Cloud Chamber

Physics – Medical Physics

Scientific paper

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Scientific paper

Atmospheric neutrino data from the MACRO, Soudan II and Super-Kamiokande experiments are consistent with the hypothesis of νμ → ντ oscillations. The OPERA experiment aims to prove definitively this hypothesis with the direct observation of ντ neutrinos in the νμ beam produced at CERN (CNGS). The apparatus, in construction at the Gran Sasso Underground Laboratory, is equipped with electronic detectors and a sensitive target. The target is highly segmented in units, bricks, composed of alternate nuclear emulsion plates and lead sheets. An algorithm to reconstruct electromagnetic showers in a brick was developed. The algorithm was optimized using experimental data from 1, 3 and 6 GeV electron exposures and cross-checked with detailed Monte Carlo simulations. Finally, a neural network was used as electron/pion separator.

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