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Developpement d'un systeme ultra rapide pour le scan des emulsions nucleaires d'OPERA et etude sur la localistion des vertex de l'interaction des neutrinos a l'aide de ce systeme

Abstract : Following SuperKamiokande and K2K experiments, OPERA (Oscillation Project with Emulsion tRacking Apparatus), aims to confirm neutrino oscillation in the atmospheric sector. Taking advantage of a technique already employed in CHORUS and in DONUT, the Emulsion Cloud Chamber (ECC), OPERA will be able to observe the nµ® nt oscillation, through the nt appearance in a pure nµ beam. The OPERA experiment, with its ~100000 m2 of nuclear emulsions, needs a very fast automatic scanning system. Optical and mechanics components have been customized in order to achieve a speed of about 20 cm2/hour per emulsion layer (44 μm thick), while keeping a sub-micrometric resolution.
The first part of this thesis was dedicated to the optimization of 4 scanning systems at the French scanning station, based in Lyon. An experimental study on a dry objective scanning system has also been realized. The obtained results show that the performances of dry scanning are similar with respect to the traditional oil scanning, so that it can be successfully used for OPERA.
The second part of this work was devoted to the study of the neutrino interaction location and reconstruction strategy actually used in OPERA. A dedicated test beam was performed at CERN in order to simulate OPERA conditions. The obtained results definitely confirm that the proposed strategy is well adapted for tau search.
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Submitted on : Thursday, May 29, 2008 - 3:19:44 PM
Last modification on : Tuesday, November 19, 2019 - 2:36:43 AM
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  • HAL Id : tel-00283267, version 1

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Luisa Arrabito. Developpement d'un systeme ultra rapide pour le scan des emulsions nucleaires d'OPERA et etude sur la localistion des vertex de l'interaction des neutrinos a l'aide de ce systeme. Physique des Hautes Energies - Expérience [hep-ex]. Université Claude Bernard - Lyon I, 2007. Français. ⟨tel-00283267⟩

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