G. Mandrioli

Hardware performance of a scanning system for high speed analysis of nuclear emulsions

The use of nuclear emulsions in very large physics experiments is now possible thanks to the recent improvements in the industrial production of emulsions and to the development of fast automated microscopes. In this paper the hardware performances of the European Scanning System (ESS) are described. The ESS is a very fast automatic system developed for the mass scanning of the emulsions of the OPERA experiment, which requires microscopes with scanning speeds of � 20 cm 2 =h in an emulsion volume of 44mm thickness.

Q2 dependence of the proton and neutron structure functions from neutrino and antineutrino scattering in deuterium

Abstract12,100 νD and 10,500

Energy losses of magnetic monopoles and dyons in scintillators, streamer tubes and nuclear track detectors

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Electron/pion separation with an emulsion cloud chamber by using a neural network.

charged current interactions in deuterium measured in the BEBC bubble chamber were used to obtain the complete set of structure functions of proton and neutron. Thex andQ2 dependence of the structure functions of up and down valence quarks and antiquarks are presented and discussed. The Adler and Gross-Llewellyn Smith sum rules have been tested at differentQ2 values. A QCD analysis of the four non singlet structure functionsxF3νN,xuv,xdv andF2νn−F2νp has been performed yielding values ofΛLO between 100 and 300 MeV.

SEARCH FOR A DELTA(1236)-DELTA(1236) STRUCTURE OF THE DEUTERON

Abstract Six stacks of CR39 [(C12H18O7)n, a Registered Trade Mark of PPG Industries, Inc.] nuclear track detectors with different targets were exposed to a lead ion beam of 158 A GeV at the CERN-SPS, at normal incidence, in order to study the fragmentation properties of ultra-relativistic lead nuclei. Measurements of the total, break-up and pick-up charge-changing cross sections of 158 A GeV Pb ions have been made for the first time.

Bose-Einstein correlations in neutrino and antineutrino interactions in deuterium

A systematic analysis of the energy losses of magnetic monopoles of different magnetic charges and of dyons in three types of detectors are investigated for a large range of β = υc (β > 10−5). More specifically we have computed the light yield in liquid scintillators, the ionization in streamer tubes and the Restricted Energy Loss in the CR39 nuclear track detectors. Also the total energy losses have been analyzed.

Production of neutral strange particles in and νμd2 charged current interactions

The OPERA experiment, designed to conclusively prove the existence of ????? oscillations in the atmospheric sector, makes use of a massive lead-nuclear emulsion target to observe the appearance of ??s in the CNGS ?? beam. The location and analysis of the neutrino interactions in quasi real-time required the development of fast computer-controlled microscopes able to reconstruct particle tracks with sub-micron precision and high efficiency at a speed of ~20 cm2/h. This paper describes the performance in particle track reconstruction of the European Scanning System, a novel automatic microscope for the measurement of emulsion films developed for OPERA.

Charged Hadron Multiplicities in High-energy Anti-muon Neutrino

We have studied the performance of a new algorithm for electron/pion separation in an Emulsion Cloud Chamber (ECC) made of lead and nuclear emulsion films. The software for separation consists of two parts: a shower reconstruction algorithm and a Neural Network that assigns to each reconstructed shower the probability to be an electron or a pion. The performance has been studied for the ECC of the OPERA experiment [1]. The e/π separation algorithm has been optimized by using a detailed Monte Carlo simulation of the ECC and tested on real data taken at CERN (pion beams) and at DESY (electron beams). The algorithm allows to achieve a 90% electron identification efficiency with a pion misidentification smaller than 1% for energies higher than 2 GeV.