P. Migliozzi

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.

The Synergy of the golden and silver channels at the neutrino factory

Abstract.We deepen the study of the so-called “silver channel”

Study of the eightfold degeneracy with a standard β-beam and a super-beam facility

\nu_e \to \nu_\tau

Sensitivity to θ13 of the CERN to Gran Sasso neutrino beam

[1] and of its relevance to solve some of the ambiguities that can arise in the simultaneous measurement of

Measurement of charm production in neutrino charged-current interactions

(\theta_{13},\delta)

Momentum measurement by the angular method in the Emulsion Cloud Chamber

at the Neutrino Factory by presenting in full detail the characteristics of the considered OPERA-like detector and the experimental treatment of the different backgrounds and signals. Furthermore, we perform a detailed study of the systematic errors associated both with the OPERA-like and the magnetized-iron detectors and their effects on the sensitivity. Finally, we also apply a refined statistical analysis of the simulated events based on the frequentist approach.

Detectors and flux instrumentation for future neutrino facilities

Abstract The study of the eightfold degeneracy at a neutrino complex that includes a standard β -beam and a super-beam facility is presented for the first time in this paper. The scenario where the neutrinos are sent toward a megaton water Cerenkov detector located at the Frejus laboratory (baseline 130 km) is exploited. The performance in terms of sensitivity for measuring the continuous ( θ 13 and δ ) and discrete ( sign [ Δ m 23 2 ] and sign [ tan ( 2 θ 23 ) ] ) oscillation parameters for the β -beam and super-beam alone, and for their combination has been studied. A brief review of the present uncertainties on the neutrino and antineutrino cross-sections is also reported and their impact on the discovery potential discussed.

The synergy of the golden and silver channels at the Neutrino Factory

The sensitivity of the present CNGS beam to the sub-dominant νμ ↔ νe oscillations in the region indicated by the atmospheric neutrino experiments is investigated. In particular, we present a revised analysis of the OPERA detector and discuss the sensitivity to θ13 of ICARUS and OPERA combined. We show that the CNGS beam optimized for ντ appearance will improve significantly (about a factor of 5) the current limit of CHOOZ and explore most of the region sin2 2θ13 (10−2).

High energy beta beams without massive detectors

The nuclear emulsion target of the CHORUS detector was exposed to the wide-band neutrino beam of the CERN SPS of 27 GeV average neutrino energy from 1994 to 1997. In total, about 100 000 charged-current (CC) neutrino interactions with at least one identified muon were located in the emulsion target and fully reconstructed, using newly developed automated scanning systems. Charmed particles were searched for by a program recognizing particle decays. The observation of the decay in nuclear emulsion makes it possible to select a sample with very low background and minimal kinematical bias. In all, 2013 CC interactions with a charmed hadron candidate in the final state were selected and confirmed through visual inspection. The charm production rate induced by neutrinos relative to the CC cross-section is measured to be σ(νμN→μ−CX)/σ(CC)=(5.75 ± 0.32(stat)±0.30(syst))%. The charm production cross-section as a function of neutrino energy is also obtained. The results are in good agreement with previous measurements. The charm-quark hadronization produces the following charmed hadrons with relative fractions (in %): fD0=43.7±4.5, fΛc+=19.2±4.2, fD+=25.3±4.2 and fDs+=11.8±4.7.

Track reconstruction in the emulsion-lead target of the OPERA experiment using the ESS microscope

We present the first automated momentum measurement in an Emulsion Cloud Chamber, consisting of multiple sandwiches of lead plates and nuclear emulsion sheets. The measurement is based on the detection of the multiple Coulombscattering analysed by the so-called angular method. A 3 X0 chamber was exposed to 2, 3 and 4 GeV=c p � : A pion momentum resolution of 36% at 4 GeV=c; 35% at 3 GeV=c and 28% for 2 GeV=c was achieved.