No abstract available

[en] Binding materials with high gamma-absorbance, easy to prepare and use, are of great usefulness in the elimination and disposal of low-level radioactive wastes such as clinical wastes. Use of these materials ranges from construction of containers to sealing of vessels designed for wastes disposal. In this paper the authors describe preparation of special mortars containing barite and/or PbO characterized by good hydraulic properties and high insulating power

[en] A strategy for tagging muons with the Tile Calorimeter at the second level trigger (LVL2) of the ATLAS experiment is presented and its efficiency and mistagging fraction are discussed. It is demonstrated that the Tile Calorimeter can identify muons with good efficiency down to p_T=2 GeV/c where the stand-alone muon spectrometer has zero efficiency. A method of exploiting all information available at LVL2 to reduce spurious muon-tag and measure the candidate muon momentum is discussed. The effectiveness of this method is tested, in particular, in the case of bb-bar events at low Large Hadron Collider luminosity (10³³ cm^-1 s^-2) with full simulation of experimental conditions

[en] Green Mixtures of Raw Materials as a Metallurgical Slag (10% PbO) and Barite, in various proportions, were fired at temperatures of 1000 degrees C-1200 degrees C, in order to produce materials for Radioactive Wastes Vitrification. Density, firing shrinkage, chemical resistance and high energy radiations absorbance of the Glasses were investigated. It is then clear the possibility of preparation of useful materials by re-use of industrial wastes with polluting problems

[en] Among the observables used for the diagnostics of the hot and dense fireball formed in high energy nuclear collisions, lepton pairs are particularly attractive. In contrast to hadrons, they directly probe the entire space-time evolution of the fireball and freely escape from the interaction zone, undisturbed by final-state interactions. This talk will review the present understanding of thermal dilepton production from an experimental point of view focusing on the most recent measurements. A perspective on possible future measurements will be presented as well. (author)

[en] The NA60 experiment has studied low-mass muon pair production in proton-nucleus collisions with a system of Be, Cu, In, W, Pb and U targets using a 400 GeV/c proton beam at the CERN SPS. The mass spectrum is well described by the superposition of the two-body and Dalitz decays of the light neutral mesons η, ρ, ω, η^' and φ new measurement of the electromagnetic transition form factors of the η and ω was performed. The values found are Λ_η^-2=1.950±0.059(stat.)±0.042(syst.)(GeV/c²)^-2 and Λ_ω^-2=2.241±0.025(stat.)±0.028(syst.)(GeV/c²)^-2. They agree with the previous available measurements, improving their uncertainty thanks to the higher statistics, and confirm the discrepancy with the prediction of the Vector Meson Dominance model in the case of the electromagnetic form factor of the ω meson. The comparison of the data to an improved calculation including also a direct point-like term is discussed. The nuclear dependence of the production cross sections of the ω, ρ and φ mesons was also studied. An increase of the φ production with respect to the ω is observed from p-Be to p-U collisions. Parameterizing the nuclear dependence of the production cross sections with the power law σ_pA∝A^α, one finds α_ω=0.841±0.014(stat.)±0.030(syst.) and α_φ=0.906±0.011(stat.)±0.025(syst.). A possible bias induced by the use of the light Be target is found. If it is excluded, the results are α_ω=0.801±0.037(stat.)±0.041(syst.) and α_φ=0.963±0.026(stat.)±0.017(syst.), showing an increase of α_φ and a decrease of α_ω.

[en] The hadronic calorimeter of the ATLAS experiment at LHC, TileCal, is designed to reconstruct jets, tau-leptons and missing transverse energy. An overview of the calorimeter read-out electronics is given and upgrade plans for the High Luminosity LHC programme in 2024 are discussed. The R and D activities at the different institutes targeting different parts of the TileCal electronics are described, and the status of the first demonstrator prototype built to be installed during the LHC long shutdown in 2014 is summarized

[en] TileCal, the central hadronic section of the ATLAS Calorimeter, is a sampling calorimeter made of steel and scintillating tiles. The TileCal front-end electronics reads out about 10,000 photo-multipliers at 40 Msps measuring energies ranging from ≅ 30 MeV to ≅ 2 TeV. The read-out system is designed to provide the ATLAS High Level Trigger with reconstructed PMT signals within the time budget allowed by the First Level Trigger (LVL1) running at a maximum trigger rate of 75 KHz. The signal amplitude, time and a reconstruction quality factor are obtained for each PMT using optimal filtering techniques implemented in the Digital Signal Processors (DSP).

[en] The study of the I=1, 0⁺⁺ states with the OBELIX detector in the channel p-barp→K^±K_S⁰π^± at three different target densities is reported. We discuss in particular the initial state dependence of a₀(980) production and the evidence of an extra scalar state with mass 1.29±0.01 GeV/c² and width 0.080±0.005 GeV/c²

[en] The quality of wavelength shifting fibres depends on two basic parameters: the transparency of the core material, polystyrene, and the reflection coefficients at the fibre internal interfaces (core-clad and clad-clad in double-clad fibres). We have developed a model to parameterize these effects. The model has been applied to study the light attenuation in fibres used in the ATLAS hadronic calorimeter (TILE Calorimeter), as well as in the ones produced by several firms