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[en] Nearly complete angular distributions of the two-body deuteron photodisintegration differential cross section have been measured using the CEBAF Large Acceptance Spectrometer detector and the tagged photon beam at the Thomas Jefferson National Accelerator Facility. The data cover photon energies between 0.5 and 3.0 GeV and center-of-mass proton scattering angles 10^o-160^o. The data show a persistent forward-backward angle asymmetry over the explored energy range, and are well described by the nonperturbative quark gluon string model

[en] This research deals with the application of stable isotope analyses to evaluate the most recent Poiano karst spring hydrogeological model proposed by Chiesi et al., 2010. The Poiano karst system is made up of Triassic ypsum/anhydrite evaporites outcropping in the northern part of the Apennine chain (Italy), and is bounded by the Lucola, Secchia, Sologno and Ozola rivers. According to the current hydrogeological model, this aquifer is mainly fed by the Lucola River. The Sologno River and meteoric recharge are believed to be secondary sources. The initial results from 46 water stable isotope analyses (d18O, dD) sampled monthly between Aug-2017 and May-2018 from the Poiano Spring, 3 shallow springs, and 15 river gauges were used as natural tracers to define the recharge shares for the Poiano karst system. The preliminary isotope results point out a new highlight with respect to the recognized hydrological model. The d18O-dD analysis shows a scarce isotopic affinity of the Poiano Spring with the Lucola River, a strong isotopic affinity of the Poiano Spring with the Secchia River, and a moderate isotopic affinity among the Sologno River, Ozola River and shallow springs (effective recharge). These results are not in line with the most recent hydrogeological model of the Poiano karst spring and they can use to define a new hydrogeological model. In particular, the isotopic analysis indicate that the Secchia River must be considered one of the main sources that contributes to the total discharge of the Poiano Spring.

[en] The ALICE Experiment (A Large Ion Collider Experiment) aims to study the properties of quark-gluon matter using Pb-Pb collisions at a center of mass energy (per nucleon pair) of ?s_NN = 5.5 TeV using the Large Hadron Collider (LHC) at CERN. The ALICE detector is composed of two separate parts: the main, central rapidity spectrometer to measure hadrons, electrons, and photons, and a forward rapidity spectrometer to measure muons. The central part comprises a large solenoidal magnet (from the L3 experiment) with Inner Tracker System (ITS), Time Projection Chamber (TPC), Time of Flight (TOF), Ring Imaging Cherenkov (RICH), Transition Radiation Detector (TRD) to measure hadrons and electrons, and the high resolution PHOton Spectrometer (PHOS) to measure photons and electrons. The ALICE EMCAL project consists in the addition to the existing detectors, of large area electromagnetic calorimeter to extend the measured momentum range and acceptance by over an order of magnitude for photons and electrons and to enhance the capability of ALICE to perform better jet reconstruction by measurement of the neutral energy component of the jets, photons and neutral pions. Additionally, the calorimeter will produce a fast high PT trigger in ALICE. The anticipated minimum bias average Pb-Pb interaction rate is very high (around 8 kHz), thus a fast high P_T trigger will provide an enhancement in high P_T events in central collisions. The EMCAL covers a kinematical region from -0.7?η?0.7 (in pseudo-rapidity η) and 120^o in the azimuthal angle Φ. In particular, the Φ-coverage of the EMCAL has been chosen to allow the detection of γ-jet events in coincidence with the PHOS. The EMCAL is a modular sampling calorimeter: it can measure showers up to 18 radiation lengths. Each module is composed by 4 towers of a Pb-scintillator sandwich. The shape of the basic module is tapered to allow a projective geometry of the final assembly with respect to the interaction point. An assembly of 12x24 modules is called a super-module. The complete EMCAL is a high granularity detector containing 11 super modules for a total of 12.672 towers. An independent optical readout of each tower is provided using wavelength shifting fibers coupled to an APD (Avalanche Photo Diod). The APD readout was chosen since the EMCAL has to operate in a high B-field environment created by the solenoidal magnet. The gain of the APD is monitored using LED activated scintillator installed on into each module. The ALICE EMCAL is a second-generation high priority detector. The first super-module will be ready for the end of 2007 when the first LHC beam is delivered to ALICE. By the end of 2009, during the LHC shutdown, six modules of the EMCAL will be installed into ALICE in order to be ready for the first Pb-Pb production runs. (Full Text)

[en] The ALICE Experiment (A Large Ion Collider Experiment) aims to study the properties of quark-gluon matter using Pb-Pb collisions at a center of mass energy (per nucleon pair) of □s_NN = 5.5 TeV with the Large Hadron Collider (LHC) at CERN. The EMCal consists in a large area electromagnetic calorimeter able to extend the measured momentum range of photons and electrons by over an order of magnitude. In addition, the EMCal will enhance the capability of the overall ALICE setup to perform better jet reconstruction by measurement of the neutral energy component of jets, photons and neutral pions. The EMCal will also produce a fast high-_pT trigger: the anticipated minimum bias average Pb-Pb interaction rate is very high (around 8 kHz), thus a fast high-_pT trigger will provide an enhancement in high _pT events in central collisions. The EMCal covers a geometrical region from -0.7≤η≤0.7 (in pseudo-rapidity η) and 120⁰ in the azimuthal angle φ. In particular, the φ-coverage has been chosen to allow the detection of γ-jet events in coincidence with the other ALICE complementary calorimeter, the PHOS. The EMCal is a modular sampling calorimeter: it can measure showers up to 20 radiation lengths. Each module is composed by 4 towers of a Pb-scintillator sandwich (shashlik). The shape of the basic module is tapered to allow a projective geometry of the final assembly with respect to the interaction point. An assembly of 12x24 modules is called a super-module. The complete EMCal is a high granularity detector containing 11 super modules for a total of 12.672 towers. An independent optical readout of each tower is provided using wavelength shifting fibers coupled to an APD (Avalanche Photo Diod). The APD readout was chosen to allow the operation in the high B-field environment created by the ALICE solenoidal magnet. The gain of the APD is monitored using a LED activated scintillator installed on into each module.

[en] The high-energy two-body deuteron break-up is a very well-suited process to identify quark effects in nuclei. In particular, its study in the few GeV region can clarify the transition from the nucleonic to the QCD picture of hadrons. The CEBAF Large Angle Spectrometer (CLAS) at JLab allowed for the first time the complete measurement of the angular distributions of the two-body deuteron photodisintegration differential cross-section at photon energies from 0.5 to 2.95 GeV. First results from the analysis of 30% of the total collected data show persistent forward-backward asymmetry and are well described by a calculation derived in the non-perturbative framework of the Quark Gluon String Model (QGSM). (orig.)

[en] Through analysis of the ¹³C NMR spectra of (25S)-[27-²H]campesterol (1) and (25R)-[26-²H]dihydrobrassicasterol (2), the C-26 and C-27 resonances have been unambiguously assigned; the biosynthetic applications are discussed. (author)

[en] ALICE (A Large Ion Collider Experiment) is an experiment at the CERN LHC (Large Hadron Collider) studying the physics of strongly interacting matter and the quark-gluon plasma.The experiment operation requires a 24 hours a day and 7 days a week shift crew at the experimental site, composed by the ALICE collaboration members. Shift duties are calculated for each institute according to their correlated members. In order to ensure the full coverage of the experiment operation as well as its good quality, the ALICE Shift Accounting Management System (SAMS) is used to manage the shift bookings as well as the needed training. ALICE SAMS is the result of a joint effort between the Federal University of Rio de Janeiro (UFRJ) and the ALICE Collaboration. The Glance technology, developed by the UFRJ and the ATLAS experiment, sits at the basis of the system as an intermediate layer isolating the particularities of the databases.In this paper, we describe the ALICE SAMS development process and functionalities. The database has been modelled according to the collaboration needs and is fully integrated with the ALICE Collaboration repository to access members information and respectively roles and activities. Run, period and training coordinators can manage their subsystem operation and ensure an efficient personnel management. Members of the ALICE collaboration can book shifts and on-call according to pre-defined rights.ALICE SAMS features a user profile containing all the statistics and user contact information as well as the Institutes profile. Both the user and institute profiles are public (within the scope of the collaboration) and show the credit balance in real time. A shift calendar allows the Run Coordinator to plan data taking periods in terms of which subsystems shifts are enabled or disabled and on-call responsible people and slots. An overview display presents the shift crew present in the control room and allows the Run Coordination team to confirm the presence of both regular and trainees shift personnel, necessary for credit accounting. (paper)

[en] The measurement of the response of the large-angle electromagnetic shower calorimeter (LAC) of the CLAS detector to minimum ionizing particles is reported. The experimental set-up and the adopted procedures are described. The results of the light attenuation length in the calorimeter, the light output and the resolution of the interaction point reconstruction are discussed. The performances of the LAC match well with those required

[en] A comprehensive understanding of bedrock lithology and groundwater circulation is necessary to identify areas prone to landslide initiation and reactivation. This necessity is particularly required in the case of outcroppings of weak rocks such as gypsum that, due to their high solubility and low mechanical strength, can promote slope deformation with the development of caves and collapses. In the Upper Secchia River Valley, where gypsum outcrops extensively and is covered by landslide deposits, an accurate identification of the gypsum outcrops and their distribution is needed to reduce the damage to urbanized slopes. In this paper, a hydrologic and geochemical approach is used in the Montecagno landslide to identify the origin, flow paths and transit time of groundwater circulating inside the landslide body and to identify gypsum deposits and their distribution in the bedrock. The results of groundwater-level monitoring, δ¹⁸O-δ²H and ³H isotope analyses and FLOWPC modelling suggest a local and recent origin of the groundwater hosted in shallow flow paths inside the landslide. Chemical and isotope (⁸⁷Sr/⁸⁶Sr, δ¹¹B) analyses offer evidence of the presence inside the landslide of small blocks of gypsum that, due to their dimensions, probably have a minor influence on landslide stability. This research demonstrates that the methodology used can provide satisfactory information about bedrock structures and their hydrological aspects.