Gas Gain Uniformity Tests performed on Multi Wire Proportional Chambers for the LHCb Muon System

We present the experimental setup and the results of the gas gain uniformity tests performed as part of the quality control of the multiwire proportional chambers produced at CERN for the LHCb Muon system. The test provides a relative gas gain measurement over the whole chamber sensitive area. It is based on the analysis of the pulse height spectrum obtained when the chamber is exposed to {a^241}Am radioactive source. Since the measurement is normalized to the peak of a precise pulse generator, the gain uniformity can also be evaluated among different gas gaps and different chambers

Prompt K_short production in pp collisions at sqrt(s)=0.9 TeV

The production of K_short mesons in pp collisions at a centre-of-mass energy of 0.9 TeV is studied with the LHCb detector at the Large Hadron Collider. The luminosity of the analysed sample is determined using a novel technique, involving measurements of the beam currents, sizes and positions, and is found to be 6.8 +/- 1.0 microbarn^-1. The differential prompt K_short production cross-section is measured as a function of the K_short transverse momentum and rapidity in the region 0 < pT < 1.6 GeV/c and 2.5 < y < 4.0. The data are found to be in reasonable agreement with previous measurements and generator expectations.Comment: 6+18 pages, 6 figures, updated author lis

Performance of the neutron time-of-flight facility n_TOF at CERN

copyright The Author(s) 2013. This article is published with open access at Springerlink.comThe neutron time-of-flight facility n_TOF features a white neutron source produced by spallation through 20 GeV/c protons impinging on a lead target. The facility, aiming primarily at the measurement of neutron-induced reaction cross sections, was operating at CERN between 2001 and 2004, and then underwent a major upgrade in 2008. This paper presents in detail all the characteristics of the new neutron beam in the currently available configurations, which correspond to two different collimation systems and two choices of neutron moderator. The characteristics discussed include the intensity and energy dependence of the neutron flux, the spatial profile of the beam, the in-beam background components and the energy resolution/broadening. The discussion of these features is based on dedicated measurements and Monte Carlo simulations, and includes estimations of the systematic uncertainties of the mentioned quantities.Peer reviewedFinal Published versio

Measurement of sigma (pp -> bbX) at √s=7 TeV in the forward region

Decays of b hadrons into final states containing a D-0 meson and a muon are used to measure the bb; production cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. In the pseudorapidity interval 2 < eta < 6 and integrated over all transverse momenta we find that the average cross-section to produce b-flavoured or b-flavoured hadrons is (75.3 +/- 5.4 +/- 13.0) mu b

Species diversification – which species should we use?

Large detector systems for particle and astroparticle physics; Particle tracking detectors; Gaseous detectors; Calorimeters; Cherenkov detectors; Particle identification methods; Photon detectors for UV. visible and IR photons; Detector alignment and calibration methods; Detector cooling and thermo-stabilization; Detector design and construction technologies and materials. The LHCb experiment is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN (Geneva). The initial configuration and expected performance of the detector and associated systems. as established by test beam measurements and simulation studies. is described. © 2008 IOP Publishing Ltd and SISSA

Predictores de satisfacción laboral en médicos y enfermeros Predictors of job satisfaction among physicians and nurses

<abstract language="por">Os objetivos da presente investigação foram: (a) identificar estressores e estratégias de enfrentamento comumente empregadas por parte dos profissionais de saúde; (b) explorar as vinculações entre o estresse assistencial, o bem-estar e satisfação laboral; e (c) individualizar as variáveis explicativas da satisfação laboral assistencial. Foi realizada uma verificação empírica com uma amostra integrada por 196 profissionais argentinos (97 médicos e 99 enfermeiros). A amostra respondeu uma bateria desenvolvida para avaliar estressores, enfrentamento, bem-estar e satisfação laboral. Foram realizadas análises descritivas, correlacionais e de regressão múltipla. Os resultados obtidos indicaram que os estressores que mais afligem aos profissionais da saúde são a sobrecarga, a falta de apoio e a percepção de injustiça organizacional. Tanto a estratégia de resolução de problemas como a de distanciamento surgiram como potenciadoras de satisfação e bem-estar. As variáveis que melhor explicaram a satisfação laboral foram a intenção de permanecer no cargo, a quantidade de horas de trabalho semanal e o apoio do grupo familiar. São apresentadas sugestões para futuras investigações na área.<br>The objectives of this research were: (a) to identify the major stressors and the coping strategies commonly used by health professionals; (b) to explore the links among health care stressors, subjective wellbeing and job satisfaction; and (c) to individualize the explanatory variables of care job satisfaction. Empirical verification was conducted with a sample of 196 Argentinean professionals (97 doctors and 99 nurses). The sample answered a battery developed for assessing stress, coping, wellbeing, and work satisfaction. Data were subjected to descriptive, correlation, and multiple regression analysis. The results indicated that work overload, lack of support, and perceptions of organizational injustice are the main health care stressors. The employment of problem-solving and distancing coping emerged as the best strategies for enhancing job satisfaction and wellbeing. The perception of familiar support, more working hours, and the intention to stay were the variables that proved to be the best predictors of work satisfaction. Suggestions are made for future research in the area

Implications of Sm-151(n,gamma) cross section at n_TOF

The accurate knowledge of the Sm-151(n,gamma) cross section has important implications for the nuclear technologies as well as for fundamental studies. Due to its radioactivity, the only experimental data available on Sm-151 were derived from a transmission measurement [1]. Nowadays thanks to the innovative features of neutron time-of-flight facility (n_TOF), it was possible to measure Sm-151(n,gamma) cross section in a wide energy range and with good accuracy [2]. We present, here, the main experimental results together with the implications concerning the nuclear astrophysical part

Roadmap for selected key measurements of LHCb

379 pagesSix of the key physics measurements that will be made by the LHCb experiment, concerning CP asymmetries and rare B decays, are discussed in detail. The "road map" towards the precision measurements is presented, including the use of control channels and other techniques to understand the performance of the detector with the first data from the LHC

Road map for selected key measurements from LHCb

Six of the key physics measurements that will be made by the LHCb experiment, concerning CP asymmetries and rare B decays, are discussed in detail. The "road map" towards the precision measurements is presented, including the use of control channels and other techniques to understand the performance of the detector with the first data from the LHC.Six of the key physics measurements that will be made by the LHCb experiment, concerning CP asymmetries and rare B decays, are discussed in detail. The 'road map' towards the precision measurements is presented, including the use of control channels and other techniques to understand the performance of the detector with the first data from the LHC