1,722,236 research outputs found
Identified charged hadron production in pp and Pb-Pb collisions with the ALICE experiment at the LHC
No full textThe ALICE experiment allows to study hadron production over a wide range of momenta exploiting the performance and capabilities of its dedicated detectors. In this report, the particle-identification detectors and techniques are shortly reviewed. The most recent results on the identified charged hadron spectra and ratios obtained in Pb-Pb collisions at √sNN=2.76 TeV and pp collisions at √s=7 TeV and √s=0.9 TeV are presented. In particular, particle production yields, spectral shapes in transverse momentum (pT) and particle ratios in proton-proton collisions are presented as a function of the collision energy, compared to previous experiments and commonly used Monte Carlo models. Particle pT spectra, yields and ratios in Pb-Pb are measured as a function of the collision centrality and the results are compared with available RHIC data. © 2012 American Institute of Physics
Light (Hyper-)Nuclei production at the LHC measured with ALICE
Full text linkThe high center-of-mass energies delivered by the LHC during the last three years of operation led to accumulate a significant statistics of light (hyper-)nuclei in pp, p--Pb and Pb--Pb collisions. The ALICE apparatus allows for the detection of these rarely produced particles over a wide momentum range thanks to its excellent vertexing, tracking and particle identification capabilities. The last is based on the specific energy loss in the Time Projection Chamber and the velocity measurement with the Time-Of-Flight detector. The Cherenkov technique, exploited by a small acceptance detector (HMPID), has also been used for the most central Pb--Pb collisions to identify (anti-)deuterons at intermediate transverse momentum.\\ Results on the production of stable nuclei and anti-nuclei in pp, p--Pb and Pb--Pb collisions are presented. Hypernuclei production rates in Pb--Pb are also described, together with a measurement of the hypertriton lifetime. The results are compared with the predictions from thermal and coalescence models. Moreover the results on the search for weakly-decaying light exotic states, such as the (H-dibaryon) and the -neutron bound states are discussed.The high center-of-mass energies delivered by the LHC during the last three years of operation led to accumulate a significant statistics of light (hyper-)nuclei in pp, p--Pb and Pb--Pb collisions. The ALICE apparatus allows for the detection of these rarely produced particles over a wide momentum range thanks to its excellent vertexing, tracking and particle identification capabilities. The last is based on the specific energy loss in the Time Projection Chamber and the velocity measurement with the Time-Of-Flight detector. The Cherenkov technique, exploited by a small acceptance detector (HMPID), has also been used for the most central Pb--Pb collisions to identify (anti-)deuterons at intermediate transverse momentum. Results on the production of stable nuclei and anti-nuclei in pp, p--Pb and Pb--Pb collisions are presented. Hypernuclei production rates in Pb--Pb are also described, together with a measurement of the hypertriton lifetime. The results are compared with the predictions from thermal and coalescence models. Moreover the results on the search for weakly-decaying light exotic states, such as the (H-dibaryon) and the -neutron bound states are discussed.The high center-of-mass energies delivered by the LHC during the last three years of operation led to accumulate a significant statistics of light (hyper-)nuclei in pp, p-Pb and Pb-Pb collisions. The ALICE apparatus allows for the detection of these rarely produced particles over a wide momentum range thanks to its excellent vertexing, tracking and particle identification capabilities. The last is based on the specific energy loss in the Time Projection Chamber and the velocity measurement with the Time-Of-Flight detector. The Cherenkov technique, exploited by a small acceptance detector (HMPID), has also been used for the most central Pb-Pb collisions to identify (anti-)deuterons at intermediate transverse momentum
Bios theoretikòs e bios praktikòs. Studi offerti a Fabio Minazzi per i suoi settant’anni
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Il fenomeno “singolare”. Husserl, Merleau-Ponty, Sartre: per una fenomenologia della corporeità
No full textGamma radiation measurements of naturally radioactive samples at INFN Bari laboratory
No full textHigh-resolution gamma-ray spectrometry is a widely used non-destructive measurement technique for the assessment of gamma-ray emitting radionuclides present in environmental samples. These measurements allow the evaluation of the radiological risk to the human beings and environment. The gamma radiation measurements laboratory, in the Physics Department of the University of Bari in collaboration with the Italian Institute for Nuclear Physics (INFN), is active since 2008. The laboratory is equipped with a an Ortec n-type coaxial high purity germanium (HPGe) detector.In this paper, an overview of the ongoing activities on gamma radiation measurements in our laboratory, will be given. These measurements are based on the precise knowledge of the absolute full energy-peak efficiency (FEPE) of the HPGe detector. The FEPE, evaluated using point and volume calibrated sources, will be presented and will be compared with the efficiency obtained using a dedicated software for gamma spectrometry (GammaVision and ANGLE). Furthermore, we present the efficiency calculated via Monte Carlo (GEANT4) simulation. We also describe a case study of gamma measurements application to the dating technique based on the Thermoluminescence (TL). A preliminary study on the evaluation of the gamma annual dose absorbed by TL dating samples, using GEANT4, will be described
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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