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      Jet tomography of quark gluon plasma

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      Publication date (Print):
      Journal: Brazilian Journal of Physics
      Publisher: Sociedade Brasileira de Física

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          Abstract

          Recent experimental measurements of high pT hadron spectra and jet correlation at RHIC are analyzed within a parton model which incoporates initial jet production and final propagation in heavy-ion collisions. The suppre-sion of single hadron spectra, back-to-back correlation, their centrality dependence and azimuthal anisotropy point to a dense matter with an initial parton density about 30 times of that in a cold heavy nucleus.

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          Most cited references26

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          Photo-induced charge transfer across the interface between organic molecular crystals and polymers

          M. Gershenson, V. Podzorov (2004)
          Photo-induced charge transfer of positive and negative charges across the interface between an ordered organic semiconductor and a polymeric insulator is observed in the field-effect experiments. Immobilization of the transferred charge in the polymer results in a shift of the field-effect threshold of polaronic conduction along the interface in the semiconductor, which allows for direct measurements of the charge transfer rate. The transfer occurs when the photon energy exceeds the absorption edge of the semiconductor. The direction of the transverse electric field at the interface determines the sign of the transferred charge; the transfer rate is controlled by the field magnitude and light intensity.
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            Caustic activation of rain showers

            Vlad Bezuglyy, Bernhard Mehlig, Michael Wilkinson (2006)
            We show quantitatively how the collision rate of droplets of visible moisture in turbulent air increases very abruptly as the intensity of the turbulence passes a threshold, due to the formation of fold caustics in their velocity field. The formation of caustics is an activated process, in which a measure of the intensity of the turbulence, termed the Stokes number St, is analogous to temperature in a chemical reaction: the rate of collision contains a factor exp(-C/St). Our results are relevant to the long-standing problem of explaining the rapid onset of rainfall from convecting clouds. Our theory does not involve spatial clustering of particles.
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              The ferroelectric-paraelectric phase transition in BiFeO3: crystal structure of the orthorhombic beta-phase

              Donna C. Arnold, Philip Lightfoot, Finlay Morrison … (2008)
              A detailed investigation using variable temperature powder neutron diffraction demonstrates that BiFeO3 undergoes a phase transition from the ferroelectric alpha phase (rhombohedral, R3c) to a paraelectric beta phase (orthorhombic, Pbnm) between 820 oC and 830 oC. Co-existence of both phases over a finite temperature interval, together with abrupt changes in key structural parameters, confirm that the transition is firstorder. The beta phase corresponds to the GdFeO3-type perovskite. The metastability of BiFeO3 relative to Bi2Fe4O9 above 810 oC precludes observation of a reported cubic gamma phase above 925 oC under the present experimental conditions.
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                Author and article information

                Contributors
                Xin-Nian Wang: Role: ND
                Journal
                Journal ID (publisher): bjp
                Title: Brazilian Journal of Physics
                Abbreviated Title: Braz. J. Phys.
                Publisher: Sociedade Brasileira de Física (São Paulo )
                ISSN: 1678-4448
                Publication date (Print): December 2004
                Volume: 34
                Issue: 4a
                Pages: 1288-1294
                Article
                Publisher ID: S0103-97332004000700003
                DOI: 10.1590/S0103-97332004000700003
                SO-VID: 288a7069-b544-4a06-b1bc-a76ce70a268d
                License:

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0103-9733&lng=en
                Categories
                Subject: PHYSICS, MULTIDISCIPLINARY

                ScienceOpen disciplines: General physics
                Data availability:
                ScienceOpen disciplines: General physics

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