770 research outputs found

    Symmetry Energy in Nuclear Surface

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    Interplay between the dependence of symmetry energy on density and the variation of nucleonic densities across nuclear surface is discussed. That interplay gives rise to the mass dependence of the symmetry coefficient in an energy formula. Charge symmetry of the nuclear interactions allows to introduce isoscalar and isovector densities that are approximately independent of the magnitude of neutron-proton asymmetry.Comment: 8 pages, 4 figures, contribution to 15th Nuclear Physics Workshop "Marie & Pierre Curie", Kazimierz, Poland, 2008; minor correction

    Symmetry Energy

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    Examination of symmetry energy is carried out on the basis of an elementary binding-energy formula. Constraints are obtained on the energy value at the normal nuclear density and on the density dependence of the energy at subnormal densities.Comment: 10 pages, 6 figures; talk given at the 3rd Argonne/MSU/INT/JINA RIA Theory Workshop, Argonne, April 4-7, 200

    Flow and the equation of state of nuclear matter

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    The status of flow in heavy-ion collisions and of inference of hadronic-matter properties is reviewed.Comment: 16 pages, 21 figures, talk given at the 7th Int. Conf. on Nucleus-Nucleus Collisions, NN2000, Strasbourg, France, July 3-7, 200

    Evidence for non-Gaussian tail in 3D pion emission source at the SPS

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    The NA49 experiment at CERN SPS has acquired a huge data set of Pb+Pb events over a broad range of energy and centrality during the last several years. This high statistics data set, coupled with a state-of-the-art analysis technique, allows for the first model-independent extraction and energy scan of 3D emission sources for pion pairs at SPS energies. These 3D pion emission sources provide new insights into the nature of a long-range source previously reported by PHENIX at RHIC. The new results indicate that the pion source displays significant non-Gaussian tails in the longitudinal direction at 40 and 158 AGeV and in the outward direction at 158 AGeV.Comment: Proceedings, QM06, Beijing, Chin

    Fragments in Gaussian Wave-Packet Dynamics with and without correlations

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    Generalization of Gaussian trial wave functions in quantum molecular dynamics models is introduced, which allows for long-range correlations characteristic for composite nuclear fragments. We demonstrate a significant improvement in the description of light fragments with correlations. Utilizing either type of Gaussian wave functions, with or without correlations, however, we find that we cannot describe fragment formation in a dynamic situation. Composite fragments are only produced in simulations if they are present as clusters in the substructure of original nuclei. The difficulty is traced to the delocalization of wave functions during emission. Composite fragments are produced abundantly in the Gaussian molecular dynamics in the limit ℏ→0\hbar \rightarrow 0.Comment: 22 pages, revtex, 6 postscript figure
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