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Nuclear Theory·nucl-th

Monday·December 7, 2015

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    On Quasibound N* Nuclei

    N. G. Kelkar🇨🇴 · D. Bedoya Fierro · P. Moskal🇵🇱

    The possibility for the existence of unstable bound states of the S11 nucleon resonance N(1535) and nuclei is investigated. These quasibound states are speculated to be closely related to the existence of the quasibound states of the eta mesons and nuclei. Within a simple model for the N N interaction involving a pion and eta meson exchange, N-nucleus potentials for N*-He and N*-Mg are evaluated and found to be of a Woods-Saxon like form which supports two to three bound states. In case of N*-He, one state bound by only a few keV and another by 4 MeV is found. The results are however quite sensitive to the N N and N N vertex parameters. A rough estimate of the width of these states, based on the mean free path of the exchanged mesons in the nuclei leads to very broad states with 80 and 110 MeV for N*-He and N*-Mg respectively.

    nucl-thnucl-exActa Phys.Polon.B(2016)·12 citations
  2. 02

    Moving forward to constrain the shear viscosity of QCD matter

    Gabriel Denicol🇺🇸 · Akihiko Monnai🇺🇸 · Bjoern Schenke🇺🇸

    We demonstrate that measurements of rapidity differential anisotropic flow in heavy ion collisions can constrain the temperature dependence of the shear viscosity to entropy density ratio {\eta}/s of QCD matter. Comparing results from hydrodynamic calculations with experimental data from RHIC, we find evidence for a small {\eta}/s 0.04 in the QCD cross-over region and a strong temperature dependence in the hadronic phase. A temperature independent {\eta}/s is disfavored by the data. We further show that measurements of the event-by-event flow as a function of rapidity can be used to independently constrain the initial state fluctuations in three dimensions and the temperature dependent transport properties of QCD matter.

    nucl-thhep-phnucl-exPRL(2016)·101 citations

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