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Nuclear Theory·nucl-th

Monday·November 6, 2017

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 05

    Isospin Dependence of the EMC effect and Short range Correlations

    B. Schmookler🇺🇸 · M. Duer🇮🇱 · A. Schmidt🇺🇸 · S. Gilad🇺🇸 · L.B. Weinstein🇺🇸 · E. Piasetzky🇮🇱 · O. Hen🇺🇸

    Recent studies have shown that the per-nucleon number of Short-Range Correlated (SRC) pairs in nuclei and the strength of the EMC effect are linearly correlated, increasing from light nuclei up to iron and then saturating. This paper shows that the per-proton number of SRC pairs and the strength of the EMC effect are linearly correlated and increase from light to heavy asymmetric neutron-rich nuclei without saturation. These quantities, calculated per neutron, are also linearly related, but saturate (have constant value) remarkably early, starting with 12C. We propose that the observed phenomenological relationships indicate an isospin dependence of the EMC effect which is associated with the dominance of SRCs by neutron-proton pairs from 3He to heavy asymmetric neutron-rich nuclei.

    ↳ nucl-exnucl-th0 citations
  2. 06

    Cluster Expansion Model for QCD Baryon Number Fluctuations: No Phase Transition at

    Volodymyr Vovchenko🇩🇪 · Jan Steinheimer🇩🇪 · Owe Philipsen🇩🇪 · Horst Stoecker🇩🇪

    A Cluster Expansion Model (CEM), representing a relativistic extension of Mayer's cluster expansion, is constructed to study baryon number fluctuations in QCD. The temperature dependent first two coefficients, corresponding to the partial pressures in the baryon number and sectors, are the only model input, which we fix by recent lattice data at imaginary baryochemical potential. All other coefficients are constructed in terms of the first two and required to match the Stefan-Boltzmann limit at . The CEM allows calculations of the baryon number susceptibilities to arbitrary order. We obtain excellent agreement with available lattice data for the baryon fluctuation measures , , and predict higher order susceptibilities, that are not yet available from Lattice QCD. The calculated susceptibilities are then used to extract the radius of convergence of the Taylor expansion of the pressure. The commonly used ratio test fails due to the non-trivial asymptotic behavior of the Taylor coefficients. At the same time, a more elaborate estimator provides finite convergence radii at all temperatures and in agreement with the singularities of Padé approximants. The associated singularities lie in the complex -plane and appear smoothly connected to the Roberge-Weiss transition at high temperatures and imaginary chemical potential. No evidence for a phase transition at is found.

    ↳ hep-phhep-latnucl-thPRD(2018)·87 citations

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