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Nuclear Theory·nucl-th

Tuesday·July 21, 2015

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    [Submitted on 20 Jul 2015]

    Constraining the symmetry energy content of nuclear matter from nuclear masses: a covariance analysis

    C. Mondal · B. K. Agrawal · J. N. De

    Elements of nuclear symmetry energy evaluated from different energy density functionals parametrized by fitting selective bulk properties of few representative nuclei are seen to vary widely. Those obtained from experimental data on nuclear masses across the periodic table, however, show that they are better constrained. A possible direction in reconciling this paradox may be gleaned from comparison of results obtained from use of the binding energies in the fitting protocol within a microscopic model with two sets of nuclei, one a representative standard set and another where very highly asymmetric nuclei are additionally included. A covariance analysis reveals that the additional fitting protocol reduces the uncertainties in the nuclear symmetry energy coefficient, its slope parameter as well as the neutron-skin thickness in Pb nucleus by . The central values of these entities are also seen to be slightly reduced.

    Comments:
    6 pages, 2 figures, Accepted in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1507.05384 [pdf]
    PRC(2015)·38 citations
  2. 02

    [Submitted on 20 Jul 2015]

    Anti-shadowing Effect on Charmonium Production at a Fixed-target Experiment Using LHC Beams

    Kai Zhou🇨🇳 · Zhengyu Chen🇨🇳 · Pengfei Zhuang🇨🇳

    We investigate charmonium production in Pb+Pb collisions at LHC beam energy =2.76 A TeV at fixed-target experiment (=72 GeV). In the frame of a transport approach including cold and hot nuclear matter effects on charmonium evolution, we focus on the anti-shadowing effect on the nuclear modification factors and for the yield and transverse momentum. The yield is more suppressed at less forward rapidity (2) than that at very forward rapidity (4) due to the shadowing and anti-shadowing in different rapidity bins.

    Comments:
    7 pages, 3 figures; submitted to Advances in High Energy Physics. arXiv admin note: text overlap with arXiv:1409.5559
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1507.05413 [pdf]
    Adv.High Energy Phys.(2015)·3 citations
  3. 03

    [Submitted on 20 Jul 2015]

    Quantum Monte Carlo calculations of neutron matter with chiral three-body forces

    I. Tews🇩🇪 · S. Gandolfi🇺🇸 · A. Gezerlis🇨🇦 · A. Schwenk🇩🇪

    Chiral effective field theory (EFT) enables a systematic description of low-energy hadronic interactions with controlled theoretical uncertainties. For strongly interacting systems, quantum Monte Carlo (QMC) methods provide some of the most accurate solutions, but they require as input local potentials. We have recently constructed local chiral nucleon-nucleon (NN) interactions up to next-to-next-to-leading order (NLO). Chiral EFT naturally predicts consistent many-body forces. In this paper, we consider the leading chiral three-nucleon (3N) interactions in local form. These are included in auxiliary field diffusion Monte Carlo (AFDMC) simulations. We present results for the equation of state of neutron matter and for the energies and radii of neutron drops. In particular, we study the regulator dependence at the Hartree-Fock level and in AFDMC and find that present local regulators lead to less repulsion from 3N forces compared to the usual nonlocal regulators.

    Comments:
    10 pages, 8 figures, 1 table, published version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1507.05561 [pdf]
    PRC(2016)·185 citations
  4. 04

    [Submitted on 20 Jul 2015]

    Fluid dynamic propagation of initial baryon number perturbations on a Bjorken flow background

    Stefan Floerchinger🇨🇭 · Mauricio Martinez🇺🇸

    Baryon number density perturbations offer a possible route to experimentally measure baryon number susceptibilities and heat conductivity of the quark gluon plasma. We study the fluid dynamical evolution of local and event-by-event fluctuations of baryon number density, flow velocity and energy density on top of a (generalized) Bjorken expansion. To that end we use a background-fluctuation splitting and a Bessel-Fourier decomposition for the fluctuating part of the fluid dynamical fields with respect to the azimuthal angle, the radius in the transverse plane and rapidity. We examine how the time evolution of linear perturbations depends on the equation of state as well as on shear viscosity, bulk viscosity and heat conductivity for modes with different azimuthal, radial and rapidity wave numbers. Finally we discuss how this information is accessible to experiments in terms of the transverse and rapidity dependence of correlation functions for baryonic particles in high energy nuclear collisions.

    Comments:
    36 pages, 11 figures; v3: change in the format of the latex file. Minor changes in the text. Typos corrected and updated references. Tweak in Fig. 1-11. Accepted for publication in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1507.05569 [pdf]
    PRC(2015)·37 citations

Affiliations

first authorsco-authorsvia INSPIRE