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Nuclear Theory·nucl-th

Friday·October 23, 2015

6 papers—5 primary·1 cross-listed

All6Primary5Cross-lists1
  1. 01

    [Submitted on 21 Oct 2015]

    Static Response of Neutron Matter

    Mateusz Buraczynski · Alexandros Gezerlis

    We generalize the problem of strongly interacting neutron matter by adding a periodic external modulation. This allows us to study from first principles a neutron system that is extended and inhomogeneous, with connections to the physics of both neutron-star crusts and neutron-rich nuclei. We carry out fully non-perturbative microscopic Quantum Monte Carlo calculations of the energy of neutron matter at different densities, as well as different strengths and periodicities of the external potential. In order to remove systematic errors, we examine finite-size effects and the impact of the wave function ansatz. We also make contact with energy-density functional theories of nuclei and disentangle isovector gradient contributions from bulk properties. Finally, we calculate the static density-density linear response function of neutron matter and compare it with the response of other physical systems.

    Comments:
    5+ pages, 3 figures; v2 corresponds to the published version
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); Quantum Gases (cond-mat.quant-gas); Strongly Correlated Electrons (cond-mat.str-el)
    arXiv:
    1510.06417 [pdf]
    PRL(2016)·46 citations
  2. 02

    [Submitted on 21 Oct 2015]

    Extended Skyrme interactions for nuclear matter, finite nuclei and neutron stars

    Zhen Zhang · Lie-Wen Chen

    Recent progress in theory, experiment and observation challenges the mean field models using the conventional Skyrme interaction, suggesting that the extension of the conventional Skyrme interaction is necessary. In this work, by fitting the experimental data of a number of finite nuclei together with a few additional constraints on nuclear matter using the simulated annealing method, we construct three Skyrme interaction parameter sets, namely, eMSL07, eMSL08 and eMSL09, based on an extended Skyrme interaction which includes additional momentum and density dependent two-body forces to effectively simulate the momentum dependence of the three-body force. The three new interactions can reasonably describe the ground-state properties and the isoscalar giant monopole resonance energies of various spherical nuclei used in the fit as well as the ground-state properties of many other spherical nuclei, nicely conform to the current knowledge on the equation of state of asymmetric nuclear matter, eliminate the notorious unphysical instabilities of symmetric nuclear matter and pure neutron matter up to a very high density of fm, and simultaneously support heavier neutron stars with mass larger than two times solar mass. One important difference of the three new interactions is about the prediction of the symmetry energy at supra-saturation densities, and these new interactions are thus potentially useful for the determination of the largely uncertain high-density symmetry energy in future. In addition, a comparison is made for the predictions of nuclear matter, finite nuclei and neutron stars with the three new interactions versus those with three typical interactions BSk22, BSk24 and BSk26 from Brussels group.

    Comments:
    18 pages, 6 figures, 5 tables. Results and discussions added. Accepted version to appear in PRC
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex)
    arXiv:
    1510.06459 [pdf]
    PRC(2016)·47 citations
  3. 03

    [Submitted on 22 Oct 2015]

    Heavy flavor electron and in event-by-event relativistic hydrodynamics

    Caio A G Prado🇧🇷 · Mauro R Cosentino🇧🇷 · Marcelo G Munhoz🇧🇷 · Jorge Noronha🇧🇷 · Alexandre A P Suaide🇧🇷

    In this work we investigate how event-by-event hydrodynamics fluctuations affect the nuclear suppression factor and elliptic flow of heavy flavor mesons and non-photonic electrons. We use a 2D+1 Lagrangian ideal hydrodynamic code on an event-by-event basis in order to compute local temperature and flow profiles. Using a strong coupling inspired energy loss parametrization on top of the evolving space-time energy density distributions we are able to propagate the heavy quarks inside the medium until the freeze-out temperature is reached and a Pythia modeling of hadronization takes place. The resulting D and heavy-flavor electron yield is compared with recent experimental data for and from the STAR and Phenix collaborations. In addition we present preditions for the higher order Fourier harmonic coefficients of heavy-flavor electrons at RHIC's GeV collisions.

    Comments:
    Proceedings for the XIII International Workshop on Hadron Physics, Angra dos Reis, Brazil, March 22-27, 2015; 6 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1510.06468 [pdf]
    J.Phys.Conf.Ser.(2016)·1 citation
  4. 04

    [Submitted on 22 Oct 2015]

    A combined model for the pseudorapidity distributions in p-p collisions at center-of-mass energies from 23.6 to 7000 GeV

    Zhi-Jin Jiang🇨🇳 · Yan Huang🇨🇳 · Jie Wang🇨🇳

    In p-p collisions, the produced charge particles consist of two leading particles and those frozen out from the hot and dense matter created in collisions. The two leading particles are respectively in the projectile and target fragmentation region, which, in this paper, are conventionally supposed to have Gaussian rapidity distributions. The hot and dense matter is assumed to expand according to the unified hydrodynamics, a hydro model which unifies the features of Landau and Hwa-Bjorken model, and freeze out into charged particles from a space-like hypersurface with a fixed proper time of Tau_FO. The rapidity distribution of this part of charged particles can be derived out analytically. The combined contribution from both leading particles and unified hydrodynamics is then compared against the experimental data performed in a wide now available center-of-mass energy region from 23.6 to 7000 GeV. The model predictions are in well consistent with experimental measurements.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.06517 [pdf]
    CPC(2016)·2 citations
  5. 05

    [Submitted on 22 Oct 2015]

    Asymmetric nuclear matter based on chiral two- and three-nucleon interactions

    Christian Drischler · Kai Hebeler · Achim Schwenk

    We calculate the properties of isospin-asymmetric nuclear matter based on chiral nucleon-nucleon (NN) and three-nucleon (3N) interactions. To this end, we develop an improved normal-ordering framework that allows to include general 3N interactions starting from a plane-wave partial-wave-decomposed form. We present results for the energy per particle for general isospin asymmetries based on a set of different Hamiltonians, study their saturation properties, the incompressibility, symmetry energy, and also provide an analytic parametrization for the energy per particle as a function of density and isospin asymmetry.

    Comments:
    minor changes, published version
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex)
    arXiv:
    1510.06728 [pdf]
    PRC(2016)·200 citations

Affiliations

first authorsco-authorsvia INSPIRE