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Nuclear Theory·nucl-th

Monday·June 6, 2016

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    Hadron rapidity spectra within a hybrid model

    A. S. Khvorostukhin🇷🇺 · V. D. Toneev🇷🇺

    A 2-stage hybrid model is proposed that joins the fast initial state of interaction, described by the hadron string dynamics (HSD) model, to subsequent evolution of the expanding system at the second stage, treated within ideal hydrodynamics. The developed hybrid model is assigned to describe heavy-ion collisions in the energy range of the NICA collider under construction in Dubna. Generally, the model is in reasonable agreement with the available data on proton rapidity spectra. However, reproducing proton rapidity spectra, our hybrid model cannot describe the rapidity distributions of pions. The model should be improved by taking into consideration viscosity effects at the hydrodynamical stage of system evolution.

    nucl-thhep-phPhys.Part.Nucl.Lett.(2017)·13 citations
  2. 02

    Preequilibrium particle emissions and in-medium effects on the pion production in heavy-ion collisions

    Zhao-Qing Feng🇨🇳

    Within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model, pion dynamics in heavy-ion collisions near threshold energies and the emission of preequilibrium particles (nucleons and light complex fragments) have been investigated. A density, momentum and isospin dependent pion-nucleon potential based on the -hole model is implemented in the transport approach, which slightly leads to the increase of the ratio, but reduces the total pion yields. It is found that a bump structure of the ratio in the kinetic energy spectra appears at the pion energy close to the (1232) resonance region. The yield ratios of neutrons to protons from the squeeze-out particles perpendicular to the reaction plane are sensitive to the stiffness of nuclear symmetry energy, in particular at the high-momentum (kinetic energy) tails.

    nucl-thEPJA(2017)·13 citations
  3. 03

    Superfluid hydrodynamics in the inner crust of neutron stars

    Noël Martin🇫🇷 · Michael Urban🇫🇷

    The inner crust of neutron stars is supposed to be inhomogeneous and composed of dense structures (clusters) that are immersed in a dilute gas of unbound neutrons. Here we consider spherical clusters forming a BCC crystal and cylindrical rods arranged in a hexagonal lattice. We study the relative motion of these dense structures and the neutron gas using superfluid hydrodynamics. Within this approach, which relies on the assumption that Cooper pairs are small compared to the crystalline structures, we find that the entrainment of neutrons by the clusters is very weak since neutrons of the gas can flow through the clusters. Consequently, we obtain a low effective mass of the clusters and a superfluid density that is even higher than the density of unbound neutrons. Consequences for the constraints from glitch observations are discussed.

    nucl-thastro-ph.HEPRC(2016)·57 citations

Affiliations

first authorsco-authorsvia INSPIRE