Model dependence of isospin sensitive observables at high densities

Abstract

Within two different frameworks of isospin-dependent transport model, i.e., Boltzmann-Uehling-Uhlenbeck (IBUU04) and Ultrarelativistic Quantum Molecular Dynamics (UrQMD) transport models, sensitive probes of nuclear symmetry energy are simulated and compared. It is shown that neutron to proton ratio of free nucleons, pi-/pi+ ratio as well as isospin-sensitive transverse and elliptic flows given by the two transport models with their "best settings", all have obvious differences. Discrepancy of numerical value of isospin-sensitive n/p ratio of free nucleon from the two models mainly originates from different symmetry potentials used and discrepancies of numerical value of charged pi-/pi+ ratio and isospin-sensitive flows mainly originate from different isospin-dependent nucleon-nucleon cross sections. These demonstrations call for more detailed studies on the model inputs (i.e., the density- and momentum-dependent symmetry potential and the isospin-dependent nucleon-nucleon cross section in medium) of isospin-dependent transport model used. The studies of model dependence of isospin sensitive observables can help nuclear physicists to pin down the density dependence of nuclear symmetry energy through comparison between experiments and theoretical simulations scientifically.

9 pages, 7 figures, more discussions added, accepted by Phys. Lett. B

References in corpus (13)

• Isotopic dependence of the giant monopole resonance in the even-A ^{112-124}Sn isotopes and the asymmetry term in nuclear incompressibility
• Symmetry energy from elliptic flow in 197Au + 197Au
• Systematics of pion emission in heavy ion collisions in the 1A GeV regime
• The influence of cluster emission and the symmetry energy on neutron-proton spectral double ratios
• Isospin Diffusion in Heavy-Ion Collisions and the Neutron Skin Thickness of Lead
• Isospin Diffusion Observables in heavy ion reactions
• Double neutron-proton differential transverse flow as a probe for the high-density behavior of the nuclear symmetry energy
• Triton-${}^3$He relative and differential flows as probes of the nuclear symmetry energy at supra-saturation densities
• Probing the symmetry energy and the degree of isospin equilibrium
• Understanding the symmetry energy using data from the ALADIN-2000 Collaboration taken at the GSI Large Neutron Detector
• Effect of the momentum dependence of nuclear symmetry potential on pion-/pion+ ratio in heavy-ion collisions
• Isospin Dynamics in Heavy Ion Collisions: EoS-sensitive Observables
• The influence of reconstruction criteria on the sensitive probes of the symmetry potential

Cited by in corpus (12)

• Determination of the nuclear incompressibility from the rapidity-dependent elliptic flow in heavy-ion collisions at beam energies 0.4\emph{A} - 1.0\emph{A} GeV
• Constraining the high-density nuclear symmetry energy with the transverse-momentum dependent elliptic flow
• Normal or abnormal isospin-fractionation as a qualitative probe of nuclear symmetry energy at supradensities
• The influence of the symmetry energy on the cone-azimuthal emission
• Decomposition of sensitivity of the symmetry energy observables
• Effects of the high-momentum tail of nucleon momentum distribution on the isospin-sensitive observables
• The effect of internal magnetic field on collective flow in heavy ion collisions at intermediate energies
• Effects of retarded electrical fields on observables sensitive to the high-density behavior of nuclear symmetry energy in heavy-ion collisions at intermediate energies
• Determination of the density region of the symmetry energy probed by the ${\pi }^{-}/{\pi }^{+}$ ratio
• Probing the density dependence of the symmetry energy by nucleon flow
• Probing the boundary of phase transition of nuclear matter using proton flows in heavy-ion collisions at 2-8 GeV/nucleon
• In-medium effects of nucleon-nucleon cross sections in heavy-ion collisions