Yongjia Wang

Results of the ASY-EOS experiment at GSI : the symmetry energy at suprasaturation density

Directed and elliptic flows of neutrons and light charged particles were measured for the reaction 197Au+197Au at 400 MeV/nucleon incident energy within the ASY-EOS experimental campaign at the GSI laboratory. The detection system consisted of the Large Area Neutron Detector LAND, combined with parts of the CHIMERA multidetector, of the ALADIN Time-of-flight Wall, and of the Washington-University Microball detector. The latter three arrays were used for the event characterization and reaction-plane reconstruction. In addition, an array of triple telescopes, KRATTA, was used for complementary measurements of the isotopic composition and flows of light charged particles. From the comparison of the elliptic flow ratio of neutrons with respect to charged particles with UrQMD predictions, a value \gamma = 0.72 \pm 0.19 is obtained for the power-law coefficient describing the density dependence of the potential part in the parametrization of the symmetry energy. It represents a new and more stringent constraint for the regime of supra-saturation density and confirms, with a considerably smaller uncertainty, the moderately soft to linear density dependence deduced from the earlier FOPI-LAND data. The densities probed are shown to reach beyond twice saturation.

Collective flow of light particles in Au + Au collisions at intermediate energies

The Skyrme potential energy density functional is introduced into the ultrarelativistic quantum molecular dynamics model and the updated version is applied to studying the directed and elliptic flows of light particles (protons, neutrons, deuterons, tritons,

3H/3He ratio as a probe of the nuclear symmetry energy at sub-saturation densities

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Production of unknown neutron-rich isotopes in U 238 + U 238 collisions at near-barrier energy

He, and

Model dependence of isospin sensitive observables at high densities

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Normal or abnormal isospin-fractionation as a qualitative probe of nuclear symmetry energy at supradensities

He) in

Comparison of heavy-ion transport simulations: Collision integral in a box

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Influence of the symmetry energy on the cone-azimuthal emission

Au +

Influence of coalescence parameters on the production of protons and Helium-3 fragments

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Influence of the time-step on the production of free nucleons and pions from heavy-ion collisions around 1 GeV/nucleon

Au collisions at beam energies 150, 250, and 400 MeV