Can the nuclear symmetry potential at supra-saturation densities be negative?

Abstract

In the framework of an Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model, for the central ${}^{197}$Au+${}^{197}$Au reaction at an incident beam energy of 400 MeV/nucleon, effect of nuclear symmetry potential at supra-saturation densities on the pre-equilibrium clusters emission is studied. It is found that for the positive symmetry potential at supra-saturation densities the neutron to proton ratio of lighter clusters with mass number $A\le 3$ ($(n/p{)}_{A\le 3}$) is larger than that of the weighter clusters with mass number $A>3$ ($(n/p{)}_{A>3}$), whereas for the negative symmetry potential at supra-saturation densities the $(n/p{)}_{A\le 3}$ is \emph{smaller} than that of the $(n/p{)}_{A>3}$. This may be considered as a probe of the negative symmetry potential at supra-saturation densities.

5 pages, 3 figures, 1 table, to be published

References in corpus (7)

• Neutron-Rich Nuclei in Heaven and Earth
• Isotopic dependence of the giant monopole resonance in the even-A ^{112-124}Sn isotopes and the asymmetry term in nuclear incompressibility
• Neutron and Proton Transverse Emission Ratio Measurements and the Density Dependence of the Asymmetry Term of the Nuclear Equation of State
• Validating relativistic models of nuclear structure against theoretical, experimental, and observational constraints
• Triton-${}^3$He relative and differential flows as probes of the nuclear symmetry energy at supra-saturation densities
• Nuclear symmetry potential in the relativistic impulse approximation
• Differential isospin-fractionation in dilute asymmetric nuclear matter

Cited by in corpus (4)

• Normal or abnormal isospin-fractionation as a qualitative probe of nuclear symmetry energy at supradensities
• Effect of the momentum dependence of nuclear symmetry potential on pion-/pion+ ratio in heavy-ion collisions
• A direct probe of the in-medium pn scattering cross section
• Initialization effect in heavy-ion collisions at intermediate energies