Dynamical and sequential decay effects on isoscaling and density dependence of the symmetry energy

Abstract

The isoscaling properties of the primary and final products are studied via isospin dependent quantum molecular dynamics (IQMD) model and the followed sequential decay model GEMINI, respectively. It is found that the isoscaling parameters $\alpha$ of both primary and final products keep no significant change for light fragments, but increases with the mass for intermediate and heavy products. The dynamical effects on isoscaling are exhibited by that $\alpha$ value decreases a little with the evolution time of the system, and opposite trend for the heavy products. The secondary decay effects on isoscaling are reflected in the increasing of the $\alpha$ value for the final products which experiences secondary decay process. Furthermore the density dependence of the symmetry energy has also been explored, it is observed that in the low densities the symmetry energy coefficient has the form of $C_{sym}(\rho )\sim C_0(\rho /{\rho }_0{)}^{\gamma }$, where $\gamma =0.7\sim 1.3$ for both primary and final products, but $C_0$ have different values for primary and final products. It is also suggested that it might be more reasonable to describe the density dependence of the symmetry energy coefficient by the $C_{sym}(\rho /{\rho }_0)\approx C_1(\rho /{\rho }_0{)}^{{\gamma }_{soft}}+C_2(\rho /{\rho }_0{)}^{{\gamma }_{stiff}}$ with ${\gamma }_{soft}\le 1$, ${\gamma }_{stiff}\ge 1$ and $C_1,C_2$ constant parameters.

10 pages, 10 figures

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Cited by in corpus (5)

• Probing the density dependence of symmetry energy via multifragmentation at sub-saturation densities
• Probing the nuclear equation of state in heavy-ion collisions at Fermi energy in isospin-sensitive exclusive experiments
• Heavy-ion Collisions: Direct and indirect probes of the density and temperature dependence of Esym
• Effects of sequential decay on collective flows and nuclear stopping power in heavy-ion collisions at intermediate energies
• Effect of neutron skin thickness on projectile fragmentation