Density dependence of the "symmetry energy" in the lattice gas model

Abstract

Isoscaling behavior of the statistical emission fragments from the equilibrated sources with $Z$ = 30 and $N$ = 30, 33, 36 and 39, resepectively, is investigated in the framework of isospin dependent lattice gas model. The dependences of isoscaling parameters $\alpha$ on source isospin asymmetry, temperature and freeze-out density are studied and the "symmetry energy" is deduced from isoscaling parameters. Results show that "symmetry energy" $C_{sym}$ is insensitive to the change of temperature but follows the power-law dependence on the freeze-out density $\rho$. The later gives $C_{sym}$ = 30$(\rho /{\rho }_0{)}^{0.62}$ if the suitable asymmetric nucleon-nucleon potential is taken. The effect of strength of asymmetry of nucleon-nucleon interaction potential on the density dependence of the "symmetry energy" is dicussed.

5 pages, 4 pages

References in corpus (3)

• Evolution of the symmetry energy of hot neutron-rich matter formed in heavy-ion reactions
• Isospin effect in the statistical sequential decay
• Dynamical aspects of isotopic scaling

Cited by in corpus (2)

• Isoscaling as a measure of Symmetry Energy in the Lattice Gas Model
• Exploring the Lattice Gas Model for isoscaling