Determination of the stiffness of the nuclear symmetry energy from isospin diffusion

作者：Chen, LW^*; Ko, CM; Li, BA

来源：Physical Review Letters, 2005, 94(3): 032701.

DOI：10.1103/PhysRevLett.94.032701

• Isospin diffusion
• Nuclear symmetry energy
• Nucleons
• Presupernova

With an isospin- and momentum-dependent transport model, we find that the degree of isospin diffusion in heavy-ion collisions at intermediate energies is affected by both the stiffness of the nuclear symmetry energy and the momentum dependence of the nucleon potential. Using a momentum dependence derived from the Gogny effective interaction, recent experimental data from NSCL-MSU on isospin diffusion are shown to be consistent with a nuclear symmetry energy given by E-sym(rho)approximate to31.6(rho/rho(0))(1.05) at subnormal densities. This leads to a significantly constrained value of about -550 MeV for the isospin-dependent part of the isobaric incompressibility of isospin asymmetric nuclear matter.

• 出版日期2005-1-28
• 单位上海交通大学