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

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

2004-07-09

arxiv.org/abs/nucl-th/0407032v2

Phys.Rev.Lett.94:032701,2005

Physics

Nuclear Physics

Nuclear Theory

4 pages, 4 figures, 1 table, revised version, to appear in PRL

Scientific paper

10.1103/PhysRevLett.94.032701

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_{\text{sym}}(\rho)\approx 31.6(\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.

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