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

الأصل · EN

In the framework of an Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model, for the central ¹⁹⁷Au+¹⁹⁷Au 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≤3 ((n/p)ₐ≤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≤₃ is 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.