Isospin dependence of collective flow in heavy-ion collisions at intermediate energies
Bao-An Li, Z. Z. Ren, C. M. Ko, S. J. Yennello
Abstract
Within the framework of an isospin-dependent Boltzmann-Uehling-Uhlenbeck (BUU) model using initial proton and neutron densities calculated from the nonlinear relativistic mean-field (RMF) theory, we compare the strength of transverse collective flow in reactions 48Ca+58Fe and 48Cr+58Ni, which have the same mass number but different neutron/proton ratios. The neutron-rich system (48Ca+58Fe) is found to show significantly stronger negative deflection and consequently has a higher balance energy, especially in peripheral collisions. NOTE ADDED IN PROOF: The new phenomenon predicted in this work has just been confirmed by an experiment done by G.D. Westfall et al. using the NSCL/MSU radioactive beam facility and a spartan soccer. A paper by R. Pak et al. is submitted to PRL to report the experimental result.
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