5 research outputs found
Momentum dependence of the symmetry potential and nuclear reactions induced by neutron-rich nuclei at RIA
Effects of the momentum-dependence of the symmetry potential in nuclear
reactions induced by neutron-rich nuclei at RIA energies are studied using an
isospin- and momentum-dependent transport model. It is found that symmetry
potentials with and without the momentum-dependence but corresponding to the
same density-dependent symmetry energy lead to significantly
different predictions on several -sensitive experimental
observables. The momentum-dependence of the symmetry potential is thus
critically important for investigating accurately the equation of state () and novel properties of dense neutron-rich matter at RIA.Comment: Rapid Communication, Phys. Rev. C in pres
A Transport Model for Nuclear Reactions Induced by Radioactive Beams
Major ingredients of an isospin and momentum dependent transport model for
nuclear reactions induced by radioactive beams are outlined. Within the IBUU04
version of this model we study several experimental probes of the equation of
state of neutron-rich matter, especially the density dependence of the nuclear
symmetry energy. Comparing with the recent experimental data from NSCL/MSU on
isospin diffusion, we found a nuclear symmetry energy of at subnormal densities. Predictions on
several observables sensitive to the density dependence of the symmetry energy
at supranormal densities accessible at GSI and the planned Rare Isotope
Accelerator (RIA) are also made.Comment: 10 pages. Talk given at the 2nd Argonne/MSU/JINA/INT RIA Workshop at
MSU, March 9-12, 2005 to be published in the Proceedings by the American
Institute of Physic
Effects of momentum-dependent symmetry potential on heavy-ion collisions induced by neutron-rich nuclei
Using an isospin- and momentum-dependent transport model we study effects of
the momentum-dependent symmetry potential on heavy-ion collisions induced by
neutron-rich nuclei. It is found that symmetry potentials with and without the
momentum-dependence but corresponding to the same density-dependent symmetry
energy lead to significantly different predictions on several
-sensitive experimental observables especially for energetic
nucleons. The momentum- and density-dependence of the symmetry potential have
to be determined simultaneously in order to extract the
accurately. The isospin asymmetry of midrapidity nucleons at high transverse
momenta is particularly sensitive to the momentum-dependence of the symmetry
potential. It is thus very useful for investigating accurately the equation of
state of dense neutron-rich matter.Comment: The version to appear in Nucl. Phys. A. A paragraph and a figure on
neutron and proton effective masses in neutron-rich matter are adde