Isospin non-equilibrium in heavy-ion collisions at intermediate energies

Details Isospin non-equilibrium in heavy-ion collisions at intermediate energies Isospin non-equilibrium in heavy-ion collisions at intermediate energies

1995-05-12

arxiv.org/abs/nucl-th/9505015v1

Phys.Rev.C52:1746-1749,1995

Physics

Nuclear Physics

Nuclear Theory

9 pages, latex, + 3 figures available upon request

Scientific paper

10.1103/PhysRevC.52.R1746

We study the equilibration of isospin degree of freedom in intermediate energy heavy-ion collisions using an isospin-dependent BUU model. It is found that there exists a transition from the isospin equilibration at low energies to non-equilibration at high energies as the beam energy varies across the Fermi energy in central, asymmetric heavy-ion collisions. At beam energies around 55 MeV/nucleon, the composite system in thermal equilibrium but isospin non-equilibrium breaks up into two primary hot residues with N/Z ratios closely related to those of the target and projectile respectively. The decay of these forward-backward moving residues results in the strong isospin asymmetry in space and the dependence of the isotopic composition of fragments on the N/Z ratios of the target and projectile. These features are in good agreement with those found recently in experiments at NSCL/MSU and TAMU, implications of these findings are discussed.

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