Properties and Mechanism of Isospin Fractionation in Intermediate Energy Heavy Ion Collisions
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Abstract
The degree of isospin fractionation is measured by (N/Z)gas / (N/Z)liq，where (N/Z)gas and (N/Z)liq are the saturated neutronproton ratio of nucleon emissions ( gas phase) and that of fragment emitted (liquid phase) in heavy ion collision at intermediate energy. The calculated results by using the isospindependent quantum molecular dynamics model show that the degree of isospin fractionation is sensitive to the neutronproton ratio of colliding system. In particular， the degree of isospin fractionation sensitively depends on the symmetry potential and weakly on the inmedium nucleonnucleon cross section for the neutronrich system. In this case， we propose that the degree of isospin fractionation can be directly compared with the experimental data so that the information about symmetry potential can be obtained.
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