Differential isospin-fractionation in dilute asymmetric nuclear matter

Details Differential isospin-fractionation in dilute asymmetric nuclear matter Differential isospin-fractionation in dilute asymmetric nuclear matter

2007-10-15

arxiv.org/abs/0710.2877v1

Phys.Rev.C76:051601,2007

Physics

Nuclear Physics

Nuclear Theory

Rapid Communication, Phys. Rev. C (2007) in press

Scientific paper

10.1103/PhysRevC.76.051601

The differential isospin-fractionation (IsoF) during the liquid-gas phase transition in dilute asymmetric nuclear matter is studied as a function of nucleon momentum. Within a self-consistent thermal model it is shown that the neutron/proton ratio of the gas phase becomes {\it smaller} than that of the liquid phase for energetic nucleons, although the gas phase is overall more neutron-rich. Clear indications of the differential IsoF consistent with the thermal model predictions are demonstrated within a transport model for heavy-ion reactions. Future comparisons with experimental data will allow us to extract critical information about the momentum dependence of the isovector strong interaction.

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