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arXiv · 1102.2728

Neutron-proton elliptic flow difference as a probe for the high density dependence of the symmetry energy

M. D. Cozma
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Abstract

We employ an isospin dependent version of the QMD transport model to study the influence of the isospin dependent part of the nuclear matter equation of state and in-medium nucleon-nucleon cross-sections on the dynamics of heavy-ion collisions at intermediate energies. We find that the extraction of useful information on the isospin-dependent part of the equation of state of nuclear matter from proton or neutron elliptic flows is obstructed by their sensitivity to model parameters and in-medium values of nucleon-nucleon cross-sections. Opposite to that, neutron-proton elliptic flow difference shows little dependence on those variables while its dependence on the isospin asymmetric EoS is enhanced. Comparison with experimental neutron-hydrogen FOPI-LAND data excludes the extreme super-soft scenarios for the high density dependence of asy-EoS. Existing neutron-proton elliptic flow difference experimental data are poised with uncertainties and cannot constrain the asy-EoS any further.

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M. D. Cozma. 2011-06-22. Neutron-proton elliptic flow difference as a probe for the high density dependence of the symmetry energy. https://doi.org/10.1016/j.physletb.2011.05.002

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