In UrQMD simulations of Au+Au at SIS18/SIS100 energies, the final midrapidity elliptic flow is generated late by the mean-field potential during the breakup of a matter bridge, not by early squeeze-out or spectator shadowing.
Continuous Decoupling of Dynamically Expanding Systems
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abstract
The question of decoupling and freeze-out is reinvestigated and analysed in terms of transparent semi-classical decoupling formulae, which provide a smooth decoupling in time both, for single and two particle inclusive spectra. They generalise frequently employed instantaneous freeze-out procedures and provide simple relations between the damping width and the duration of the decoupling process. The implications on physical phenomena arising from the expansion and decay dynamics of the highly compressed hadronic matter generated in high energy nuclear collisions are discussed.
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Untangling the interplay of the Equation-of-State and the Collision Term towards the generation of Directed and Elliptic Flow at intermediate energies
In UrQMD simulations of Au+Au at SIS18/SIS100 energies, the final midrapidity elliptic flow is generated late by the mean-field potential during the breakup of a matter bridge, not by early squeeze-out or spectator shadowing.