Abstract
We review recent developments of an event generator JAM microscopic transport model to simulate high energy nuclear collisions, especially at high baryon density regions. Recent developments focus on the collective effects: implementation of nuclear potentials, equation of state (EoS) modified collision term, and dynamical integration of fluid dynamics. With these extensions, we can discuss the EoS dependence of the transverse collective flows.
Highlights
The transport theoretical description of nuclear collisions is necessary to understand the collision dynamics, and extract information about the properties of hot and dense matter produced in heavy-ion collisions
In the original version of JAM, a nuclear collision is described by the so-called cascade model in which nuclear collisions are modeled by the superposition of independent binary collisions among hadrons including produced ones with a probability given by the free hadronhadron scattering cross section
Strings or hadron resonances may be produced at each inelastic hadron-hadron collision, and secondary products from the decay of strings or hadron resonances can scatter again, which are the main source of collective flows in the cascade model
Summary
The transport theoretical description of nuclear collisions is necessary to understand the collision dynamics, and extract information about the properties of hot and dense matter produced in heavy-ion collisions. Repulsive and attractive orbits are randomly selected; as a result, the two-body collision term does not contribute to the pressure in average, and the cascade simulation yields the ideal hadron resonance gas EoS in equilibrium. It is seen that JAM with nuclear mean-field simulations predict a stronger stopping than the experimental data.
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