Using BHF-derived in-medium cross sections in the IBUU transport model, the paper shows that nuclear stopping and differential flow are sensitive to scattering-amplitude, density-of-states, and total-momentum effects, while n/p and transverse-flow-difference probes remain robust.
The Disappearance of Flow
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abstract
We investigate the disappearance of collective flow in the reaction plane in heavy-ion collisions within a microscopic model (QMD). A systematic study of the impact parameter dependence is performed for the system Ca+Ca. The balance energy strongly increases with impact parameter. Momentum dependent interactions reduce the balance energies for intermediate impact parameters $b\approx4.5$ fm. Dynamical negative flow is not visible in the laboratory frame but does exist in the contact frame for the heavy system Au+Au. For semi-peripheral collisions of Ca+Ca with $b\approx6.5$ fm a new two-component flow is discussed. Azimuthal distributions exhibit strong collectiv flow signals, even at the balance energy.
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In-medium effects of nucleon-nucleon cross sections in heavy-ion collisions
Using BHF-derived in-medium cross sections in the IBUU transport model, the paper shows that nuclear stopping and differential flow are sensitive to scattering-amplitude, density-of-states, and total-momentum effects, while n/p and transverse-flow-difference probes remain robust.