Figure 6 presents, as an example, the azimuthal dependence of E

Mean c.m. energy (Ecmkin)of Z=2 products as a function of the azimuthal angle, shown for: Au+Au at ER4 centrality and different energies (left); Au+Au at 250 AMeV and different centralities (middle), and Au+Au and Xe+CsI at 250 AMeV and ER4 centrality (right). The error bars include systematic effects.

As shown by the solid lines, the data follow very well the behaviour

Comparisons between data and model calculations show that the flow energy values along different azimuthal directions could be viewed as snapshots of the fireball expansion with different exposure times.

For the same number of participating nucleons more transversally elongated participant shapes from the heavier system produce less collective transverse energy.

Comparisons between data and model calculations show that the flow energy values along different azimuthal directions could be viewed as snapshots of the fireball expansion with different exposure times.

For the same number of participating nucleons more transversally elongated participant shapes from the heavier system produce less collective transverse energy.

For the 400 AMeV Au+Au collisions Figure shows the results of the Boltzmann- Uehling-Uhlenbeck (BUU) transport code [1], using momentum dependent mean fields (m*/m=0.79), in-medium elastic cross sections ( with ) and soft (K=210 MeV, gray zone) or stiff (K=380 MeV, dashed zone) EoS. Good agreement with BUU calculations is obtained for a soft nuclear equation of state.

and as a function of , for Z=1 (A=1,2,3) fragments, Au+Au at 400 AMeV. The experimental results are represented by triangles, the BUU results are represented by gray zones for soft EoS and dashed zones for stiff EoS, respectively.

and as a function of , for Z=1 (A=1,2,3) fragments, Au+Au at 400 AMeV. The experimental results are represented by triangles, the BUU results are represented by gray zones for soft EoS and dashed zones for stiff EoS, respectively.

1. P. Danielewicz and Q. Pan, Phys. Rev. C 46 (1992) 2002, P. Danielewicz, Nucl. Phys A 673 (2000) 375