| Abstract: | Using the large acceptance apparatus FOPI, we study central and semi-central
collisions in the reactions (energies in A GeV are given in parentheses):
40Ca+40Ca (0.4, 0.6, 0.8, 1.0, 1.5, 1.93), 58Ni+58Ni (0.15, 0.25, 0.4),
96Ru+96Ru (0.4, 1.0, 1.5), 96Zr+96Zr (0.4, 1.0, 1.5), 129Xe+CsI (0.15, 0.25,
0.4), 197Au+197Au (0.09, 0.12, 0.15, 0.25, 0.4, 0.6, 0.8, 1.0, 1.2, 1.5). The
observables include directed and elliptic flow. The data are compared to
earlier data where possible and to transport model simulations. A stiff nuclear
equation of state is found to be incompatible with the data. Evidence for
extra-repulsion of neutrons in compressed asymmetric matter is found. |
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