Azimuthal distribution in heavy-ion collisions

We consider recent experimental data on azimuthal distributions of particles seen in heavy-ion collisions at 35 MeV/nucleon and at 50 MeV/nucleon. For 12C on 12C at 50 MeV/nucleon laboratory energy, the distribution shows features characteristic of flow; for 12C on 197Au experimental data show features characteristic of rotation. For 40Ar on 51V at 35 MeV/nucleon, effects of both flow and rotation are seen. In magnitudes the effects are small. We find that Boltzmann-Uehling-Uhlenbeck calculations are able to reproduce these results