RESUMO
We present a complete systematics (excitation functions and system-size dependences) of global stopping and side flow for heavy ion reactions in the energy range between 0.09A and 1.93A GeV. For the heaviest system, Au+Au, we observe a plateau of maximal stopping extending from about 0.2A to 0.8A GeV with a fast drop on both sides. The degree of stopping, which is shown to remain significantly below the expectations of a full stopping scenario, is found to be highly correlated to the amount of side flow.
RESUMO
Detailed studies of the azimuthal dependence of the mean fragment and flow energies in the Au+Au and Xe+CsI systems are reported as a function of incident energy and centrality. 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. Good agreement with Boltzmann-Uehling-Uhlenbeck calculations is obtained for a soft nuclear equation of state.
RESUMO
The radiation source ELBE atDresden-Rossendorf is centered around asuperconducting ELectron accelerator ofhigh Brilliance and low Emittance (ELBE) which produces electronbeams up to 40 MeV. This new facility delivers secondary radiation of differentkinds. Special emphasis will be given tothe production of intense THz radiationfrom its Free-Electron Lasers (FEL). This radiation will be usedfor various research activities including the life sciences. Two additionalfemtosecond Ti:sapphire laser systems allowto exploit different methods of THzgeneration for such investigations.