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Systematics of Temperature Measurements with ALADIN

Systematics of Temperature Measurements with ALADIN. ALADIN S114 Spring 1993. ALADIN S114 Au+Au, Cu, Al, C @ 600 A MeV. T HeLi shows the target invariance that is exhibited by the partitions and suggested as indicating equilibration prior to breakup cf. Sch üttauf et al. NPA (1996).

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Systematics of Temperature Measurements with ALADIN

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  1. Systematics of Temperature Measurements with ALADIN ALADIN S114 Spring 1993

  2. ALADIN S114 Au+Au, Cu, Al, C @ 600 A MeV THeLi shows the target invariance that is exhibited by the partitions and suggested as indicating equilibration prior to breakup cf. Schüttauf et al. NPA (1996)

  3. THeLi target spectator THeLi projectile spectator T5Li target spectator T4He target spectator ALADIN S114 and S117 Au+Au @ 1000 A MeV THeLi and excited-state temperatures diverge as multifragment channels start to dominate at Zbound < 50 cf. Serfling et al., PRL(1998), Xi et al., PRC (1998)

  4. ALADIN S114 and S117 Au+Au Systematics of apparent temperatures: heavier fragments and excited states don't follow the rise of THeLi in more violent collisions (from T. Odeh, thesis) @ 600, 1000 central

  5. Experiments: INDRA at GSI November 1997 – April 1999 Au+Au, Xe+Sn, C+Au,112,124Sn Multifragmentation with ALADIN and INDRA Multifragmentation reactions at SIS energies probe highly excited nuclear systems at densities higher and lower than that of ground-state nuclei. New results: directed and elliptic flow in Au+Au; transition of the fragmentation dynamics from the Fermi to the participant-spectator regime; symmetry energy from isoscaling in spectator fragmentation (partly published). Of particular interest are phenomena related to the liquid-gas phase transition of nuclear matter. New results: isotope dependence of breakup temperatures; source shape determination (submitted). Asymmetric systems with extreme proton-to- neutron ratios are studied in experiments using secondary beams provided by the Fragment Separator FRS. New experiment S254: first use of secondary projectiles 107Sn and 124La for reaction studies (analysis in progress). Future projects: density dependence of the symmetry energy (ALADIN/FOPI). ALADIN S254 March – August 2003 projectiles 197Au, 107,124Sn, 124La

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