The behaviour of constrained caloric curves as ultimate signature of a phase transition for hot nuclei

Abstract : Simulations based on experimental data obtained from multifragmenting quasifused nuclei produced in central 129Xe + natSn collisions have been used to deduce event by event freeze-out properties on the thermal excitation energy range 4-12 AMeV. From these properties and temperatures deduced from proton transverse momentum fluctuations constrained caloric curves have been built. At constant average volumes caloric curves exhibit a monotonous behaviour whereas for constrained pressures a backbending is observed. Such results support the existence of a first order phase transition for hot nuclei.
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B. Borderie, E. Galichet, M.F. Rivet, S. Piantelli, Ad.R. Raduta, et al.. The behaviour of constrained caloric curves as ultimate signature of a phase transition for hot nuclei. 11th International Conference on Nucleus-Nucleus Collisions (NN2012), May 2012, San Antonio, Texas, United States. pp.012081, ⟨10.1088/1742-6596/420/1/012081⟩. ⟨hal-00720759⟩

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