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arXiv · 1207.6085

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

B. Borderie·S. Piantelli·M. F. Rivet·Ad. R. Raduta·E. Bonnet·R. Bougault·A. Chbihi·E. Galichet·D. Guinet·Ph. Lautesse·N. Le Neindre·O. Lopez·M. Parlog·E. Rosato·R. Roy·G. Spadaccini·E. Vient·M. Vigilante
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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, S. Piantelli, M. F. Rivet, Ad. R. Raduta, E. Bonnet, R. Bougault, A. Chbihi, E. Galichet, D. Guinet, Ph. Lautesse, N. Le Neindre, O. Lopez, M. Parlog, E. Rosato, R. Roy, G. Spadaccini, E. Vient, M. Vigilante. 2012-07-25. The behaviour of constrained caloric curves as ultimate signature of a phase transition for hot nuclei. https://doi.org/10.1088/1742-6596/420/1/012081

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