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11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas : États-Unis (2012)
The behaviour of constrained caloric curves as ultimate signature of a phase transition for hot nuclei
B. Borderie1, E. Galichet1, M.F. Rivet1, S. Piantelli2, Ad. R. Raduta3, E. Bonnet4, A. Chbihi4, J. D. Frankland4, R. Bougault5, O. Lopez5, E. Vient5, N. Le Neindre5, M. Pârlog5, D. Guinet6, Ph. Lautesse6, E. Rosato7, M. Vigilante7, G. Spadaccini7, R. Roy8

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.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  INFN, Sezione di Firenze - Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
3 :  NIPNE - Horia Hulubei National Institute of Physics and Nuclear Engineering
4 :  GANIL - Grand Accélérateur National d'Ions Lourds
5 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
6 :  IPNL - Institut de Physique Nucléaire de Lyon
7 :  INFN, Sezione di Napoli - Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
8 :  Laboratoire de Physique Nucléaire
Dynamique et thermodynamique nucléaire
Physique/Physique Nucléaire Expérimentale

Physique/Physique Nucléaire Théorique
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NN2012_borderie.pdf(249.6 KB)
NN2012_borderie.ps(658 KB)