Simulations based on experimental data obtained from multifragmenting quasi-fused 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.
The behaviour of constrained caloric curves as ultimate signature of a phase transition for hot nuclei / B., Borderie; S. Piantelli M. F., Rivet; A., Raduta; E., Bonnet; R., Bougault; A., Chbihi; E., Galichet; D., Guinet; P., Lautesse; N., Le Neindre; O., Lopez; M., Parlog; Rosato, Elio; R., Roy; Spadaccini, Giulio; E., Vient; Vigilante, Mariano. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6596. - 420:(2013), pp. 1-11. (Intervento presentato al convegno 11th International Conference on Nucleus-Nucleus Collisions (NN2012) tenutosi a San Antonio, Texas, USA nel 27 May to 1 June 2012) [10.1088/1742-6596/420/1/012081].
The behaviour of constrained caloric curves as ultimate signature of a phase transition for hot nuclei
ROSATO, ELIO;SPADACCINI, GIULIO;VIGILANTE, MARIANO
2013
Abstract
Simulations based on experimental data obtained from multifragmenting quasi-fused 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.