Constrained caloric curves for hot nuclei
1 Institut de Physique Nucléaire, CNRS/IN2P3, Univ. Paris-Sud 11, Orsay, France
2 Sezione INFN, Sesto Fiorentino (Fi), Italy
3 National Institute for Physics and Nuclear Engineering, Bucharest-Măgurele, Romania
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 such properties, information on constrained caloric curves has been derived. At constant average volumes caloric curves exhibit a monotonous behavior whereas for constrained pressures backbending is observed. Such results support the existence of a first order phase transition for hot nuclei.
© Owned by the authors, published by EDP Sciences - SIF, 2012