1207.6085 (B. Borderie et al.)

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

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

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.

View original: http://arxiv.org/abs/1207.6085