Wednesday, May 8, 2013

1305.1517 (Bernard Borderie et al.)

Constrained caloric curves and phase transition for hot nuclei    [PDF]

Bernard Borderie, S. Piantelli, M. F. Rivet, Ad. R. Raduta, G. Ademard, E. Bonnet, R. Bougault, A. Chbihi, J. D. Frankland, E. Galichet, D. Gruyer, D. Guinet, P. Lautesse, N. Le Neindre, O. Lopez, P. Marini, M. Parlog, P. Pawlowski, E. Rosato, R. Roy, M. Vigilante
Simulations based on experimental data obtained from multifragmenting quasi-fused nuclei produced in central $^{129}$Xe + $^{nat}$Sn collisions have been used to deduce event by event freeze-out properties in the thermal excitation energy range 4-12 AMeV [Nucl. Phys. A809 (2008) 111]. From these properties and the temperatures deduced from proton transverse momentum fluctuations, constrained caloric curves have been built. At constant average volumes caloric curves exhibit a monotonic 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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