E-viri
PDF
Recenzirano
Odprti dostop
-
D'Agostino, M.; Gulminelli, F.; Chomaz, Ph; Bruno, M.; Cannata, F.; Bougault, R.; Gramegna, F.; Iori, I.; Le Neindre, N.; Margagliotti, G.V.; Moroni, A.; Vannini, G.
Physics letters. B, 02/2000, Letnik: 473, Številka: 3Journal Article
An experimental indication of negative heat capacity in excited nuclear systems is inferred from the event by event study of energy fluctuations in Au quasi-projectile sources formed in Au+Au collisions at 35 A.MeV. Equilibrated events are selected and the excited source configuration is reconstructed through a calorimetric analysis of its de-excitation products. Fragment partitions show signs of a critical behavior at about 4.5 A.MeV excitation energy. Around this value the heat capacity shows a negative branch providing a direct evidence of a first order liquid gas phase transition.
