Negative heat capacity in the critical region of nuclear fragmentation: an experimental evidence of the liquid-gas phase transition

Abstract

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. 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 5 A.MeV excitation energy. In the same energy range the heat capacity shows a negative branch providing a direct evidence of a first order liquid gas phase transition.

4 Postscript figures, submitted to Phys. Rev. Lett. on 14-apr-1999

References in corpus (3)

• Bose-Einstein Condensation of Atomic Hydrogen
• Thermodynamical features of multifragmentation in peripheral Au + Au Collisions at 35 A.MeV
• Fragmentation phase transition in atomic clusters I --- Microcanonical thermodynamics

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