期刊
PHYSICS LETTERS B
卷 473, 期 3-4, 页码 219-225出版社
ELSEVIER
DOI: 10.1016/S0370-2693(99)01486-0
关键词
multifragment emission; liquid-gas phase transition; microcanonical heat capacity; critical behavior
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. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
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