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

被引：236

作者：

D'Agostino, M ^{[1
]}

Gulminelli, F

Chomaz, P

Bruno, M

Cannata, F

Bougault, R

Gramegna, F

Iori, I

Le Neindre, N

Margagliotti, GV

Moroni, A

Vannini, G

机构：

[1] Dipartimento Fis, Bologna, Italy

[2] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[3] LPC Caen, CNRS, IN2P3, ISMRA, F-14050 Caen, France

[4] GANIL, DSM, CEA, CNRS,IN2P3, F-14021 Caen, France

[5] Ist Nazl Fis Nucl, Lab Nazl Legnaro, Legnaro, Italy

[6] Univ Milan, Dipartimento Fis, Milan, Italy

[7] Ist Nazl Fis Nucl, I-20133 Milan, Italy

[8] Dipartimento Fis, Trieste, Italy

[9] Ist Nazl Fis Nucl, Trieste, Italy

来源：

PHYSICS LETTERS B | 2000年 / 473卷 / 3-4期

关键词：

multifragment emission; liquid-gas phase transition; microcanonical heat capacity; critical behavior;

D O I：

10.1016/S0370-2693(99)01486-0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：219 / 225

页数：7

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