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Critical-like behaviours in central and peripheral collisions: a comparative analysis

✍ Scribed by M. D'Agostino; M. Bruno; F. Gulminelli; R. Bougault; F. Cannata; Ph. Chomaz; F. Gramegna; I. Iori; N. Le Neindre; G.V. Margagliotti; A. Moroni; G. Vannini; J.P. Wieleczko

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
427 KB
Volume
724
Category
Article
ISSN
0375-9474

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✦ Synopsis

Quasi-projectile events from peripheral 35 A MeV Au + Au collisions are compared with 25 A MeV Au + C, 25 and 35 A MeV Au + Cu and 35 A MeV Au + Au central events. By fitting the measured charge yields with the Fisher droplet model technique, all the different data sets coherently point to a value E * c ≈ 4.5 A MeV as the excitation energy where size distribution are best fitted by a power law. The physical parameters extracted from the fit strongly depend on the detailed shape assumed for the scaling function with the exception of τ and σ which are consistent with the critical exponents of the liquid-gas phase transition. Possible implications concerning the observation of a phase transition in multifragmentation experiments are discussed.

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