THERMODYNAMICAL ASPECTS IN HEAVY ION REACTIONS

Bruno, M.; Cannata, F.; D’Agostino, M.; De Sanctis, J.; Fabbri, S.; Fuschini, E.; Geraci, E.; Guiot, B.; Vannini, G.; Verondini, E.; Gulminelli, F.; Chomaz, P. H.; Casini, G.; Chiari, M.; Nannini, A.; Barlini, S.; Gramegna, F.; Kravchuk, V.; Lanchais, A.; Vannucci, L.; Moroni, A.; Ordine, A.; Abbondanno, U.; Margagliotti, G. V.

doi:10.1142/9789812701565_0021

he excited nuclear systems formed in heavy ion collisions can be studied from a thermodynamical point of view. Charged finite systems have different behaviors with respect to infinite ones. After experimental selection of such equilibrated systems the extraction of thermodynamic coordinates is performed. Different signals compatible with a liquid-gas phase transition have been obtained. In particular a bimodal distribution of the asymmetry between the first two heaviest fragments is presented. Abnormally large fluctuations, which in thermodynamic equilibrium are associated to a negative branch of the heat capacity give indications of a first order phase transition. Perspectives for new generation experiments are indicated.

THERMODYNAMICAL ASPECTS IN HEAVY ION REACTIONS / Bruno, M.; Cannata, F.; D’Agostino, M.; De Sanctis, J.; Fabbri, S.; Fuschini, E.; Geraci, E.; Guiot, B.; Vannini, G.; Verondini, E.; Gulminelli, F.; Chomaz, P. H.; Casini, Giovanni; Chiari, M.; Nannini, A.; Barlini, Sandro; Gramegna, F.; Kravchuk, V.; Lanchais, A.; Vannucci, L.; Moroni, A.; Ordine, A.; Abbondanno, U.; Margagliotti, G. V.. - ELETTRONICO. - (2005), pp. 209-218. (Intervento presentato al convegno 5th Italy/Japan Symposium on Recent Achievements and Perspectives in Nuclear Physics) [10.1142/9789812701565_0021].