Eur. Phys. J. A 11, 87-93 (2001)

Microscopic systems with and without Coulomb interaction, fragmentation and phase transitions in finite nuclei

J.M. Carmona¹, J. Richert² and P. Wagner<sup>3

1</sup>  Dipartimento di Fisica dell'Università and INFN, I-56127 Pisa, Italy
²  Laboratoire de Physique Théorique, UMR 7085, Université Louis Pasteur, 3, rue de l'Université, 67084 Strasbourg Cedex, France
³  Institut de Recherches Subatomiques, UMR 7500, BP28, 67037 Strasbourg Cedex 2, France

carmona@df.unipi.it
richert@lpt1.u-strasbg.fr
pierre.wagner@ires.in2p3.fr

(Received: 7 November 2000 / Revised version: 14 April 2001 Communicated by P. Schuck)

Abstract
We test the influence of the Coulomb interaction on the thermodynamic and cluster generation properties of a system of classical particles described by different lattice models. Numerical simulations show that the Coulomb interaction produces essentially a shift in temperature of quantities like the specific heat but not qualitative changes. We also consider a cellular model. The thermodynamic properties of the system are qualitatively unaltered.

PACS
05.70.Ce - Thermodynamics functions and equations of state.
64.60.Cn - Order-disorder transformations; statistical mechanics of model systems.

© Società Italiana di Fisica, Springer-Verlag 2001