Eur. Phys. J. A (2007) 31: 854-857
https://doi.org/10.1140/epja/i2006-10280-8

QNP 2006

Freeze-out of the expanding system

¹ Departament d'Estructura i Constituents de la Matéria, Universitat de Barcelona, Diagonal 647, 08028, Barcelona, Spain
² Section for Theoretical and Computational Physics, University of Bergen, Allegaten 55, 5007, Bergen, Norway
³ MTA-KFKI, Research Institute of Particle and Nuclear Physics, P.O. Box 49, H-1525, Budapest 114, Hungary

Received: 18 December 2006
Accepted: 25 December 2006
Published online: 20 March 2007

Abstract

The freeze-out (FO) of the expanding systems, created in relativistic heavy-ion collisions, is discussed. We start with kinetic FO model, which realizes complete physical FO in a layer of given thickness, and then combine our gradual FO equations with Bjorken-type system expansion into a unified model. We shall see that the basic FO features, pointed out in the earlier works, are not smeared out by the expansion.