Study of the positronium thermalization in porous materials*
Institut de Physique et Chimie des Matériaux de
Strasbourg and Labex NIE, Université de Strasbourg, CNRS UMR 7504,
23 rue du Loess,
Received in final form: 22 January 2014
Published online: 23 April 2014
We simulate the thermalization process of a high energetic positronium gas trapped in a silica pore. The gas dynamics is reproduced by using a kinetic approach. Our approach includes the two-body scattering interaction and the exchange of energy between the atoms and the internal surface of the pore cavity. We discuss the formation of a quasi-equilibrium state induced by the fast internal thermalization of the gas and the evolution of the gas temperature. We estimate the time necessary to achieve the total thermalization of the gas. The reliability of our model is verified by comparing the numerical results with some experimental data.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2014