Theoretical study of the thermalization of the positronium interacting with atoms

[摘要] We have investigated the thermalization properties of a gas made by positronium atoms in interaction with a dense gas. Our theoretical model is based on the kinetic Boltzmann formalism that focuses on the microscopical description of the binary positronium-atom collision. We analyzethe evolution of the velocity distribution of the positronium atoms during the thermalization process. Our simulations reveal that due to the collision with the heavy mass atoms, the positronium distribution differs significantly from the expected Maxwell-Boltzmann distribution. In particular, a large depletion of ultra-cold atoms is observed.

[发布机构] Institut de Physique et Chimie des Matériaux de Strasbourg, CNRS, University of Strasbourg, France^1

[效力级别] 化学

[关键词] Dense gas;Maxwell-Boltzmann distribution;Positronium atom;Theoretical modeling;Theoretical study;Thermalization;Thermalization process;Ultracold atoms