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
Study ofthe positronium thermalization in porous materials / Morandi, Omar; Hervieux, Paul-Antoine; Manfredi, Giovanni. - In: THE EUROPEAN PHYSICAL JOURNAL. D, ATOMIC, MOLECULAR AND OPTICAL PHYSICS. - ISSN 1434-6060. - ELETTRONICO. - 68:(2014), pp. 84-92. [10.1140/epjd/e2014-40719-1]
Study ofthe positronium thermalization in porous materials
MORANDI, OMAR;
2014
Abstract
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
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