Simulation of positronium: Toward more realistic models of void spaces in materials |
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| Affiliation: | 1. Department of Physics and Astronomy, Swarthmore College, Swarthmore, PA 19081, USA;2. Lawrence Livermore National Laboratory, P.O. Box 808, L-045, Livermore, CA 94550, USA;1. Department of Physics, College of Science and Arts, Najran University, P.O. Box 1988, Najran, Saudi Arabia;2. Centre for Advanced Materials and Nano-Research (CAMNR), Najran University, Najran 11001, Saudi Arabia;1. Grupo de Pesquisa em Nanotecnologia e Nanomateriais, Centro Federal de Educação Tecnológica de Minas Gerais (CEFET-MG), Campus Timóteo, Timóteo, MG, Brazil;2. Laboratório de Espectroscopia de Aniquilação de Pósitrons (LEAP), Departamento de Química, Instituto de Ciências Exatas (ICEx), Universidade Federal de Minas Gerais (UFMG), Brazil;3. Departamento de Farmácia, Universidade Federal de Juiz de Fora (UFJF), Campus Governador Valadares-MG, Grupo de Pesquisa: Nanotecnologia dos Fluidos Complexos e dos Sistemas Supramoleculares, Av. Dr. Raimundo Monteiro de Rezende, 330, Centro, Governador Valadares, MG CEP: 35010-177, Brazil;1. Institute of Nuclear and Physical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology in Bratislava, Ilkovičova 3, 81219 Bratislava, Slovakia;2. Laboratory for Nuclear Materials, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland;3. Department of Low Temperature Physics, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 18000 Prague 8, Czech Republic;1. Department of Mechanical Engineering, Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima 890-0065, Japan;2. Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan;3. Spallation Neutron Source Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland |
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| Abstract: | An exact treatment of a positron and electron in a two-chain, Path Integral Monte Carlo (PIMC) simulation is used to calculate both self-annihilation and pick-off rates of Ps at finite temperature. We find the effect of the linear dielectric response of a homogeneous material on the annihilation rate of positrons and Ps in spherical voids. In addition, we find lifetimes and structural information for Ps in cylindrical channels, both with and without adsorbed fluid atoms. |
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