Simulation of Positronium: Toward More Realistic Models of Void Spaces in Materials

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An exact treatment of the positron and electron in a two-chain, Path Integral Monte Carlo (PIMC) simulation is used to calculate both self-annihilation and pickoff rates at finite temperature. It has already been demonstrated that this technique can reproduce and extend results of simple theories of positrons and positronium (Ps) in spherical voids. Here, we include the effect of the linear dielectric response of a homogeneous material on the annihilation rate of positrons and Ps. In addition, we find lifetimes and structural information for Ps in cylindrical channels, both with and without adsorbed fluid atoms.

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PDF-file: 15 pages; size: 0.2 Mbytes

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Bug, A; Cronin, T; Sterne, P & Wolfson, Z August 18, 2005.

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Description

An exact treatment of the positron and electron in a two-chain, Path Integral Monte Carlo (PIMC) simulation is used to calculate both self-annihilation and pickoff rates at finite temperature. It has already been demonstrated that this technique can reproduce and extend results of simple theories of positrons and positronium (Ps) in spherical voids. Here, we include the effect of the linear dielectric response of a homogeneous material on the annihilation rate of positrons and Ps. In addition, we find lifetimes and structural information for Ps in cylindrical channels, both with and without adsorbed fluid atoms.

Physical Description

PDF-file: 15 pages; size: 0.2 Mbytes

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  • Presented at: 8th International Workshop on Positron and Positronium Chemistry (PPC8), Coimbra, Portugal, Sep 04 - Sep 09, 2005

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  • Report No.: UCRL-CONF-214749
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 878620
  • Archival Resource Key: ark:/67531/metadc874624

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  • August 18, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 9:17 p.m.

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Bug, A; Cronin, T; Sterne, P & Wolfson, Z. Simulation of Positronium: Toward More Realistic Models of Void Spaces in Materials, article, August 18, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc874624/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.