Kinetic theory of electrons and positrons in dense gaseous and liquid systems

White, R.D., Robson, R.E., Boyle, G., Dujko, S., and Petrovic, Z.Lj. (2010) Kinetic theory of electrons and positrons in dense gaseous and liquid systems. In: Proceedings of XX European Conference on the Atomic and Molecular Physics of Ionized Gases, pp. 1-2. From: ESCAMPIG XX 20th European Conference on the Atomic and Molecular Physics of Ionized Gases, 13 - 17 July 2010, Novi Sad, Serbia.

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Abstract

The recent resurgence of interest in positron transport in gases has been driven both by new fundamental positron-atom/molecule cross scattering sections [1, 2], and by the richness and novelty of the associated transport phenomena [3, 4]. In particular the phenomenon of negative differential conductivity (NDC) induced by positronium formation continues to be a focus of attention of kinetic theorists and modellers [5, 6], and there are other interesting effects yet to be explained. Although this work in gaseous systems is largely motivated by intrinsic physical interest, there are a number of important technological and medical applications (e.g. PET scans) which provide an additional imperative for such studies and in particular their extension to dense systems (liquid and soft-condensed), the subject of this presentation. Investigations of positron transport in dense systems so far have been very limited [7]. One can draw to some extent on the extensive transport theory literature for electrons in dense gases and liquids [8], and both electrons and positrons in gases, but there is no straightforward way of directly adapting this existing transport theory: A new theory is needed, in which the effects of both non-reactive coherent scattering by many atoms in the dense gaseous and liquid phases, and reactive collisions are accounted for, through a dynamic structure factor S(K,W) and the positronium formation at cross section respectively.

Item ID: 16812
Item Type: Conference Item (Refereed Research Paper - E1)
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Date Deposited: 16 May 2011 01:08
FoR Codes: 02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020201 Atomic and Molecular Physics @ 50%
02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020204 Plasma Physics; Fusion Plasmas; Electrical Discharges @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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