Transport coefficients for positron swarms in molecular gases
Conference Publication ResearchOnline@JCUAbstract
[Extract] Transport of positrons in various environments is interesting from many points of view [1]. They are standing behind the origin of astrophysical sources of annihilation radiation; they play a crucial role in production and detection of cold anti-hydrogen and also in the production of positronium (Ps). Recent investigations of positrons have triggered a whole new interesting research area – ionized gases with positrons that may be analyzed using similar techniques albeit for their short lifetime and even the antimatter plasmas. In addition, positrons have been already used for characterization of materials. However, perhaps the most important applications of positrons from the viewpoint of transport studies are the positron buffer-gas traps, such as the Surko trap, and also the use of positrons in the medical diagnostics of positron emission tomography (PET) and possible cancer treatments. Thanks to the recent advances in experimental measurements of high-resolution, low-energy inelastic positron scattering cross sections [2], the determination of positron transport coefficients over a wide range of energies has become possible. These measurements confirm that Ps formation, a non-conservative process unique to positrons, has a much larger cross section than annihilation and the analogous loss process for electrons- the dissociative attachment. This fact, coupled with a very strong energy dependence for Ps formation, is expected to lead to kinetic effects [3].
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ESCAMPIG XX 20th European Conference on the Atomic and Molecular Physics of Ionized Gases
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2
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Novi Sad, Serbia
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Institute of Physics
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Belgrade, Serbia
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