Positron scattering and transport in liquid helium

Cocks, D. G., McEachran, R. P., Boyle, G. J., Cheng, E., and White, R. D. (2020) Positron scattering and transport in liquid helium. Journal Of Physics B-atomic Molecular And Optical Physics, 53 (22). 225201.

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In previous papers we have proposed a method for theab initiocalculation of fully differential cross-sections for electron scattering in liquids and applied it to liquid argon, xenon and krypton. In this paper, we extend the procedure to the consideration of positron scattering in liquid helium, which is complicated by the annihilation process as well as the fact that the electron definition for the region 'owned' by a target atom used previously does not have a positron analogue. We explore several physically motivated definitions to obtain effective positron scattering in the dense fluid. We find that our calculations of a pure helium system cannot precisely match experimental measurements, however by including a small admixture (<0.1%) of an impurity, we can obtain reasonable agreement in the dense gas phase. In contrast, the comparison between our calculations and liquid phase measurements is less satisfactory. This provides motivation to explore further multiple scattering effects in the theory.

Item ID: 64898
Item Type: Article (Research - C1)
ISSN: 0953-4075
Keywords: positrons, dense fluids, transport, non-equilibrium
Copyright Information: © 2020 The Author(s). Published by IOP Publishing Ltd. This is an Open Access article distributed under the terms and conditions of a Creative Commons Attribution (CC-BY) licence.
Date Deposited: 28 Oct 2020 07:46
FoR Codes: 51 PHYSICAL SCIENCES > 5107 Particle and high energy physics > 510703 Particle physics @ 70%
51 PHYSICAL SCIENCES > 5106 Nuclear and plasma physics > 510601 Nuclear physics @ 30%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences @ 100%
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