Positronium-Argon Scattering

Zafar, N.; Laricchia, G.; Charlton, M.; Garner, A J

doi:10.1103/physrevlett.76.1595

Cited by 88 publications

(52 citation statements)

References 14 publications

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“…Figure 1 illustrates the variation in mesh transmission with the duration of etching and temperature of the solution. As moderators, meshes are usually stacked together to enhance interception of the b þ particles emitted by the radioactive source (e.g., Zafar et al 1996). Weng et al (2004) expressed the probability of extracting a slow positron from such an arrangement as…”

Section: Experimental Methodsmentioning

confidence: 99%

Moderation and diffusion of positrons in tungsten meshes and foils

Williams

Murtagh

Fayer

et al. 2015

Journal of Applied Physics

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The efficiency of tungsten meshes and thin foils for moderation of fast positrons from 22Na has been investigated in transmission geometry and a fair agreement has been found with previous experimental results where directly comparable. For foils, the dependence on material thickness is found to be similar to the prediction of the Vehanen-Mäkinen diffusion model; however, the magnitude is 5–10 times lower. A broad consensus is observed between experiment and the results of a three-dimensional model developed in this work. For a given thickness, meshes are found to be generally better than foils by around a factor of 10 with a maximum efficiency (∼10−3) comparable to that achieved with thin single crystal foils, in accord with previous measurements and the results of the present model.

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Section: Experimental Methodsmentioning

confidence: 99%

Moderation and diffusion of positrons in tungsten meshes and foils

Williams

Murtagh

Fayer

et al. 2015

Journal of Applied Physics

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“…One is to use the gas molecules [2,3,11]. The other is to use silica nano-particles, which is preferred by the author, in particular, silica aerogel.…”

Section: Quenching Of Psmentioning

confidence: 98%

The quenching of ortho ‐positronium

Hyodo

Nakayama

Saito

et al. 2009

Phys. Status Solidi (c)

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Ortho‐positronium (o ‐Ps), which self‐annihilates into 3γ with a lifetime of 142ns, may be quenched through various interactions with atoms and molecules. The quenching process of o ‐Ps in gases, (i) pick‐off quenching, (ii) attachment (chemical) quenching, (iii) spin conversion quenching through electron exchange, (iv) spin conversion quenching through spin‐orbit interaction with a heavy atom, are reviewed. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…The differential cross section for the Ps formation reaction (12) is relatively larger at smaller angles to the incident positrons [67][68][69][70]. This feature has been used to produce beams of Ps atoms [71][72][73][74].…”

Section: Positronium Formation In Gasesmentioning

confidence: 99%

“…5) has also been developed [72][73][74]. Ps beams developed using charge transfer between slow positrons and gas molecules have enabled the measurement of total scattering cross sections in the energy range 10-400 eV [74].…”

Section: Energy Tunable Ps Beam Production By Neutralization Of Slow mentioning

confidence: 99%

Experiments on positronium negative ions

Nagashima

2014

Physics Reports

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Positronium-Argon Scattering

Cited by 88 publications

References 14 publications

Moderation and diffusion of positrons in tungsten meshes and foils

Moderation and diffusion of positrons in tungsten meshes and foils

The quenching of ortho ‐positronium

Experiments on positronium negative ions

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