Positron scattering from argon: total cross sections and the scattering length

Antonio Zecca; Luca Chiari; E Trainotti; D Fursa; I Bray; Anindya Sarkar; S Chattopadhyay; K Ratnavelu; Michael Brunger

doi:10.1088/0953-4075/45/1/015203

Positron scattering from argon: total cross sections and the scattering length

Antonio Zecca, Luca Chiari, E Trainotti, D Fursa, I Bray, Anindya Sarkar, S Chattopadhyay, K Ratnavelu, Michael Brunger

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48 Citations (Scopus)

Abstract

We report results from new positron-argon total cross-section (TCS) measurements. Agreement with the corresponding recent data of Jones et al (2011 Phys. Rev. A 83 032701) is found to be very good, except at the lowest energies of common measurement. Excellent qualitative agreement is also found between our measurements and an improved convergent close-coupling (CCC) calculation which was undertaken as a part of this study. This level of accord between our experimental and theoretical TCSs has enabled us to determine an experimental scattering length (a) of a = -4.9 0.7 au for the positron-argon system. That value is in excellent agreement with the relativistic polarized orbital optical potential approach result of Jones et al (a = -4.7 au) and our CCC result of a = -4.3 au.

Original language	English
Article number	015203
Pages (from-to)	015203-1-015203-6
Number of pages	6
Journal	Journal of Physics B-Atomic Molecular and Optical Physics
Volume	45
Issue number	1
DOIs	https://doi.org/10.1088/0953-4075/45/1/015203
Publication status	Published - 14 Jan 2012

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abstract = "We report results from new positron-argon total cross-section (TCS) measurements. Agreement with the corresponding recent data of Jones et al (2011 Phys. Rev. A 83 032701) is found to be very good, except at the lowest energies of common measurement. Excellent qualitative agreement is also found between our measurements and an improved convergent close-coupling (CCC) calculation which was undertaken as a part of this study. This level of accord between our experimental and theoretical TCSs has enabled us to determine an experimental scattering length (a) of a = -4.9 0.7 au for the positron-argon system. That value is in excellent agreement with the relativistic polarized orbital optical potential approach result of Jones et al (a = -4.7 au) and our CCC result of a = -4.3 au.",

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AU - Zecca, Antonio

AU - Chiari, Luca

AU - Trainotti, E

AU - Fursa, D

AU - Bray, I

AU - Sarkar, Anindya

AU - Chattopadhyay, S

AU - Ratnavelu, K

AU - Brunger, Michael

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N2 - We report results from new positron-argon total cross-section (TCS) measurements. Agreement with the corresponding recent data of Jones et al (2011 Phys. Rev. A 83 032701) is found to be very good, except at the lowest energies of common measurement. Excellent qualitative agreement is also found between our measurements and an improved convergent close-coupling (CCC) calculation which was undertaken as a part of this study. This level of accord between our experimental and theoretical TCSs has enabled us to determine an experimental scattering length (a) of a = -4.9 0.7 au for the positron-argon system. That value is in excellent agreement with the relativistic polarized orbital optical potential approach result of Jones et al (a = -4.7 au) and our CCC result of a = -4.3 au.

AB - We report results from new positron-argon total cross-section (TCS) measurements. Agreement with the corresponding recent data of Jones et al (2011 Phys. Rev. A 83 032701) is found to be very good, except at the lowest energies of common measurement. Excellent qualitative agreement is also found between our measurements and an improved convergent close-coupling (CCC) calculation which was undertaken as a part of this study. This level of accord between our experimental and theoretical TCSs has enabled us to determine an experimental scattering length (a) of a = -4.9 0.7 au for the positron-argon system. That value is in excellent agreement with the relativistic polarized orbital optical potential approach result of Jones et al (a = -4.7 au) and our CCC result of a = -4.3 au.

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Positron scattering from argon: total cross sections and the scattering length

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