Very low-energy total cross sections and the experimental scattering length for the positron-xenon system

Antonio Zecca; Luca Chiari; E Trainotti; Michael Brunger

doi:10.1088/0953-4075/45/8/085203

Very low-energy total cross sections and the experimental scattering length for the positron-xenon system

Antonio Zecca, Luca Chiari, E Trainotti, Michael Brunger

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26 Citations (Scopus)

Abstract

We report total cross-section (TCS) results for low-energy positron scattering from the noble gas xenon. A comparison with previous measurements shows a good level of accord with the recent results of the ANU group (2011 New J. Phys. 13 125004). Very good qualitative agreement is also found with the convergent close-coupling (CCC) calculation of Fursa and Bray (2012 New J. Phys. 14 035002) over most of the common energies. By using the shape of the CCC results as a guide, we also extrapolate our measured cross sections to very low energy. With the aid of the CCC theory, we therefore derive the first experimental estimate for the positronxenon scattering length of a =99.2 ± 18.4 au. This value is found to be consistent with the CCC-based estimate and also with those of some other theories. This result supports the existence of a positronxenon virtual state at a positron energy = (1.4 ± 0.6)×10 ³eV.

Original language	English
Article number	085203
Pages (from-to)	085203-1-085203-7
Number of pages	7
Journal	Journal of Physics B-Atomic Molecular and Optical Physics
Volume	45
Issue number	8
DOIs	https://doi.org/10.1088/0953-4075/45/8/085203
Publication status	Published - 28 Apr 2012

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title = "Very low-energy total cross sections and the experimental scattering length for the positron-xenon system",

abstract = "We report total cross-section (TCS) results for low-energy positron scattering from the noble gas xenon. A comparison with previous measurements shows a good level of accord with the recent results of the ANU group (2011 New J. Phys. 13 125004). Very good qualitative agreement is also found with the convergent close-coupling (CCC) calculation of Fursa and Bray (2012 New J. Phys. 14 035002) over most of the common energies. By using the shape of the CCC results as a guide, we also extrapolate our measured cross sections to very low energy. With the aid of the CCC theory, we therefore derive the first experimental estimate for the positronxenon scattering length of a =99.2 ± 18.4 au. This value is found to be consistent with the CCC-based estimate and also with those of some other theories. This result supports the existence of a positronxenon virtual state at a positron energy = (1.4 ± 0.6)×10 3eV.",

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T1 - Very low-energy total cross sections and the experimental scattering length for the positron-xenon system

AU - Zecca, Antonio

AU - Chiari, Luca

AU - Trainotti, E

AU - Brunger, Michael

PY - 2012/4/28

Y1 - 2012/4/28

N2 - We report total cross-section (TCS) results for low-energy positron scattering from the noble gas xenon. A comparison with previous measurements shows a good level of accord with the recent results of the ANU group (2011 New J. Phys. 13 125004). Very good qualitative agreement is also found with the convergent close-coupling (CCC) calculation of Fursa and Bray (2012 New J. Phys. 14 035002) over most of the common energies. By using the shape of the CCC results as a guide, we also extrapolate our measured cross sections to very low energy. With the aid of the CCC theory, we therefore derive the first experimental estimate for the positronxenon scattering length of a =99.2 ± 18.4 au. This value is found to be consistent with the CCC-based estimate and also with those of some other theories. This result supports the existence of a positronxenon virtual state at a positron energy = (1.4 ± 0.6)×10 3eV.

AB - We report total cross-section (TCS) results for low-energy positron scattering from the noble gas xenon. A comparison with previous measurements shows a good level of accord with the recent results of the ANU group (2011 New J. Phys. 13 125004). Very good qualitative agreement is also found with the convergent close-coupling (CCC) calculation of Fursa and Bray (2012 New J. Phys. 14 035002) over most of the common energies. By using the shape of the CCC results as a guide, we also extrapolate our measured cross sections to very low energy. With the aid of the CCC theory, we therefore derive the first experimental estimate for the positronxenon scattering length of a =99.2 ± 18.4 au. This value is found to be consistent with the CCC-based estimate and also with those of some other theories. This result supports the existence of a positronxenon virtual state at a positron energy = (1.4 ± 0.6)×10 3eV.

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Very low-energy total cross sections and the experimental scattering length for the positron-xenon system

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