A search for Wigner cusps and resonances in positron scattering by atoms and molecules

P. Caradonna; C. Makochekanwa; A. Jones; J. R. MacHacek; J. P. Sullivan; S. J. Buckman

doi:10.1088/1742-6596/388/7/072012

A search for Wigner cusps and resonances in positron scattering by atoms and molecules

P. Caradonna^*, C. Makochekanwa, A. Jones, J. R. MacHacek, J. P. Sullivan, S. J. Buckman

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

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Abstract

Detailed elastic cross-section measurements in the vicinity of the positronium (Ps) formation threshold for He, Ne, Ar, Kr and Xe show a cusp-like feature, made visible by a small and localised depression of between (2 to 15%) of the cross-section value. Other near-threshold structures such as scattering resonances have been demonstrated in close-coupling and convergent-close- coupling calculations for helium. This investigation is undertaken to explicitly search for the presence or otherwise of scattering structures using a high efficiency (∼ 1 % statistical uncertainty) and high resolution (< 70 meV) transmission based apparatus.

Original language	English
Article number	072012
Journal	Journal of Physics: Conference Series
Volume	388
Issue number	PART 7
DOIs	https://doi.org/10.1088/1742-6596/388/7/072012
Publication status	Published - 2012
Event	27th International Conference on Photonic, Electronic and Atomic Collisions, ICPEAC 2011 - Belfast, United Kingdom Duration: 27 Jul 2011 → 2 Aug 2011

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title = "A search for Wigner cusps and resonances in positron scattering by atoms and molecules",

abstract = "Detailed elastic cross-section measurements in the vicinity of the positronium (Ps) formation threshold for He, Ne, Ar, Kr and Xe show a cusp-like feature, made visible by a small and localised depression of between (2 to 15%) of the cross-section value. Other near-threshold structures such as scattering resonances have been demonstrated in close-coupling and convergent-close- coupling calculations for helium. This investigation is undertaken to explicitly search for the presence or otherwise of scattering structures using a high efficiency (∼ 1 % statistical uncertainty) and high resolution (< 70 meV) transmission based apparatus.",

author = "P. Caradonna and C. Makochekanwa and A. Jones and MacHacek, {J. R.} and Sullivan, {J. P.} and Buckman, {S. J.}",

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doi = "10.1088/1742-6596/388/7/072012",

language = "English",

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journal = "Journal of Physics: Conference Series",

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T1 - A search for Wigner cusps and resonances in positron scattering by atoms and molecules

AU - Caradonna, P.

AU - Makochekanwa, C.

AU - Jones, A.

AU - MacHacek, J. R.

AU - Sullivan, J. P.

AU - Buckman, S. J.

PY - 2012

Y1 - 2012

N2 - Detailed elastic cross-section measurements in the vicinity of the positronium (Ps) formation threshold for He, Ne, Ar, Kr and Xe show a cusp-like feature, made visible by a small and localised depression of between (2 to 15%) of the cross-section value. Other near-threshold structures such as scattering resonances have been demonstrated in close-coupling and convergent-close- coupling calculations for helium. This investigation is undertaken to explicitly search for the presence or otherwise of scattering structures using a high efficiency (∼ 1 % statistical uncertainty) and high resolution (< 70 meV) transmission based apparatus.

AB - Detailed elastic cross-section measurements in the vicinity of the positronium (Ps) formation threshold for He, Ne, Ar, Kr and Xe show a cusp-like feature, made visible by a small and localised depression of between (2 to 15%) of the cross-section value. Other near-threshold structures such as scattering resonances have been demonstrated in close-coupling and convergent-close- coupling calculations for helium. This investigation is undertaken to explicitly search for the presence or otherwise of scattering structures using a high efficiency (∼ 1 % statistical uncertainty) and high resolution (< 70 meV) transmission based apparatus.

UR - http://www.scopus.com/inward/record.url?scp=84870623356&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/388/7/072012

DO - 10.1088/1742-6596/388/7/072012

M3 - Conference article

AN - SCOPUS:84870623356

SN - 1742-6588

VL - 388

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - PART 7

M1 - 072012

T2 - 27th International Conference on Photonic, Electronic and Atomic Collisions, ICPEAC 2011

Y2 - 27 July 2011 through 2 August 2011

ER -

A search for Wigner cusps and resonances in positron scattering by atoms and molecules

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