Kinematically complete experiments for positron-impact ionization of helium atoms at the NEPOMUC facility

T. Pflüger; M. Holzwarth; A. Senftleben; X. Ren; A. Dorn; J. Ullrich; L. R. Hargreaves; B. Lohmann; D. S. Slaughter; J. P. Sullivan; J. C. Lower; S. J. Buckman

doi:10.1088/1742-6596/262/1/012047

Kinematically complete experiments for positron-impact ionization of helium atoms at the NEPOMUC facility

T. Pflüger^*, M. Holzwarth, A. Senftleben, X. Ren, A. Dorn, J. Ullrich, L. R. Hargreaves, B. Lohmann, D. S. Slaughter, J. P. Sullivan, J. C. Lower, S. J. Buckman

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Positron impact ionization of helium is studied with fully resolved momentum vectors of all continuum particles. An imaging multi-particle momentum spectrometer (reaction microscope) detecting all final state particles over the full solid angle was applied. This apparatus was connected to the NEPOMUC facility delivering intense positron beams tuneable over a large energy range with good beam quality. At 80 eV impact energy about 5000 triple coincidence events were collected. Cross sections as function of the longitudinal particle momentum show strong differences compared to respective electron impact ionization data most likely originating from the reversed post collision interaction in both cases. Calculations using the 3 Coulomb wavefunction method show clear discrepancies from the experimental results.

Original language	English
Article number	012047
Journal	Journal of Physics: Conference Series
Volume	262
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/262/1/012047
Publication status	Published - 2011

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Pflüger, T., Holzwarth, M., Senftleben, A., Ren, X., Dorn, A., Ullrich, J., Hargreaves, L. R., Lohmann, B., Slaughter, D. S., Sullivan, J. P., Lower, J. C., & Buckman, S. J. (2011). Kinematically complete experiments for positron-impact ionization of helium atoms at the NEPOMUC facility. Journal of Physics: Conference Series, 262(1), Article 012047. https://doi.org/10.1088/1742-6596/262/1/012047

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abstract = "Positron impact ionization of helium is studied with fully resolved momentum vectors of all continuum particles. An imaging multi-particle momentum spectrometer (reaction microscope) detecting all final state particles over the full solid angle was applied. This apparatus was connected to the NEPOMUC facility delivering intense positron beams tuneable over a large energy range with good beam quality. At 80 eV impact energy about 5000 triple coincidence events were collected. Cross sections as function of the longitudinal particle momentum show strong differences compared to respective electron impact ionization data most likely originating from the reversed post collision interaction in both cases. Calculations using the 3 Coulomb wavefunction method show clear discrepancies from the experimental results.",

author = "T. Pfl{\"u}ger and M. Holzwarth and A. Senftleben and X. Ren and A. Dorn and J. Ullrich and Hargreaves, {L. R.} and B. Lohmann and Slaughter, {D. S.} and Sullivan, {J. P.} and Lower, {J. C.} and Buckman, {S. J.}",

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Pflüger, T, Holzwarth, M, Senftleben, A, Ren, X, Dorn, A, Ullrich, J, Hargreaves, LR, Lohmann, B, Slaughter, DS, Sullivan, JP, Lower, JC & Buckman, SJ 2011, 'Kinematically complete experiments for positron-impact ionization of helium atoms at the NEPOMUC facility', Journal of Physics: Conference Series, vol. 262, no. 1, 012047. https://doi.org/10.1088/1742-6596/262/1/012047

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T1 - Kinematically complete experiments for positron-impact ionization of helium atoms at the NEPOMUC facility

AU - Pflüger, T.

AU - Holzwarth, M.

AU - Senftleben, A.

AU - Ren, X.

AU - Dorn, A.

AU - Ullrich, J.

AU - Hargreaves, L. R.

AU - Lohmann, B.

AU - Slaughter, D. S.

AU - Sullivan, J. P.

AU - Lower, J. C.

AU - Buckman, S. J.

PY - 2011

Y1 - 2011

N2 - Positron impact ionization of helium is studied with fully resolved momentum vectors of all continuum particles. An imaging multi-particle momentum spectrometer (reaction microscope) detecting all final state particles over the full solid angle was applied. This apparatus was connected to the NEPOMUC facility delivering intense positron beams tuneable over a large energy range with good beam quality. At 80 eV impact energy about 5000 triple coincidence events were collected. Cross sections as function of the longitudinal particle momentum show strong differences compared to respective electron impact ionization data most likely originating from the reversed post collision interaction in both cases. Calculations using the 3 Coulomb wavefunction method show clear discrepancies from the experimental results.

AB - Positron impact ionization of helium is studied with fully resolved momentum vectors of all continuum particles. An imaging multi-particle momentum spectrometer (reaction microscope) detecting all final state particles over the full solid angle was applied. This apparatus was connected to the NEPOMUC facility delivering intense positron beams tuneable over a large energy range with good beam quality. At 80 eV impact energy about 5000 triple coincidence events were collected. Cross sections as function of the longitudinal particle momentum show strong differences compared to respective electron impact ionization data most likely originating from the reversed post collision interaction in both cases. Calculations using the 3 Coulomb wavefunction method show clear discrepancies from the experimental results.

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DO - 10.1088/1742-6596/262/1/012047

M3 - Article

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SN - 1742-6588

VL - 262

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - 1

M1 - 012047

ER -

Kinematically complete experiments for positron-impact ionization of helium atoms at the NEPOMUC facility

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