Evidence for a resonance in positron-electron scattering at 810 keV centre-of-mass Energy

K. Maier, E. Widmann, W. Bauer, F. Bosch, J. Briggmann, H. D. Carstanjen, W. Decker, J. Diehl, R. Feldmann, B. Keyerleber, D. Maden, J. Major, H. E. Schaefer, A. Seeger, H. Stoll

Research output: Contribution to journalArticle

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Abstract

A monoenergetic positron (e+) beam (ΔT/T-4) from the Stuttgart pelletron accelerator and a 4.6 mg/cm2 Be target has been employed to investigate e+e-scattering in the MeV region in a large solid angle with high statistics by means of a novel positionsensitive detector system. Superimposed on the Bhabha scattering, a structure has been found at an e+ kinetic energy of 2263 keV (810 keV excitation energy in the e+e-rest frame). From the energy-integrated resonance cross-section of {Mathematical expression} ≅30 b·eV (c.m.) and the standard resonance cross-section we estimate partial resonance widths {Mathematical expression} ≅72 meV or 24 meV for total angular momenta J=0 or J=1, respectively. The structure, which has not been predicted within the framework of quantum electrodynamics, coincides with one of the sum energies of the correlated e+e-lines observed in heavy-ion collisions.

Original languageEnglish
Pages (from-to)173-181
Number of pages9
JournalZeitschrift für Physik A Atomic Nuclei
Volume330
Issue number2
DOIs
Publication statusPublished - Jun 1988

Fingerprint

center of mass
positrons
electron scattering
cross sections
quantum electrodynamics
scattering
ionic collisions
energy
accelerators
angular momentum
kinetic energy
statistics
detectors
estimates
excitation

Keywords

  • 12.20.Fv
  • 13.10.+q
  • 14.80.Pb

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Maier, K., Widmann, E., Bauer, W., Bosch, F., Briggmann, J., Carstanjen, H. D., ... Stoll, H. (1988). Evidence for a resonance in positron-electron scattering at 810 keV centre-of-mass Energy. Zeitschrift für Physik A Atomic Nuclei, 330(2), 173-181. https://doi.org/10.1007/BF01293393

Evidence for a resonance in positron-electron scattering at 810 keV centre-of-mass Energy. / Maier, K.; Widmann, E.; Bauer, W.; Bosch, F.; Briggmann, J.; Carstanjen, H. D.; Decker, W.; Diehl, J.; Feldmann, R.; Keyerleber, B.; Maden, D.; Major, J.; Schaefer, H. E.; Seeger, A.; Stoll, H.

In: Zeitschrift für Physik A Atomic Nuclei, Vol. 330, No. 2, 06.1988, p. 173-181.

Research output: Contribution to journalArticle

Maier, K, Widmann, E, Bauer, W, Bosch, F, Briggmann, J, Carstanjen, HD, Decker, W, Diehl, J, Feldmann, R, Keyerleber, B, Maden, D, Major, J, Schaefer, HE, Seeger, A & Stoll, H 1988, 'Evidence for a resonance in positron-electron scattering at 810 keV centre-of-mass Energy', Zeitschrift für Physik A Atomic Nuclei, vol. 330, no. 2, pp. 173-181. https://doi.org/10.1007/BF01293393
Maier, K. ; Widmann, E. ; Bauer, W. ; Bosch, F. ; Briggmann, J. ; Carstanjen, H. D. ; Decker, W. ; Diehl, J. ; Feldmann, R. ; Keyerleber, B. ; Maden, D. ; Major, J. ; Schaefer, H. E. ; Seeger, A. ; Stoll, H. / Evidence for a resonance in positron-electron scattering at 810 keV centre-of-mass Energy. In: Zeitschrift für Physik A Atomic Nuclei. 1988 ; Vol. 330, No. 2. pp. 173-181.
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AU - Keyerleber, B.

AU - Maden, D.

AU - Major, J.

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AU - Seeger, A.

AU - Stoll, H.

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