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Tests d'Électrodynamique Quantique et Étalons de Rayons-X à l'Aide des Atomes Pioniques et des Ions Multichargés

Abstract : The object of this thesis is to present a new measurement of the pion mass using pionic nitrogen X-ray spectroscopy and results on helium-like argon and sulphur spectroscopy. The new pion mass has been measured with an accuracy of 1.7 ppm, 30% better that the present world average value, and it is obtained from Bragg spectroscopy of 5 -> 4 pionic nitrogen transitions using the theoretical predictions provided by QED. I present the calculation of the hyperfine structure and recoil corrections for pionic atoms using a new perturbation method for the Klein-Gordon equation. The spectrometer used for this measurement has been characterized with the relativistic M1 transitions from he-like ions produced with a new device, the Electron-Cyclotron-Resonance Ion Trap. High statistics spectra from these ions enable to measure transition energies with a precision of some ppm that allows to compare theoretical predictions with experiment. X-ray emission from pionic atoms and multicharged ions can be used to define new types of X-ray standards for energies of a few keV.
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https://tel.archives-ouvertes.fr/tel-00067768
Contributor : Martino Trassinelli <>
Submitted on : Monday, August 10, 2009 - 10:25:00 AM
Last modification on : Thursday, December 10, 2020 - 12:39:01 PM
Long-term archiving on: : Saturday, November 26, 2016 - 11:12:26 AM

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  • HAL Id : tel-00067768, version 2

Citation

Martino Trassinelli. Tests d'Électrodynamique Quantique et Étalons de Rayons-X à l'Aide des Atomes Pioniques et des Ions Multichargés. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00067768v2⟩

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