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Theses

Spectroscopie X de Précision sur les Ions Lourds Multichargés et les Atomes Exotiques

Abstract : In this thesis, we present four experiments designed to study hydrogenlike and heliumlike heavy ions, or exotic atoms. These experiments have been run at the Gesellschaft für Scherionenforchung (GSI) and the Paul Scherrer Institut (PSI).

In the first part of this text, we begin with the description of a focusing, curved-crystal spectrometer in transmission geometry, coupled with a microstrip, germanium position-sensitive detector, which diffract X-ray photons in the range 50-100 keV. With this spectrometer, which can be mounted on the GSI accelerator, we will increase, by one order of magnitude, the accuracy on the measurement of the 1s Lamb shift in hydrogenlike uranium ions, in order to test QED in strong coulomb field. Next, we detail an experiment that will soon give a new value of the charged-pion mass with a relative accuracy of 1 ppm. For this one, we perform X-ray spectroscopy of pionic nitrogen, at PSI. The experimental set-up is made up of a cyclotron trap, a spherical Bragg-crystal focusing spectrometer, in reflection geometry, and a CCD, sensitive-position cooled detector. This set-up allows also test QCD and chiral perturbation theory by measurements of radiative transitions of pionic hydrogen.

The main subject of the second part is a lifetime measurement of a metastable state in heliumlike gold ions, by Beam Foil Spectroscopy. With this experiment, which provides an important test of relativistic many-body theory, we give, for the first time, an accurate value of the lifetime of this state for an ion with a Z larger than 64.
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https://tel.archives-ouvertes.fr/tel-00003392
Contributor : Bruno Manil <>
Submitted on : Wednesday, September 17, 2003 - 4:11:28 PM
Last modification on : Thursday, December 10, 2020 - 12:36:57 PM
Long-term archiving on: : Friday, April 2, 2010 - 6:56:17 PM

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  • HAL Id : tel-00003392, version 1

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Bruno Manil. Spectroscopie X de Précision sur les Ions Lourds Multichargés et les Atomes Exotiques. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2001. Français. ⟨tel-00003392⟩

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