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Spectroscopie de Précision des Atomes Pioniques et Antiprotoniques

Abstract : The study of exotic atoms, in which an orbiting electron of a normal atom is replaced by a negatively charged particle may provide information on the orbiting particle and the atomic nucleus, as well as on their interaction.

In this work, we were interested in pionic atoms on the one hand in order to determine the pion mass with high accuracy (4 ppm), and on the other hand in antiprotonic atoms in order to study the strong nucleon-antinucleon interaction at threshold. In this respect, a high-resolution crystal spectrometer was coupled to a cyclotron trap which provides a high stop density for particles in gas targets at low pressure. Using curved crystals, an extended X-ray source could be imaged onto the detector. Charge-Coupled Devices were used as position sensitive detectors in order to mesure the Bragg angle of the transition to a high precision.

The use of gas targets resolved the ambiguity owing to the number of K electrons for the value of the pion mass, and, for the first time, strong interaction shift and broadening of the 2p level in antiprotonic hydrogen were measured directly.
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Contributor : Pascal El-Khoury <>
Submitted on : Friday, February 10, 2006 - 6:08:08 PM
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  • HAL Id : tel-00011580, version 2


Pascal El-Khoury. Spectroscopie de Précision des Atomes Pioniques et Antiprotoniques. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1998. Français. ⟨tel-00011580v2⟩



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