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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 (π-, μ-, p , K-, Σ-, ...) 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 (π-14 N) on the one hand in order to determine the pion mass with high accuracy (4 ppm) and on the other hand in antiprotonic atoms ( pp) 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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  • HAL Id : tel-00011776, version 1

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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-00011776⟩

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