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[en] Antiprotonic atoms, in which an orbiting electron of a normal atom is replaced by an antiproton, are the latest exotic atoms to be discovered. After a short introduction to the essentials of exotic atoms the properties of antiprotonic atoms, their production and detection are discussed. This includes remarks on novel schemes to produce and detect antiprotonic X-rays and to determine the levels of these atoms as well as on the revolutionary progress due to the antiproton source LEAR, from which a major part of the new results in this article are obtained. Very different fields in physics benefit from these studies. They range from studies of atomic cascades, which are more difficult with lighter orbiting particles, to investigations of the p-bar-nucleus interaction bearing on nuclear structure as well as on the elementary p-barp and p-barn interactions. Last but not least the most precise data on the properties of the antiproton itself are derived from antiprotonic X-ray spectra. The study of the fundamental p-barH system discussed at the end can be taken as a good example of recent progress. (author)

[en] Polarization observables for the reaction p-bar +p->e⁺+e^- are given in terms of three independent complex amplitudes, in presence of two photon exchange. General expressions for the differential cross section and the polarization observables are given and model independent properties are derived. Polarization effects depending on the polarization of the antiproton beam, the target and of the electron in the final state, have been calculated

[en] We report on the performance and planned upgrades to the Fermilab Accumulator Stacktail Stochastic Cooling System. The current system has achieved a maximum flux of 16.5e10/hour, limited by the input flux of antiprotons. The upgrades are designed to handle flux in excess of 40e10/hour

[en] The Fermilab Recycler Ring (permanent magnets) will be built on top of the Fermilab Main Injector sharing the same tunnel; its main function is to recycle the anti-protons after a store in the Tevatron and to provide storage for them after after accumulation and cooling in the Accumulator. Estimates of coupling impedances show domination by space charge. Examination of longitudinal instabilities shows that microwave instability will not occur if there are only N = 2.53 x 10¹² anti-protons in the beam. Longitudinal coupling-bunch instability during injection stacking does not appear possible because of long bunch lengths/short bunch gaps and lack of sharp resonances. Transverse instability, on the other hand, cannot be Landau damped by the momentum spread in the beam, but it can be cured by a small spread in the betatron tunes (either from space charge or an octupole)

[en] The approved FAIR upgrade of the GSI facility in Darmstadt, Germany, includes the construction of a High Energy Storage Ring (HESR) for high intensity, phase space cooled antiprotons with momenta up to 15 GeV/c. A wide physics program is planned at this facility to investigate fundamental questions of hadron and nuclear physics in interactions of antiprotons with nucleons and nuclei. To serve the many experiments planned at this new facility, an universal, modular, hermetic spectrometer called PANDA (Proton ANtiproton Detector Array) is planned. This talk presents an overview of the physics program pursued by this project and of the PANDA detector system. The feasibility of measurements in the sector of spin degrees of freedom of quarks will be also discussed. (author)

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[en] The PANDA experiment represents the central part of the hadron physics branch of the antiproton program of the new Facility for Antiproton and Ion Research (FAIR) at Darmstadt, Germany. It will investigate antiproton annihilations with almost 4π acceptance from two subsequent spectrometers in the momentum range from 1.5 GeV/c to 15 GeV/c. The gluon rich reaction product of antiproton-proton and antiproton-nucleus collisions on one hand and the high intensity and phase space cooled antiproton beam of the HESR on the other hand constitutes an ideal environment to study non-conventional hadronic states. It allows the high precision spectroscopy of the charmonium system and the copious production of hypernuclei.

No abstract available