Article Dans Une Revue Journal of Physics: Conference Series Année : 2013

H̄ and H̄+production cross sections for the GBAR experiment

Résumé

The production and cooling of the bar H+ ion is the key point of the GBAR experiment (Gravitational Behaviour of Antihydrogen at Rest), which aims at performing the free fall of antihydrogen atoms to measure bar g, the acceleration of antimatter on Earth. bar H+ ions will be obtained from collisions between a positronium cloud and antiprotons delivered by the AD/ELENA facility at CERN, with intermediate formation of antihydrogen atoms. In order to optimise the experimental production of bar H+ ions, we computed the total cross sections of the two corresponding reactions, within the same theoretical framework of the Continuum Distorted Wave – Final State (CDW-FS) model. The different contributions of the bar H excited states have been systematically investigated for different states of Ps. The results exhibit an increase of the bar H production toward low kinetic energies, in agreement with experimental data and previous calculations, whereas the largest bar H+ production is obtained with low energy ground-state antihydrogen atoms. These theoretical predictions suggest that the overall production of bar H+ could be optimal for 2 keV antiproton impact energy, using positronium atoms prepared in the 2p state.

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hal-04780804 , version 1 (13-11-2024)

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P Comini, Paul-Antoine Hervieux. H̄ and H̄+production cross sections for the GBAR experiment. Journal of Physics: Conference Series, 2013, 443, pp.012007. ⟨10.1088/1742-6596/443/1/012007⟩. ⟨hal-04780804⟩
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