Title
| ˉH+ production from collisions between positronium and keV antiprotons for GBAR |
Author(s)
| Comini, Pauline (IRFU, SPP, Saclay) ; Hervieux, Paul-Antoine (IPCMS, Strasbourg) ; Biraben, Francois (Paris, Lab. Kastler Brossel) |
Publication
| 2014 |
Number of pages
| 7 |
In:
| Hyperfine Interact. 228 (2014) 159-165 |
In:
| 11th International Conference on Low Energy Antiproton Physics, Uppsala, Sweden, 10 - 15 Jun 2013, pp.159-165 |
DOI
| 10.1007/s10751-014-1030-y
|
Subject category
| Nuclear Physics - Experiment ; General Relativity and Cosmology |
Accelerator/Facility, Experiment
| CERN AD ; GBAR AD-7 |
Abstract
| In the framework of the GBAR (Gravitational Behaviour of Antihydrogen at Rest) experiment, cross sections for antihydrogen ion ( ˉH+ ) production in collisions between antiprotons ( ˉp ) and excited positronium atoms (Ps), with intermediate production of antihydrogen ( ˉH ), have been computed using a perturbative theory, namely Continuum Distorted Wave - Final State (CDW-FS). The results suggest to use antiprotons at 1, 2 or 6 keV with, respectively, Ps(3p,3d), Ps(2p) or no Ps excitation. A simulation using these cross sections is under development to investigate the reaction chamber geometry and the parameters of the different beams (positrons, antiprotons and laser). This simulation, focusing on Ps(3d), predicts at least one ˉH+ ion per pulse of 3·106 ˉp at 1 and 6 keV, and highlights both the interest of positronium excitation and the need for short pulses of particles. |