Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 37: Nuclear Structure/Spectroscopy VI

HK 37.2: Group Report

Thursday, March 11, 2004, 14:00–14:30, A

Study of Anti-hydrogen production at ATRAP — •D. Grzonka — Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich

The ATRAP experiment at the CERN antiproton decelerator AD aims for a test of the CPT invariance by a comparison of the hydrogen to anti-hydrogen atom spectroscopy. To achieve the required high precision in the measurements of atomic transitions cold atoms of anti-hydrogen are essential. Trapped neutral anti-hydrogen atoms, up to now not available, have to be used.

The anti-hydrogen production via 3-body recombination routinely operated at ATRAP [1,2] is studied in more detail in order to characterize this production mechanism in view of future trapping of neutral anti-hydrogen atoms. Shape parameters of the antiproton and positron clouds and the anti-hydrogen production probability as a function of relevant parameters have been measured. The N-state distribution of the produced Rydberg anti-hydrogen was analyzed and first measurements of the anti-hydrogen velocity have been performed. Furthermore an alternative production mechanism via double charge exchange has been studied [3]. The results achieved in 2003 and further steps towards the trapping of anti-hydrogen atoms will be discussed.

[1] G. Gabrielse et al., Phys. Rev. Lett. 89, 213401 on line (2002).

[2] G. Gabrielse et al., Phys. Rev. Lett. 89, 233401 (2002).

[3] E. A. Hessels et al., Phys. Rev. A 57, 1668 (1998).