Osnabrück 2002 – wissenschaftliches Programm
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A: Atomphysik
A 4: Atomstösse
A 4.3: Vortrag
Dienstag, 5. März 2002, 14:30–14:45, HS 01/E02
Cq+ - Cs collisions studied with a laser-cooled target — •B. Eike, J. Kleinert, U. Eisenbarth, S. Hannemann, R. Grimm*, D. Schwalm, V. P. Shevelko**, and M. Weidemüller — Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany
We present investigations of collisional processes using ultracold
atoms as a target inside the Heidelberg Test Storage Ring [1]. Cesium
atoms
are confined in a magneto-optical trap at a temperature below
100 µK. The position of the atom cloud (dia. 100 µm) can be
controlled horizontally and vertically by static magnetic fields over
a range of 20 mm. The interaction of the ion beam with the
cold target is monitored by measuring the loss rate of trapped atoms.
The total cross section for trap-loss collisions between cesium
atoms and highly charged carbon ions Cq+ (q = 3 - 6) at
energies of ∼ 2 MeV × q2 is determined. The results
are compared to theoretical calculations which indicate that the major
contribution to the cross section is the ionization of the target
rather than electron capture.
* Institut für Experimentalphysik,
Universität Innsbruck, Austria.
** P. N. Lebedev Physical Institute,
Moscow, Russia.
[1] B. Eike et al., NIM A 441 (2000) 81.