Recombination of U89+ ions with free electrons at the ESR

After an extended upgrading period at the Experimental Storage Ring (ESR) o f the GSI in Darmstadt, an experiment on recombination of lithium-like uran ium has been carried out. A 107.1 MeV/u U89+ beam with up to 500 mu A effec tive current was stored and cooled. In addition to measurements of radiativ e recombination (RR) and dielectronic recombination (DR) with high energy r esolution in the range of 0-90 eV, the diagnostic properties of DR have bee n utilized to characterize the new cooler setup. Preliminary experimental r esults for the 1s(2)2P(3)/(2)5l(j) (j = 3/2, 5/2) resonance manifolds are p resented and compared with theoretical predictions.