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HK: Physik der Hadronen und Kerne
HK 6: Physik mit schweren Ionen I
HK 6.6: Group Report
Monday, March 19, 2001, 18:00–18:30, E
First Results from the e+e− Pair Spectrometer HADES∗ — •Roman Gernhäuser — Technische Universität München, James-Franck-Strasse 1, D-85748 Garching
The new High Acceptance DiElectron Spectrometer HADES is desiged for the study of hadron properties inside the nuclear medium and is presently setup at GSI, Darmstadt. During 2000 the installation phase of HADES continued and most of the detector systems were completed. The actual setup allows for particle identification and momentum measurement with moderate resolution inside the full acceptance. The installed detector modules with their read out electronics, the new trigger and data acquisition system, and the new analysis package HYDRA have been commissioned and successfully operated in a beam time run with 1.5 A·GeV carbon projectiles impinging on a carbon target of 1% interaction length. About 107 non-peripheral collisions were recorded, including about 105 events with lepton candidates and roughly 103 e+e− pairs. We will summarize the actual status of the spectrometer, report the measured detector performances, and present first results from the ongoing data analysis. We will also give a short overview of first experiments with carbon and pion beams planned for the near future. ∗ supported by BMBF (6TM970I) and GSI (TM-FR1).