Abstract

The development of a Ring Imaging CHerenkov (RICH) detector working in an environment of strong hadronic background is needed for the High Acceptance Di-Electron Spectrometer (HADES). To get information about the charged particle background situation, a CERN RICH prototype with solid (CsI) photocathode was tested in a 1×A GeV U+Pb reaction at GSI. Also the quantum efficiency of the CsI photocathode was determined to be 10% at 175 nm.

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