Suche nach tiefgebundenen Zustaenden im Antiproton-Proton-System

Recently experimental evidence has appeared for the existence of resonances above the NantiN-threshold. In particular it is noticable that some of these states are extremely narrow (< 4 MeV). Below the NantiN-threshold such states are best detectable by measuring the transitions between the atomic and the quasinuclear states of the anti pp-system via emission of a γ-quant. In this work the first results of such measurements are presented. The spectra of high-energetic γ-rays following the anti pp-and pHe-annihilation are investigated. There is evidence for the existence of three such states at 1684, 1646, and 1395 MeV in the anti pp-system.