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This report reviews the achievements of the Crystal Barrel experiment at theLow Energy Antiproton Ring (LEAR) at CERN. During seven years of operationCrystal Barrel has collected very large statistical samples in pbarpannihilation, especially at rest and with emphasis on final states with highneutral multiplicity. The measured rates for annihilation into various two-bodychannels and for electromagnetic processes have been used to test simple modelsfor the annihilation mechanism based on the quark internal structure ofhadrons. From three-body annihilations three scalar mesons, a0(1450), f0(1370)and f0(1500) have been established in various decay modes. One of them,f0(1500), may be identified with the expected ground state scalar glueball.

Proton-antiproton annihilation and meson spectroscopy with the Crystal Barrel