INTERNAL PAIR DECAY OF GIANT-RESONANCES IN HOT PB-200

Electron-positron pairs emitted during the de-excitation of hot Pb-200 from the reaction 95 MeV F-19 + Ta-181 were detected with the Stony B rook pair detector. The internal pair decay from the giant dipole reso nance (GDR) built on excited states in a heavy nucleus is cleanly obse rved for the first time. The results show that the GDR dominates the p air decay from a hot, heavy nucleus. Superior statistics is needed in order to extract weaker modes like the monopole or quadrupole giant re sonances. Attempts to extract EO pair transitions by use of kinematic cuts and by dividing out the GDR pair strength are presented.