DOPPLER-CORRECTED SPECTROSCOPY OF CONVERSION ELECTRONS WITH MINI-ORANGES AFTER HEAVY-ION COLLISIONS

The Doppler-deterioration of the energy resolution of conversion elect rons emitted by fast moving nuclei has been mostly compensated by appl ying event-by-event kinematic corrections. The method has been applied to the scattering of 6 MeV/u U-238 on Ta-181 with Coulomb excitation of both the scattered projectiles and the recoiling target nuclei. The direction of flight of scattered projectiles and recoiling ejectiles were observed and registered in coincidence with conversion electrons emitted from Coulomb excited states. Assuming elastic (or quasi-elasti c) scattering, the velocity of the electron-emitting nucleus and the s ubsequent shift in energy of the electron can be determined. This allo ws precise Doppler corrections for electrons emitted within a specific solid angle and observed by a system of four Multi-Orange spectromete rs.