PICOSECOND LIFETIME MEASUREMENT SYSTEMS FOR LEVELS POPULATED BY ELECTRON-CAPTURE AND FOR LEVELS DECAYING BY E0 TRANSITIONS

Two new systems, to measure lifetimes of nuclear levels in the picosecond range that decay by E0 transitions, have been developed at the UNISOR on-line isotope separator facility. These systems make use, for the first time, of fast coincidences involving characteristic X-rays. The first of the two systems involves specifically the X-rays originating from the internal conversion process, while the second involves X-rays resulting from both the internal conversion and electron capture processes.