A device for in-beam g-factor measurements for isomeric states in the range of a few hundred nanoseconds

Abstract g -factor and lifetime measurements were performed for isomeric states in the hundreds-nanoseconds range. A beam pulser was built to increase the free time range between two beam bursts. The g factors were measured using a time-differential perturbed- angular-distribution method (TDPAD). A 20 kG static magnetic field was provided by a window-frame magnet with a small leakage field. Multidimensional techniques using the ARIEL computer facilities enabled us to perform a complete analysis of the data corresponding to all delayed γ lines in the same time. This new experimental setup allowed us to derive the g factors of some isomeric states (12 + levels in neutron-deficient 194, 196, 198 Pb) and obtain accurate corresponding lifetimes.