Speaker
Description
The study of nuclear moments of short-lived excited states – spanning lifetimes from the microsecond to the picosecond range – relies on the observation of the nuclear spin precession in external electromagnetic fields. Such measurements are performed through time-dependent monitoring of the angular distribution of emitted gamma rays, detected using high-resolution germanium or fast scintillator detector systems.
This contribution will present a concise overview of current experimental approaches, including:
i) Time Dependent Perturbed Angular Distribution (TDPAD) for microsecond isomers produced in projectile-fragmentation reactions; ii) Time Dependent Recoil In Vacuum (TDRIV) for picosecond states; and iii) Time Dependent Perturbed Angular Correlation (TDPAC), a technique expected to be able to cover the intermediate lifetime range – from a few hundred nanoseconds down to ~1 ns – with applicability at both fragmentation and ISOL facilities.
Some highlights from studies in the $^{68}Ni$ region (MSU), the $^{132}Sn$ region (RIBF, RIKEN), and the $^{208}Pb$ region (IFIN-HH) will be presented. The prospects for implementing TDPAC in future ISOL-based nuclear-moment investigations will be discussed.