Speaker
Description
Electromagnetic transition rates are recognized as observables critical for evaluation of nuclear structure effects and verification of nuclear models. Doppler-shift lifetime measurements in inverse kinematics provide an opportunity to directly access information about electromagnetic transition rates in a way which is fully independent on the reaction mechanism. As such, Recoil Distance and related Doppler Shift Attenuation Methods (RDM and DSAM), when implemented at stable and/or radioactive beam facilities, hold the promise of reaching far from stability and providing lifetime information for intermediate-spin excited states in a wide range of nuclei. In response to opportunities opened by availability of re-accelerated beams at ISAC-II (TRIUMF), a plunger-type recoil distance method device, the TIGRESS Integrated Plunger (TIP), has been constructed at Simon Fraser University to be used with the TIGRESS segmented Germanium array. The plunger is designed to achieve control of sub-micrometer shifts between target and degrader and can be run in a self-standing mode or in tandem with auxiliary charged particle detectors for reaction channel selection. A compact CsI array with digital readout has been developed as a part of the TIP program and used in spectroscopy, DSAM, and RDM experiments employing fusion-evaporation reactions. TIP is also designed to be coupled with TIGRESS and the electromagnetic spectrometer EMMA. A summary of the experimental program and examples of RDM and DSAM measurements following fusion-evaporation, neutron transfer, and Coulomb excitation reactions will be presented and discussed.
| Contribution category | Experiment |
|---|---|
| Presenter status | Faculty/Staff |