Speaker
Description
A sudden ground-state shape transition is known to occur sharply at $N=60$, accompanied by equally dramatic changes in the low-energy spectra of the nuclei with A$\approx\!$100. Detailed spectroscopic data on the $\gamma$ decay of $^{100}$Zr are essential for understanding this phase transition and the emergence of shape coexistence, predicted by recent Monte Carlo Shell Model (MCSM) calculations.
Studying $^{100}$Zr via $\gamma$-ray spectroscopy following $\beta$ decay presents an experimental challenge due to the refractory nature of $^{100}$Y, which prevents its direct extraction at Isotope Separator On-Line (ISOL) facilities. To overcome this, a beam mixture of $^{100}$Rb and $^{100}$Sr was delivered to a tape in the center of the powerful Gamma Ray Infrastructure For Fundamental Investigations of Nuclei (GRIFFIN) spectrometer at the TRIUMF facility.
The use of a tape station facilitated the selective separation of short-lived activity, permitting the disentanglement of the complex $\gamma$-ray spectra. The collected $\gamma-\gamma$ coincidence data allowed for vastly extending the previously known level scheme of $^{100}$Zr and to unambiguously assign the spins of key states via $\gamma-\gamma$ angular correlations.
Selected results will be presented, including evidence for the recently found $0_4^+$ state in $^{100}$Zr, which was predicted by MCSM to possess a spherical shape. Candidates for a spin-2 member of a band presumably built on the $0_4^+$ state will be discussed. Branching and mixing ratios will be used to test the existing structural interpretations.
| Your current academic level | Postdoctoral researcher |
|---|---|
| Your email address | dkalaydj@uoguelph.ca |
| Affiliation | University of Guelph |
| Supervisor name | P. E. Garrett and C. Svensson |
| Supervisor email | garrettp@uoguelph.ca |
