Speaker
Description
The region of $N=40$, below the Ni isotopes, is now well-established as a region of deformed ground-states and nuclear collectivity. While the body of spectroscopic information in the so-called N=40 Island of Inversion, centered around $^{64}$Cr, is growing, its boundaries remain undefined, particularly moving from neutron number 40 toward $N=50$. In addition, quantities which more directly provide insight into the wavefunctions in this region, such as B(E2), have only been measured up to $^{68}$Fe. Such quantities provide important benchmarks for theory, both large-scale shell model effective interactions (e.g. LNPS) and ab-initio calculations which are now reaching into this region (e.g. IM-VSRG). We will present preliminary results for an intermediate energy Coulomb excitation measurement performed on neutron-rich $^{70}$Fe ($N=44$) using GRETINA at FRIB. The first direct measurement of the reduced transition probability from the $0^+$ ground state to the first $2^+$ excited state is a useful validation for shell model calculations as we move from the $N=40$ Island of Inversion toward $N=50$.
| Contribution category | Experiment |
|---|---|
| Presenter status | Student |