$\beta$-decay study of neutron-rich $^{102}$Rb at TRIUMF-ISAC

Experimental investigations of the $\beta$-decay properties of nuclei which lie along the astrophysical r-process are becoming possible with modern facilities and detection systems. In this experiment, a $^{102}$Rb beam was produced by 500 MeV, 10 $\mu$A protons impinging on a multilayer UC$_x$ target at TRIUMF-ISAC Facility. The beam of $^{102}$Rb ions was implanted on a movable tape at the center of the 8$\pi$ spectrometer. The 20 HPGe 8$\pi$ $\gamma$-ray detectors were coupled with SCEPTAR, an hemispherical array of scintillators for $\beta$-tagging and DANTE, an array of five LaBr$_3$ detectors for fast $\gamma$-ray timing. A preliminary analysis has allowed the first identification of the $4^+$ to $2^+$ transition in the daughter nucleus, $^{102}$Sr. A near identical low-lying band structure of $^{102}$Sr with $^{98, ~100}$Sr nuclei has been observed, indicating the rigidly deformed rotational nature continues towards to the $N=66$ midshell. The current experimental measurements of $^{102}$Rb $\beta$-decay half life as well as the $\beta$-delayed neutron emission branching ratio compared with reported values, the shorter $\beta$-decay half life and the larger $\beta$-delayed neutron emission branching ratio will locally reshape astrophysical r-process predictions.