Observation of the large-scale sidereal anisotropy of the galactic cosmic ray intensity at 300 TeV with the Tibet Air Shower Array

The $\ensuremath{\beta}$ decay and $\ensuremath{\beta}$-delayed neutron emission of $^{102}\mathrm{Rb}$ have been studied using the $8\ensuremath{\pi}$ spectrometer at TRIUMF-ISAC. The level scheme of $^{102}\mathrm{Sr}$ has been expanded from results of a $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coincidence analysis, including the identification of the $({4}^{+})$ member of the ground-state band. The $\ensuremath{\beta}$-delayed neutron branching ratio of $^{102}\mathrm{Rb}$ was found to be significantly larger than previously reported. This larger value has the potential to modify the results of $r$-process calculations and motivates further measurements as well as refinements of theoretical models.