New levels and $\gamma$-rays in $^{164}$Gd

Levels in $^{164}$Gd were populated by two separate experiments: spontaneous fission of $^{252}$Cf and $\beta$-decay of $^{164}$Er. The $^{164}$Er was produced by uranium fission, and transported via tape collector through the LeRIBSS station at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The data were taken by four Clover HPGe $\gamma$-ray detectors, and two plastic scintillating $\beta$ detectors. This setup allows for $\gamma-\gamma$ and $\gamma-\gamma-\beta$ coincidence measurements. The other experiment consisted of placing a 62 $\mu$Ci source of $^{252}$Cf in the center of the GAMMASPHERE detector array for four weeks producing $5.7\times10^{11}$ $\gamma-\gamma-\gamma$ and higher coincidence events, with $1.9\times10^{11}$ of them being $\gamma-\gamma-\gamma-\gamma$ coincidence or higher. These two data sets were used to analyze the level scheme structure of $^{164}$Gd, uncovering new levels and $\gamma$'s.